How long does it take to fly to Sydney?

If you’re flying from a popular airport in Seoul, such as Incheon or Seoul, and flying into Sydney, then you can expect flight times to average 10h 15m and 14h, respectively.

How many flights depart from Seoul to Sydney on average per day?

13 flights are operational daily from Seoul to Sydney as of September 2026. The most popular departure time for this route is 19:00, with 72% of flights per day taking off in the evening.

What is the cheapest airline that flies from Seoul to Sydney Kingsford Smith?

Jetstar, VietJet Air, and Batik Air are the most popular carriers operating from Seoul to Sydney Kingsford Smith

How many flights depart from Seoul to Sydney on average per week?

94 flights are operational weekly from Seoul to Sydney as of September 2026. The most popular departure day for this route is Fri, with 16% of flights per week taking off on this day.

Which airlines fly to Sydney?

Jetstar, Asiana Airlines and Trinity Airways (Formerly T'way Air) are the top three most popular airlines that fly to Sydney from Seoul according to our data. Jetstar is the first choice among our users, with 34% of people opting to fly with this airline when travelling to Sydney. Keep in mind that there are 5 different airlines that fly to Sydney on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from Seoul to Sydney Kingsford Smith Airport?

Prices for flights from Seoul to Sydney Kingsford Smith Airport are updated daily.

How many operators does momondo search for flights from Seoul to Sydney Kingsford Smith Airport?

There are 5 operators available for flights from Seoul to Sydney Kingsford Smith Airport as of September 2026.

How old do you have to be to fly from Seoul to Sydney Kingsford Smith Airport?

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and stopovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Seoul to Sydney Kingsford Smith Airport.

What documentation or ID do you need to fly to Sydney Kingsford Smith Airport?

The travel and health documents required for your trip to Sydney Kingsford Smith Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s licence, and a passport valid for six-months after you plan to arrive at Sydney Kingsford Smith Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

$416 Cheap Flights from Seoul to Sydney in 2026/27

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Seoul to Sydney

Return

One-way

Last minute

Direct

Cheap return flights

Enter your travel dates to find the best prices.

21:50 - 10:05ICN Incheon Intl-SYD Sydney Kingsford Smith

10h 15mdirect

11:40 - 20:15SYD Sydney Kingsford Smith-ICN Incheon Intl

10h 35mdirect

$820Jetstar

Wed, 28 Oct - Mon, 2 Nov

21:50 - 10:05ICN Incheon Intl-SYD Sydney Kingsford Smith

10h 15mdirect

11:40 - 20:15SYD Sydney Kingsford Smith-ICN Incheon Intl

10h 35mdirect

$820Jetstar

Tue, 16 Feb - Tue, 23 Feb

16:10 - 13:35ICN Incheon Intl-SYD Sydney Kingsford Smith

19h 25m1 stop Shanghai Pu Dong

21:30 - 18:55SYD Sydney Kingsford Smith-ICN Incheon Intl

23h 25m2 stops Shanghai Pu Dong Xi'an Xianyang

$820China Eastern

Tue, 3 Nov - Tue, 10 Nov

07:45 - 09:15ICN Incheon Intl-SYD Sydney Kingsford Smith

23h 30m2 stops Yantai Penglai Intl Wuhan

10:50 - 13:15SYD Sydney Kingsford Smith-ICN Incheon Intl

28h 25m2 stops Wuhan Qingdao Jiaodong Intl

$820China Eastern

Sun, 25 Oct - Sat, 31 Oct

21:40 - 10:15ICN Incheon Intl-SYD Sydney Kingsford Smith

10h 35mdirect

12:15 - 21:15SYD Sydney Kingsford Smith-ICN Incheon Intl

11h 00mdirect

$897Trinity Airways (Formerly T'way Air)

Mon, 26 Oct - Mon, 9 Nov

22:10 - 10:55ICN Incheon Intl-SYD Sydney Kingsford Smith

10h 45mdirect

12:15 - 21:15SYD Sydney Kingsford Smith-ICN Incheon Intl

11h 00mdirect

$909Trinity Airways (Formerly T'way Air)

Thu, 22 Oct - Fri, 30 Oct

21:50 - 10:05ICN Incheon Intl-SYD Sydney Kingsford Smith

10h 15mdirect

11:40 - 20:15SYD Sydney Kingsford Smith-ICN Incheon Intl

10h 35mdirect

$977Qantas Airways

Thu, 18 Feb - Wed, 24 Feb

21:50 - 10:05ICN Incheon Intl-SYD Sydney Kingsford Smith

10h 15mdirect

11:40 - 20:15SYD Sydney Kingsford Smith-ICN Incheon Intl

10h 35mdirect

$1,000Qantas Airways

Sat, 12 Dec - Wed, 6 Jan

20:00 - 08:20ICN Incheon Intl-SYD Sydney Kingsford Smith

10h 20mdirect

21:55 - 06:35SYD Sydney Kingsford Smith-ICN Incheon Intl

10h 40mdirect

$1,216Asiana Airlines

Thu, 25 Mar - Tue, 30 Mar

20:00 - 08:20ICN Incheon Intl-SYD Sydney Kingsford Smith

10h 20mdirect

21:55 - 06:35SYD Sydney Kingsford Smith-ICN Incheon Intl

10h 40mdirect

$1,219Asiana Airlines

Sat, 27 Mar - Tue, 30 Mar

Cheap last-minute flights

Enter your travel dates to find the best prices.

19:40 - 08:00ICN Incheon Intl-SYD Sydney Kingsford Smith

35h 20m2 stops Xi'an Xianyang Nanjing Lukou Intl

11:00 - 12:10SYD Sydney Kingsford Smith-ICN Incheon Intl

27h 10m2 stops Wuhan Qingdao Jiaodong Intl

$880China Eastern

Fri, 2 Oct - Sat, 10 Oct

12:15 - 08:00ICN Incheon Intl-SYD Sydney Kingsford Smith

18h 45m1 stop Nanjing Lukou Intl

11:00 - 11:00SYD Sydney Kingsford Smith-ICN Incheon Intl

26h 00m2 stops Wuhan Qingdao Jiaodong Intl

$880China Eastern

Sat, 3 Oct - Sat, 10 Oct

21:50 - 10:05ICN Incheon Intl-SYD Sydney Kingsford Smith

10h 15mdirect

11:45 - 20:15SYD Sydney Kingsford Smith-ICN Incheon Intl

10h 30mdirect

$1,218Jetstar

Mon, 5 Oct - Tue, 13 Oct

21:50 - 10:05ICN Incheon Intl-SYD Sydney Kingsford Smith

10h 15mdirect

11:45 - 20:15SYD Sydney Kingsford Smith-ICN Incheon Intl

10h 30mdirect

$1,252Jetstar

Mon, 5 Oct - Wed, 7 Oct

22:10 - 10:55ICN Incheon Intl-SYD Sydney Kingsford Smith

10h 45mdirect

12:40 - 21:30SYD Sydney Kingsford Smith-ICN Incheon Intl

10h 50mdirect

$1,469Trinity Airways (Formerly T'way Air)

Mon, 5 Oct - Thu, 8 Oct

22:10 - 10:55ICN Incheon Intl-SYD Sydney Kingsford Smith

10h 45mdirect

12:40 - 21:30SYD Sydney Kingsford Smith-ICN Incheon Intl

10h 50mdirect

$1,469Trinity Airways (Formerly T'way Air)

Mon, 5 Oct - Thu, 8 Oct

08:00 - 19:20ICN Incheon Intl-SYD Sydney Kingsford Smith

10h 20mdirect

20:55 - 06:30SYD Sydney Kingsford Smith-ICN Incheon Intl

10h 35mdirect

$1,491Asiana Airlines

Wed, 30 Sep - Thu, 1 Oct

08:00 - 19:20ICN Incheon Intl-SYD Sydney Kingsford Smith

10h 20mdirect

20:55 - 06:30SYD Sydney Kingsford Smith-ICN Incheon Intl

10h 35mdirect

$1,501Asiana Airlines

Wed, 30 Sep - Thu, 1 Oct

19:10 - 06:20ICN Incheon Intl-SYD Sydney Kingsford Smith

10h 10mdirect

07:55 - 17:35SYD Sydney Kingsford Smith-ICN Incheon Intl

10h 40mdirect

$1,570Korean Air

Wed, 30 Sep - Fri, 2 Oct

19:10 - 06:20ICN Incheon Intl-SYD Sydney Kingsford Smith

10h 10mdirect

07:55 - 17:35SYD Sydney Kingsford Smith-ICN Incheon Intl

10h 40mdirect

$1,571Korean Air

Wed, 30 Sep - Fri, 2 Oct

Cheap direct flights

Enter your travel dates to find the best prices.

21:50 - 10:05ICN Incheon Intl-SYD Sydney Kingsford Smith

10h 15mdirect

11:40 - 20:15SYD Sydney Kingsford Smith-ICN Incheon Intl

10h 35mdirect

$820Jetstar

Wed, 28 Oct - Mon, 2 Nov

21:50 - 10:05ICN Incheon Intl-SYD Sydney Kingsford Smith

10h 15mdirect

11:40 - 20:15SYD Sydney Kingsford Smith-ICN Incheon Intl

10h 35mdirect

$820Jetstar

Tue, 16 Feb - Tue, 23 Feb

21:50 - 10:05ICN Incheon Intl-SYD Sydney Kingsford Smith

10h 15mdirect

12:15 - 21:15SYD Sydney Kingsford Smith-ICN Incheon Intl

11h 00mdirect

$829Multiple Airlines

Wed, 11 Nov - Wed, 18 Nov

21:40 - 10:15ICN Incheon Intl-SYD Sydney Kingsford Smith

10h 35mdirect

11:40 - 20:15SYD Sydney Kingsford Smith-ICN Incheon Intl

10h 35mdirect

$829Multiple Airlines

Sun, 25 Oct - Mon, 2 Nov

21:40 - 10:15ICN Incheon Intl-SYD Sydney Kingsford Smith

10h 35mdirect

12:15 - 21:15SYD Sydney Kingsford Smith-ICN Incheon Intl

11h 00mdirect

$897Trinity Airways (Formerly T'way Air)

Mon, 26 Oct - Mon, 9 Nov

22:10 - 10:55ICN Incheon Intl-SYD Sydney Kingsford Smith

10h 45mdirect

12:15 - 21:15SYD Sydney Kingsford Smith-ICN Incheon Intl

11h 00mdirect

$909Trinity Airways (Formerly T'way Air)

Thu, 22 Oct - Fri, 30 Oct

21:50 - 10:05ICN Incheon Intl-SYD Sydney Kingsford Smith

10h 15mdirect

11:40 - 20:15SYD Sydney Kingsford Smith-ICN Incheon Intl

10h 35mdirect

$977Qantas Airways

Thu, 18 Feb - Wed, 24 Feb

21:50 - 10:05ICN Incheon Intl-SYD Sydney Kingsford Smith

10h 15mdirect

11:40 - 20:15SYD Sydney Kingsford Smith-ICN Incheon Intl

10h 35mdirect

$1,000Qantas Airways

Sat, 12 Dec - Wed, 6 Jan

20:00 - 08:20ICN Incheon Intl-SYD Sydney Kingsford Smith

10h 20mdirect

21:55 - 06:35SYD Sydney Kingsford Smith-ICN Incheon Intl

10h 40mdirect

$1,216Asiana Airlines

Thu, 25 Mar - Tue, 30 Mar

20:00 - 08:20ICN Incheon Intl-SYD Sydney Kingsford Smith

10h 20mdirect

21:55 - 06:35SYD Sydney Kingsford Smith-ICN Incheon Intl

10h 40mdirect

$1,219Asiana Airlines

Sat, 27 Mar - Tue, 30 Mar

Save money when you book flights with momondo

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customise your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

China Eastern flights from Seoul to Sydney

Our best China Eastern deals on Seoul to Sydney flight tickets

China Eastern

25 Oct

ICN07:45Incheon Intl

23h 30m

2 stops

SYD09:15Sydney Kingsford Smith

30 Oct

SYD11:10Sydney Kingsford Smith

33h 45m

2 stops

ICN18:55Incheon Intl

$820

China Eastern

24 Oct

ICN12:15Incheon Intl

18h 45m

1 stop

SYD09:00Sydney Kingsford Smith

27 Oct

SYD21:30Sydney Kingsford Smith

21h 55m

1 stop

ICN17:25Incheon Intl

$825

China Eastern

18 Nov

ICN16:10Incheon Intl

15h 50m

1 stop

SYD10:00Sydney Kingsford Smith

29 Nov

SYD11:05Sydney Kingsford Smith

34h 45m

1 stop

ICN19:50Incheon Intl

$826

Jetstar flights from Seoul to Sydney

Our best Jetstar deals on Seoul to Sydney flight tickets

Jetstar

9 Nov

ICN21:50Incheon Intl

10h 15m

SYD10:05Sydney Kingsford Smith

19 Nov

SYD11:40Sydney Kingsford Smith

10h 35m

ICN20:15Incheon Intl

$835

Jetstar

22 Oct

ICN21:50Incheon Intl

10h 15m

SYD10:05Sydney Kingsford Smith

26 Oct

SYD11:40Sydney Kingsford Smith

10h 35m

ICN20:15Incheon Intl

$839

Jetstar

9 Nov

ICN21:50Incheon Intl

10h 15m

SYD10:05Sydney Kingsford Smith

16 Nov

SYD11:40Sydney Kingsford Smith

10h 35m

ICN20:15Incheon Intl

$840

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

Fastest return journey

IncheonSydney

ICN Incheon Intl - SYD Sydney Kingsford Smith

ICNSYD

Incheon Intl

Wed 28/10

21:50-10:05

Nonstop10h 15m

Sydney Kingsford Smith

Mon 2/11

11:40-20:15

Nonstop10h 35m

$820

IncheonSydney

ICN Incheon Intl - SYD Sydney Kingsford Smith

ICNSYD

Incheon Intl

Tue 16/2

21:50-10:05

Nonstop10h 15m

Sydney Kingsford Smith

Tue 23/2

11:40-20:15

Nonstop10h 35m

$820

IncheonSydney

ICN Incheon Intl - SYD Sydney Kingsford Smith

ICNSYD

Incheon Intl

Tue 3/11

16:10-13:35

1 stop19h 25m

Sydney Kingsford Smith

Tue 10/11

21:30-18:55

2 stops23h 25m

$820

IncheonSydney

ICN Incheon Intl - SYD Sydney Kingsford Smith

ICNSYD

Incheon Intl

Sun 25/10

07:45-09:15

2 stops23h 30m

Sydney Kingsford Smith

Sat 31/10

10:50-13:15

2 stops28h 25m

$820

IncheonSydney

ICN Incheon Intl - SYD Sydney Kingsford Smith

ICNSYD

Incheon Intl

Mon 26/10

21:40-10:15

Nonstop10h 35m

Sydney Kingsford Smith

Mon 9/11

12:15-21:15

Nonstop11h 00m

$897

IncheonSydney

ICN Incheon Intl - SYD Sydney Kingsford Smith

ICNSYD

Incheon Intl

Thu 22/10

22:10-10:55

Nonstop10h 45m

Sydney Kingsford Smith

Fri 30/10

12:15-21:15

Nonstop11h 00m

$909

IncheonSydney

ICN Incheon Intl - SYD Sydney Kingsford Smith

ICNSYD

Incheon Intl

Thu 18/2

21:50-10:05

Nonstop10h 15m

Sydney Kingsford Smith

Wed 24/2

11:40-20:15

Nonstop10h 35m

$977

IncheonSydney

ICN Incheon Intl - SYD Sydney Kingsford Smith

ICNSYD

Incheon Intl

Sat 12/12

21:50-10:05

Nonstop10h 15m

Sydney Kingsford Smith

Wed 6/1

11:40-20:15

Nonstop10h 35m

$1,000

IncheonSydney

ICN Incheon Intl - SYD Sydney Kingsford Smith

ICNSYD

Incheon Intl

Thu 25/3

20:00-08:20

Nonstop10h 20m

Sydney Kingsford Smith

Tue 30/3

21:55-06:35

Nonstop10h 40m

$1,216

IncheonSydney

ICN Incheon Intl - SYD Sydney Kingsford Smith

ICNSYD

Incheon Intl

Sat 27/3

20:00-08:20

Nonstop10h 20m

Sydney Kingsford Smith

Tue 30/3

21:55-06:35

Nonstop10h 40m

$1,219

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Seoul to Sydney

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Other information

What is the typical price of a round-trip flight between Seoul and Sydney?

Prices are currently low for flights on this route.

Typical prices usually range from $845 to $1,363.
The lowest price recently found on this route was $820.

What is the cheapest month to fly to Sydney?

The month of March is, on average, the cheapest month to fly to Sydney from Seoul, with most prices found around $731. If you aren’t able to travel to Sydney during the month of March, then flying in June is also cheap. Prices for this month can be found on momondo for an average of $849.

What is the cheapest day to depart on your flight to Sydney?

Our data shows that Monday is the least expensive day to fly to Sydney. Tickets to fly out on this day can be as low as $640. The most expensive day to fly to Sydney is Saturday, with ticket prices averaging around $1,356.

What is the cheapest time of day to depart on your flight to Sydney?

According to our data, the cheapest time of day to fly to Sydney is in the evening. momondo users have found flights departing from Seoul to Sydney in the evening for as low as $827. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are $1,544 on average. Flights to Sydney from Seoul in the afternoon are generally more expensive because this time of day is more convenient for travellers’ schedules.

What is the cheapest Seoul to Sydney Kingsford Smith flight route?

Fly from Incheon Intl to Sydney Kingsford Smith for the best Seoul - Sydney Kingsford Smith flight prices

How far in advance should I book a flight from Seoul to Sydney?

You are more likely to see cheaper flights to Sydney from Seoul when booking weeks ahead of your departure date. In general, you can expect to find flights to Sydney for around $1,000 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Sydney from Seoul for as low as $785 on momondo.

What cabin class options are available on Seoul to Sydney flights?

There are 3 cabin classes available to choose from on Seoul to Sydney flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Seoul to Sydney flights?

No. A direct flight is the cheapest option for a flight between Seoul to Sydney.

How have Seoul to Sydney flight prices changed over time?

As of September 2026, prices for Seoul to Sydney flights are approximately 2% more expensive when compared to flights at the same time last year.

When to book flights from Seoul to Sydney

Are you open to changing your travel dates? Check out the ideal times to fly from Seoul to Sydney according to our flight data. Find out which month and days have the cheapest flights.

Estimated return price

Cheap Seoul to Sydney (SEL to SYD) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seoul to Sydney

Best price found	$416
Fastest flight time	10h 15m
Direct flights	Every day
Airports in Sydney	1 airport

The best one-way flight to Sydney from Seoul in the past 72 hours is $416. The best return flight deal from Seoul to Sydney found on momondo in the last 72 hours is $820.

The fastest flight from Seoul to Sydney takes 10h 15m

Direct flights go from Seoul to Sydney every day.

There is 1 airport in Sydney. From Seoul there are direct flights to Sydney Kingsford Smith (SYD).

Search flight deals

Frequently asked questions about flying from Seoul to Sydney

How far is Seoul to Sydney Kingsford Smith by plane?
Sydney Kingsford Smith is 8322.5 km away from Seoul. By plane, this route typically takes 10h 15m.
When did momondo last update prices for flights from Seoul to Sydney Kingsford Smith Airport?
Prices for flights from Seoul to Sydney Kingsford Smith Airport are updated daily.
How many operators does momondo search for flights from Seoul to Sydney Kingsford Smith Airport?
There are 5 operators available for flights from Seoul to Sydney Kingsford Smith Airport as of September 2026.
How old do you have to be to fly from Seoul to Sydney Kingsford Smith Airport?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and stopovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Seoul to Sydney Kingsford Smith Airport.
What documentation or ID do you need to fly to Sydney Kingsford Smith Airport?
The travel and health documents required for your trip to Sydney Kingsford Smith Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s licence, and a passport valid for six-months after you plan to arrive at Sydney Kingsford Smith Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular plane model from Seoul to Sydney?
momondo data reveals that the most frequently booked plane model on the route from Seoul to Sydney is Boeing 787-8 Dreamliner, representing 34.24% of all bookings. The subsequent popular models are Boeing 787-10 Dreamliner at 27.46%, Airbus A380-800 at 14.57%, and Airbus A330-300 at 14.19%.
What is the most popular airline from Seoul to Sydney?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Seoul to Sydney is Jetstar (61% of total bookings). The next most popular airline is Trinity Airways (Formerly T'way Air) (39%).

Best airlines flying from Seoul to Sydney

Compare and see reviews for airlines that fly from Seoul to Sydney with momondo

Airline	Rating	Free cancellation	Price
Jetstar	PriceFrom $589	Free cancellation	Rating 6.5 570 reviews	Search Jetstar flights
Trinity Airways (Formerly T'way Air)	PriceFrom $665	Free cancellation	Rating 0.0 0 reviews	Search Trinity Airways (Formerly T'way Air) flights
Asiana Airlines	PriceFrom $946	Free cancellation	Rating 8.1 563 reviews	Search Asiana Airlines flights
Qantas Airways	PriceFrom $957	Free cancellation	Rating 7.5 1,102 reviews	Search Qantas Airways flights
Korean Air	PriceFrom $1,111	Free cancellation	Rating 8.4 1,218 reviews	Search Korean Air flights

Korean Air Flights From Seoul to Sydney
Across 14 Korean Air flights from Seoul to Sydney this week, the average price was $1,489, with the best Korean Air deals starting from $1,111 round-trip. 1,218 users have rated Korean Air on momondo, with an average score of 8.4/10.
Asiana Airlines Flights From Seoul to Sydney
Asiana Airlines (8.1/10 from 563 reviews) operates around 14 flights from Seoul to Sydney in any given week. The average Asiana Airlines airfare for this route is around $1,402, with deals from around $946 rare but found on momondo. Referenced prices are for round-trip Seoul to Sydney flight searches in the last 72 hours.

Parramatta

Terrigal

Wollongong

Katoomba

Penrith

Coogee

Lithgow

Manly

Cronulla

Randwick

Leura

Bondi Beach

Charlestown

Swansea

Newport

Why use momondo?

Why should I use momondo to find a flight deal from Seoul to Sydney?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Sydney from Seoul.

Can I find flights from Seoul to Sydney with flexible booking policies on momondo?

All flight searches from Seoul to Sydney on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Seoul to Sydney?

Once you have performed a search for Seoul to Sydney flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Seoul to Sydney right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Seoul to Sydney flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.