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Cheap flights from Boston to Sydney from $520

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Boston to Sydney departing on 2/24. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Cheap round-trip flights

Enter your travel dates to find the best prices.
Qantas Airways Logo
7:15 am - 9:00 am
BOS
-
SYD
33h 45m1 stop
Qantas Airways Logo
5:50 pm - 6:40 pm
SYD
-
BOS
40h 50m2 stops
$917Qantas Airways
Sun, Feb 15 - Mon, Mar 2
Multiple Airlines Logo
6:00 am - 12:35 pm
BOS
-
SYD
38h 35m2 stops
Multiple Airlines Logo
2:00 pm - 5:00 am
SYD
-
BOS
31h 00m2 stops
$926Multiple Airlines
Sat, Jan 31 - Thu, Feb 5
Multiple Airlines Logo
6:00 am - 12:35 pm
BOS
-
SYD
38h 35m2 stops
Multiple Airlines Logo
2:00 pm - 5:00 am
SYD
-
BOS
31h 00m2 stops
$928Multiple Airlines
Mon, Feb 2 - Mon, Feb 9
Qantas Airways Logo
9:00 am - 9:00 am
BOS
-
SYD
32h 00m1 stop
Qantas Airways Logo
7:05 am - 6:40 pm
SYD
-
BOS
27h 35m2 stops
$933Qantas Airways
Thu, Feb 26 - Tue, Mar 3
Qantas Airways Logo
4:50 pm - 9:00 am
BOS
-
SYD
24h 10m1 stop
Qantas Airways Logo
7:05 am - 6:40 pm
SYD
-
BOS
27h 35m2 stops
$936Qantas Airways
Thu, Feb 26 - Tue, Mar 3
Multiple Airlines Logo
2:00 pm - 12:35 pm
BOS
-
SYD
30h 35m2 stops
Multiple Airlines Logo
6:00 am - 5:30 am
SYD
-
BOS
39h 30m2 stops
$938Multiple Airlines
Tue, Feb 3 - Fri, Feb 13
Qantas Airways Logo
5:20 pm - 9:00 am
BOS
-
SYD
23h 40m1 stop
Qantas Airways Logo
7:05 am - 6:40 pm
SYD
-
BOS
27h 35m2 stops
$939Qantas Airways
Wed, Feb 11 - Wed, Feb 25
Multiple Airlines Logo
6:00 am - 12:35 pm
BOS
-
SYD
38h 35m2 stops
Multiple Airlines Logo
2:00 pm - 5:00 am
SYD
-
BOS
31h 00m2 stops
$941Multiple Airlines
Mon, Feb 2 - Mon, Feb 9
Multiple Airlines Logo
6:12 am - 12:35 pm
BOS
-
SYD
38h 23m2 stops
Multiple Airlines Logo
2:00 pm - 5:00 am
SYD
-
BOS
31h 00m2 stops
$948Multiple Airlines
Sun, Feb 15 - Mon, Mar 2
Qantas Airways Logo
5:20 pm - 9:00 am
BOS
-
SYD
23h 40m1 stop
Qantas Airways Logo
7:15 pm - 5:56 pm
SYD
-
BOS
38h 41m2 stops
$955Qantas Airways
Fri, Jan 30 - Wed, Feb 4

Qantas Airways flights from Boston to Sydney

Our best Qantas Airways deals on Boston to Sydney flight tickets
Qantas Airways
Feb 15
BOS7:15 amBoston Logan Intl
33h 45m
1 stop
SYD9:00 amSydney Kingsford Smith
Mar 2
SYD5:50 pmSydney Kingsford Smith
40h 50m
2 stops
BOS6:40 pmBoston Logan Intl
$917
Find similar
Qantas Airways
Feb 26
BOS9:00 amBoston Logan Intl
32h 00m
1 stop
SYD9:00 amSydney Kingsford Smith
Mar 3
SYD7:05 amSydney Kingsford Smith
27h 35m
2 stops
BOS6:40 pmBoston Logan Intl
$933
Find similar
Qantas Airways
Feb 26
BOS4:50 pmBoston Logan Intl
24h 10m
1 stop
SYD9:00 amSydney Kingsford Smith
Mar 3
SYD7:05 amSydney Kingsford Smith
27h 35m
2 stops
BOS6:40 pmBoston Logan Intl
$936
Find similar

Air Canada flights from Boston to Sydney

Our best Air Canada deals on Boston to Sydney flight tickets
Air Canada
Mar 24
BOS3:35 pmBoston Logan Intl
26h 00m
2 stops
SYD8:35 amSydney Kingsford Smith
Apr 7
SYD9:20 amSydney Kingsford Smith
26h 07m
2 stops
BOS9:27 pmBoston Logan Intl
$1,088
Find similar
Air Canada
Feb 11
BOS6:15 amBoston Logan Intl
35h 20m
2 stops
SYD9:35 amSydney Kingsford Smith
Feb 25
SYD11:20 amSydney Kingsford Smith
24h 22m
2 stops
BOS7:42 pmBoston Logan Intl
$1,093
Find similar
Air Canada
Feb 1
BOS3:35 pmBoston Logan Intl
26h 00m
2 stops
SYD9:35 amSydney Kingsford Smith
Feb 4
SYD11:20 amSydney Kingsford Smith
38h 12m
3 stops
BOS9:32 amBoston Logan Intl
$1,096
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Boston to Sydney that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated January 7, 2026.
Use the filters below to find and compare flights from Boston to Sydney that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 2/15

7:15 am-9:00 am

1 stop33h 45m

Sydney Kingsford Smith

Mon 3/2

5:50 pm-6:40 pm

2 stops40h 50m

$917

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sat 1/31

6:00 am-12:35 pm

2 stops38h 35m

Sydney Kingsford Smith

Thu 2/5

2:00 pm-5:00 am

2 stops31h 00m

$926

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 2/2

6:00 am-12:35 pm

2 stops38h 35m

Sydney Kingsford Smith

Mon 2/9

2:00 pm-5:00 am

2 stops31h 00m

$928

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Thu 2/26

9:00 am-9:00 am

1 stop32h 00m

Sydney Kingsford Smith

Tue 3/3

7:05 am-6:40 pm

2 stops27h 35m

$933

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Thu 2/26

4:50 pm-9:00 am

1 stop24h 10m

Sydney Kingsford Smith

Tue 3/3

7:05 am-6:40 pm

2 stops27h 35m

$936

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Tue 2/3

2:00 pm-12:35 pm

2 stops30h 35m

Sydney Kingsford Smith

Fri 2/13

6:00 am-5:30 am

2 stops39h 30m

$938

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Wed 2/11

5:20 pm-9:00 am

1 stop23h 40m

Sydney Kingsford Smith

Wed 2/25

7:05 am-6:40 pm

2 stops27h 35m

$939

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 2/2

6:00 am-12:35 pm

2 stops38h 35m

Sydney Kingsford Smith

Mon 2/9

2:00 pm-5:00 am

2 stops31h 00m

$941

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sun 2/15

6:12 am-12:35 pm

2 stops38h 23m

Sydney Kingsford Smith

Mon 3/2

2:00 pm-5:00 am

2 stops31h 00m

$948

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Fri 1/30

5:20 pm-9:00 am

1 stop23h 40m

Sydney Kingsford Smith

Wed 2/4

7:15 pm-5:56 pm

2 stops38h 41m

$955

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Sydney from

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

What is the cheapest month to fly to Sydney?

In general, March is the cheapest month to fly from Boston to Sydney. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $1,195. If you are unable to visit Sydney during the month of March, then departing from Boston during the month September is also very affordable. Most momondo users find prices during this month for around $1,215.

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 $1,415 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Sydney from Boston for as low as $1,237 on momondo.

Can stopping save me money on Boston to Sydney flights?

You could potentially save up to 2% 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 January 2026, prices for Boston to Sydney flights are approximately 23% 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 round-trip 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 40m

Direct flights

None
The fastest flight from Boston to Sydney takes 23h 40m
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?

    Boston Logan Intl and Sydney Kingsford Smith are 10084.4 mi apart from one another. Typically, this will take 23h 40m 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 were last updated today.

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

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

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. 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 necessary travel and health documents for your Sydney Kingsford Smith Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from Boston to Sydney?

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
JetBluePriceFrom $248Free CancellationRating
7.2
2,896 reviews
Search JetBlue flights
DeltaPriceFrom $318Free CancellationRating
7.9
8,023 reviews
Search Delta flights
Air CanadaPriceFrom $735Free CancellationRating
7.1
10,600 reviews
Search Air Canada flights
Fiji AirwaysPriceFrom $765Free CancellationRating
8.0
216 reviews
Search Fiji Airways flights
United AirlinesPriceFrom $824Free CancellationRating
7.4
9,138 reviews
Search United Airlines flights
American AirlinesPriceFrom $848Free CancellationRating
7.2
11,091 reviews
Search American Airlines flights
Qantas AirwaysPriceFrom $1,089Free CancellationRating
7.5
967 reviews
Search Qantas Airways flights
Air New ZealandPriceFrom $1,228Free CancellationRating
8.0
565 reviews
Search Air New Zealand flights
Qatar AirwaysPriceFrom $1,295Free CancellationRating
7.4
3,701 reviews
Search Qatar Airways flights
Cathay PacificPriceFrom $1,318Free CancellationRating
7.6
1,124 reviews
Search Cathay Pacific flights

Traveling to a place near Sydney?

Book flights to Sydney if you plan to visit one of these locations
Parramatta
Bondi Beach
Katoomba
Wollongong
Randwick
Coogee
Manly
Cronulla
Lithgow
Penrith
Leura
Charlestown
Terrigal
Swansea

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Boston to Sydney for you.

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

Yes. All flights to Sydney from Boston on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

momondo provides multiple filters to help you find the best flight to Sydney from Boston. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

Yes. momondo can track prices for Boston 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.

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