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

American Airlines, United Airlines, and Delta 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 May 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.

$970 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 low for flights on this route. Typical prices usually range from $2,290 to $1,748. The lowest price recently found on this route was $1,484.

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Find the cheapest flights from Boston to Sydney

Round-trip

One-way

Last minute

Cheap return flights

Enter your travel dates to find the best prices.

15:00 - 07:05

BOS

SYD

26h 05m

1 stop

19:15 - 22:21

SYD

BOS

43h 06m

2 stops

$1,484Qantas Airways

Sun, 9 Aug - Wed, 16 Dec

12:00 - 09:00

BOS

SYD

29h 00m

1 stop

07:05 - 17:31

SYD

BOS

26h 26m

2 stops

$1,603Qantas Airways

Sun, 8 Nov - Sat, 6 Feb

10:35 - 07:20

BOS

SYD

30h 45m

2 stops

09:20 - 09:45

SYD

BOS

38h 25m

2 stops

$1,658Air Canada

Wed, 3 Jun - Sun, 7 Jun

10:35 - 07:20

BOS

SYD

30h 45m

2 stops

09:20 - 09:45

SYD

BOS

38h 25m

2 stops

$1,680Air Canada

Wed, 3 Jun - Sun, 7 Jun

06:00 - 07:20

BOS

SYD

35h 20m

2 stops

09:20 - 21:27

SYD

BOS

26h 07m

2 stops

$1,684Air Canada

Mon, 10 Aug - Wed, 26 Aug

05:50 - 07:20

BOS

SYD

35h 30m

2 stops

09:20 - 09:45

SYD

BOS

38h 25m

2 stops

$1,689Air Canada

Wed, 3 Jun - Sun, 7 Jun

10:35 - 07:20

BOS

SYD

30h 45m

3 stops

09:20 - 09:45

SYD

BOS

38h 25m

2 stops

$1,691Air Canada

Wed, 3 Jun - Sun, 7 Jun

10:35 - 07:20

BOS

SYD

30h 45m

2 stops

09:20 - 09:45

SYD

BOS

38h 25m

2 stops

$1,694Air Canada

Mon, 1 Jun - Mon, 15 Jun

10:35 - 07:20

BOS

SYD

30h 45m

2 stops

09:20 - 09:45

SYD

BOS

38h 25m

2 stops

$1,696Air Canada

Mon, 1 Jun - Mon, 15 Jun

06:00 - 07:20

BOS

SYD

35h 20m

2 stops

09:20 - 09:50

SYD

BOS

38h 30m

3 stops

$1,697Air Canada

Mon, 10 Aug - Wed, 26 Aug

Air Canada flights from Boston to Sydney

Our best Air Canada deals on Boston to Sydney flight tickets

Air Canada

24 May

BOS10:45Boston Logan Intl

30h 35m

2 stops

SYD07:20Sydney Kingsford Smith

7 June

SYD09:20Sydney Kingsford Smith

38h 25m

2 stops

BOS09:45Boston Logan Intl

$1,640

Air Canada

3 June

BOS10:35Boston Logan Intl

30h 45m

2 stops

SYD07:20Sydney Kingsford Smith

7 June

SYD09:20Sydney Kingsford Smith

38h 25m

2 stops

BOS09:45Boston Logan Intl

$1,658

Air Canada

3 June

BOS10:35Boston Logan Intl

30h 45m

2 stops

SYD07:20Sydney Kingsford Smith

7 June

SYD09:20Sydney Kingsford Smith

38h 25m

2 stops

BOS09:45Boston Logan Intl

$1,680

Qantas Airways flights from Boston to Sydney

Our best Qantas Airways deals on Boston to Sydney flight tickets

Qantas Airways

9 Aug

BOS15:00Boston Logan Intl

26h 05m

1 stop

SYD07:05Sydney Kingsford Smith

16 Dec

SYD19:15Sydney Kingsford Smith

43h 06m

2 stops

BOS22:21Boston Logan Intl

$1,484

Qantas Airways

8 Nov

BOS12:00Boston Logan Intl

29h 00m

1 stop

SYD09:00Sydney Kingsford Smith

6 Feb

SYD07:05Sydney Kingsford Smith

26h 26m

2 stops

BOS17:31Boston Logan Intl

$1,603

Qantas Airways

26 May

BOS08:15Boston Logan Intl

32h 50m

1 stop

SYD07:05Sydney Kingsford Smith

9 June

SYD09:10Sydney Kingsford Smith

25h 28m

1 stop

BOS20:38Boston Logan Intl

$1,776

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 9/8

15:00-07:05

1 stop26h 05m

Sydney Kingsford Smith

Wed 16/12

19:15-22:21

2 stops43h 06m

$1,484

Fastest return journey

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 8/11

12:00-09:00

1 stop29h 00m

Sydney Kingsford Smith

Sat 6/2

07:05-17:31

2 stops26h 26m

$1,603

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Wed 3/6

10:35-07:20

2 stops30h 45m

Sydney Kingsford Smith

Sun 7/6

09:20-09:45

2 stops38h 25m

$1,658

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Wed 3/6

10:35-07:20

2 stops30h 45m

Sydney Kingsford Smith

Sun 7/6

09:20-09:45

2 stops38h 25m

$1,680

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 10/8

06:00-07:20

2 stops35h 20m

Sydney Kingsford Smith

Wed 26/8

09:20-21:27

2 stops26h 07m

$1,684

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Wed 3/6

05:50-07:20

2 stops35h 30m

Sydney Kingsford Smith

Sun 7/6

09:20-09:45

2 stops38h 25m

$1,689

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Wed 3/6

10:35-07:20

3 stops30h 45m

Sydney Kingsford Smith

Sun 7/6

09:20-09:45

2 stops38h 25m

$1,691

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 1/6

10:35-07:20

2 stops30h 45m

Sydney Kingsford Smith

Mon 15/6

09:20-09:45

2 stops38h 25m

$1,694

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 1/6

10:35-07:20

2 stops30h 45m

Sydney Kingsford Smith

Mon 15/6

09:20-09:45

2 stops38h 25m

$1,696

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 10/8

06:00-07:20

2 stops35h 20m

Sydney Kingsford Smith

Wed 26/8

09:20-09:50

3 stops38h 30m

$1,697

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 $1,690. 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 $1,812.

How far in advance should I book a flight from Boston 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 $2,073 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 $1,818 on momondo.

Can stopping save me money on Boston to Sydney flights?

You could potentially save up to 12% on your flight if you consider stops on a Boston to Sydney flight.

How have Boston to Sydney flight prices changed over time?

As of May 2026, prices for Boston to Sydney flights are approximately 44% 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	23h 30m
Direct flights	None

The fastest flight from Boston to Sydney takes 23h 30m

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

Search flight deals

Frequently asked questions about flying from Boston to Sydney

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 23h 30m 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 May 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 56% of the total bookings. Other popular airlines include United Airlines with 44%.

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
Qantas Airways	PriceFrom $1,376	Free cancellation	Rating 7.5 1,038 reviews		Search Qantas Airways flights
United Airlines	PriceFrom $1,632	Free cancellation	Rating 7.4 9,747 reviews		Search United Airlines flights

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Wollongong

Terrigal

Penrith

Katoomba

Lithgow

Manly

Coogee

Leura

Bondi Beach

Randwick

Cronulla

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.