What is the cheapest airline that flies from Boston Logan Intl to Sydney Kingsford Smith?

Air Canada and Singapore Airlines are the most popular carriers operating from Boston Logan Intl to Sydney Kingsford Smith

When did momondo last update prices for flights from Boston Logan Intl Airport to Sydney Kingsford Smith Airport?

Prices for flights from Boston Logan Intl Airport to Sydney Kingsford Smith Airport refresh daily.

How many operators does momondo search for flights from Boston Logan Intl Airport to Sydney Kingsford Smith Airport?

There are 2 operators available for flights from Boston Logan Intl Airport to Sydney Kingsford Smith Airport as of March 2026.

How old do you have to be to fly from Boston Logan Intl Airport to Sydney Kingsford Smith Airport?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and stopovers. It is recommended that you verify with the airline you are booking with for travel from Boston Logan Intl Airport 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.

$623 Cheap Flights from Boston to Sydney in 2026

Q: What is the typical price of a round-trip flight between Boston and Sydney?

Prices are currently typical for flights on this route. Typical prices usually range from $1,333 to $2,044. The lowest price recently found on this route was $1,626.

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Find the cheapest flights from Boston to Sydney

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Enter your travel dates to find the best prices.

12:15 - 07:05

BOS

SYD

28h 50m

1 stop

21:25 - 08:41

SYD

BOS

25h 16m

2 stops

$1,626American Airlines

Fri, 29 May - Fri, 12 Jun

13:37 - 06:55

BOS

SYD

27h 18m

2 stops

10:20 - 23:54

SYD

BOS

27h 34m

2 stops

$1,635United Airlines

Sat, 8 Aug - Sat, 29 Aug

15:06 - 06:25

BOS

SYD

25h 19m

2 stops

21:25 - 08:41

SYD

BOS

25h 16m

2 stops

$1,636American Airlines

Fri, 29 May - Fri, 12 Jun

18:40 - 07:20

BOS

SYD

46h 40m

3 stops

09:20 - 09:59

SYD

BOS

38h 39m

2 stops

$1,642Air Canada

Fri, 17 Apr - Fri, 24 Apr

08:00 - 07:30

BOS

SYD

33h 30m

1 stop

09:10 - 16:35

SYD

BOS

21h 25m

1 stop

$1,649Qantas Airways

Wed, 24 Jun - Sat, 18 Jul

20:16 - 07:55

BOS

SYD

44h 39m

1 stop

10:20 - 21:27

SYD

BOS

25h 07m

1 stop

$1,652United Airlines

Fri, 3 Apr - Thu, 14 May

17:20 - 09:00

BOS

SYD

24h 40m

1 stop

11:20 - 19:31

SYD

BOS

23h 11m

1 stop

$1,653Qantas Airways

Tue, 17 Mar - Thu, 19 Mar

08:00 - 07:05

BOS

SYD

33h 05m

1 stop

09:10 - 16:35

SYD

BOS

21h 25m

1 stop

$1,655Qantas Airways

Fri, 17 Jul - Wed, 29 Jul

05:50 - 07:30

BOS

SYD

34h 40m

2 stops

09:40 - 06:10

SYD

BOS

35h 30m

2 stops

$1,656Delta

Fri, 13 Mar - Sun, 22 Mar

20:16 - 06:55

BOS

SYD

44h 39m

1 stop

09:30 - 21:59

SYD

BOS

26h 29m

2 stops

$1,659United Airlines

Fri, 17 Apr - Fri, 24 Apr

Qantas Airways flights from Boston to Sydney

Our best Qantas Airways deals on Boston to Sydney flight tickets

Qantas Airways

24 June

BOS08:00Boston Logan Intl

33h 30m

1 stop

SYD07:30Sydney Kingsford Smith

18 July

SYD09:10Sydney Kingsford Smith

21h 25m

1 stop

BOS16:35Boston Logan Intl

$1,649

Qantas Airways

17 Mar

BOS17:20Boston Logan Intl

24h 40m

1 stop

SYD09:00Sydney Kingsford Smith

19 Mar

SYD11:20Sydney Kingsford Smith

23h 11m

1 stop

BOS19:31Boston Logan Intl

$1,653

Qantas Airways

17 July

BOS08:00Boston Logan Intl

33h 05m

1 stop

SYD07:05Sydney Kingsford Smith

28 July

SYD09:10Sydney Kingsford Smith

28h 19m

1 stop

BOS23:29Boston Logan Intl

$1,655

United Airlines flights from Boston to Sydney

Our best United Airlines deals on Boston to Sydney flight tickets

United Airlines

8 Aug

BOS13:37Boston Logan Intl

27h 18m

2 stops

SYD06:55Sydney Kingsford Smith

29 Aug

SYD10:20Sydney Kingsford Smith

27h 34m

2 stops

BOS23:54Boston Logan Intl

$1,635

United Airlines

3 Apr

BOS20:16Boston Logan Intl

44h 39m

1 stop

SYD07:55Sydney Kingsford Smith

14 May

SYD10:20Sydney Kingsford Smith

25h 07m

1 stop

BOS21:27Boston Logan Intl

$1,652

United Airlines

17 Apr

BOS20:16Boston Logan Intl

44h 39m

1 stop

SYD06:55Sydney Kingsford Smith

24 Apr

SYD09:30Sydney Kingsford Smith

26h 29m

2 stops

BOS21:59Boston Logan Intl

$1,659

Fly from

Fly to

Route

Depart

Return

Price

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Fri 29/5

12:15-07:05

1 stop28h 50m

Sydney Kingsford Smith

Fri 12/6

21:25-08:41

2 stops25h 16m

$1,626

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sat 8/8

13:37-06:55

2 stops27h 18m

Sydney Kingsford Smith

Sat 29/8

10:20-23:54

2 stops27h 34m

$1,635

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Fri 29/5

15:06-06:25

2 stops25h 19m

Sydney Kingsford Smith

Fri 12/6

21:25-08:41

2 stops25h 16m

$1,636

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Fri 17/4

18:40-07:20

3 stops46h 40m

Sydney Kingsford Smith

Fri 24/4

09:20-09:59

2 stops38h 39m

$1,642

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Wed 24/6

08:00-07:30

1 stop33h 30m

Sydney Kingsford Smith

Sat 18/7

09:10-16:35

1 stop21h 25m

$1,649

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Fri 3/4

20:16-07:55

1 stop44h 39m

Sydney Kingsford Smith

Thu 14/5

10:20-21:27

1 stop25h 07m

$1,652

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Tue 17/3

17:20-09:00

1 stop24h 40m

Sydney Kingsford Smith

Thu 19/3

11:20-19:31

1 stop23h 11m

$1,653

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Fri 17/7

08:00-07:05

1 stop33h 05m

Sydney Kingsford Smith

Wed 29/7

09:10-16:35

1 stop21h 25m

$1,655

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Fri 13/3

05:50-07:30

2 stops34h 40m

Sydney Kingsford Smith

Sun 22/3

09:40-06:10

2 stops35h 30m

$1,656

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Fri 17/4

20:16-06:55

1 stop44h 39m

Sydney Kingsford Smith

Fri 24/4

09:30-21:59

2 stops26h 29m

$1,659

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 Boston 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

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

What is the cheapest month to fly to Sydney?

The month of September is, on average, the cheapest month to fly to Sydney from Boston, with most prices found around $1,674. If you aren’t able to travel to Sydney during the month of September, then flying in March is also cheap. Prices for this month can be found on momondo for an average of $1,711.

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

You are more likely to see cheaper flights to Sydney from Boston when booking weeks ahead of your departure date. In general, you can expect to find flights to Sydney for around $2,017 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 Boston for as low as $1,790 on momondo.

How have Boston to Sydney flight prices changed over time?

As of March 2026, prices for Boston to Sydney flights are approximately 3% cheaper when compared to flights at the same time last year.

When to book flights from Boston to Sydney

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

Estimated return price

Cheap Boston to Sydney (BOS to SYD) flight deals and tips

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

Fastest flight time	24h 34m
Direct flights	None

The fastest flight from Boston to Sydney takes 24h 34m

There are no direct flights from Boston to Sydney. There are no popular flight routes from Boston to Sydney.

Search flight deals

How far is Boston Logan Intl to Sydney Kingsford Smith by plane?
The straight-line distance from Boston Logan Intl to Sydney Kingsford Smith is 16229.2 km. Typically, this will take 24h 34m by plane in normal conditions.
When did momondo last update prices for flights from Boston Logan Intl Airport to Sydney Kingsford Smith Airport?
Prices for flights from Boston Logan Intl Airport to Sydney Kingsford Smith Airport refresh daily.
How many operators does momondo search for flights from Boston Logan Intl Airport to Sydney Kingsford Smith Airport?
There are 2 operators available for flights from Boston Logan Intl Airport to Sydney Kingsford Smith Airport as of March 2026.
How old do you have to be to fly from Boston Logan Intl Airport to Sydney Kingsford Smith Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and stopovers. It is recommended that you verify with the airline you are booking with for travel from Boston Logan Intl Airport 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 airline from Boston to Sydney?
Based on momondo bookings for flights between Boston and Sydney, the leading airline is Qantas Airways, making up 59% of the total bookings. Other popular airlines include United Airlines with 41%.

Best airlines flying from Boston to Sydney

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

Airline	Rating	Free cancellation	Price
United Airlines	PriceFrom $1,169	Free cancellation	Rating 7.4 9,378 reviews		Search United Airlines flights
Qantas Airways	PriceFrom $1,386	Free cancellation	Rating 7.5 1,000 reviews		Search Qantas Airways flights

Parramatta

Wollongong

Terrigal

Penrith

Katoomba

Lithgow

Manly

Leura

Coogee

Bondi Beach

Cronulla

Randwick

Charlestown

Newport

Swansea

Why use momondo?

Why should I use momondo to find a flight deal from Boston 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 Boston.

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

Yes. momondo enables you to select and highlight flights to Sydney from Boston with this policy.

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

Once you have performed a search for Boston 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 Boston to Sydney right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Sydney, momondo offers a useful price alert feature which will track prices for flights to Sydney from Boston and alert you when they change.