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Cheap flights from Boston to Sydney from $471

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 2/25. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Boston to Sydney

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
6:15 am - 12:35 pm
BOS
-
SYD
38h 20m
2 stops
Multiple Airlines Logo
6:00 am - 6:20 am
SYD
-
BOS
39h 20m
2 stops
$945Multiple Airlines
mar., mar. 3 - mar., mar. 17
Multiple Airlines Logo
6:15 am - 8:50 pm
BOS
-
SYD
46h 35m
2 stops
Multiple Airlines Logo
11:20 am - 6:20 am
SYD
-
BOS
34h 00m
1 stop
$1,009Multiple Airlines
mar., mar. 3 - mar., mar. 17
Multiple Airlines Logo
3:50 pm - 11:45 am
BOS
-
SYD
29h 55m
2 stops
Multiple Airlines Logo
1:15 pm - 6:08 am
SYD
-
BOS
30h 53m
2 stops
$1,034Multiple Airlines
dom., may. 10 - dom., may. 24
Multiple Airlines Logo
6:50 am - 11:45 am
BOS
-
SYD
38h 55m
2 stops
Multiple Airlines Logo
6:00 am - 7:33 am
SYD
-
BOS
39h 33m
2 stops
$1,063Multiple Airlines
dom., may. 3 - dom., may. 17
Air Canada Logo
10:15 am - 8:35 am
BOS
-
SYD
31h 20m
2 stops
Air Canada Logo
9:20 am - 9:27 pm
SYD
-
BOS
26h 07m
2 stops
$1,082Air Canada
mar., mar. 24 - mar., abr. 7
Air Canada Logo
5:50 am - 7:20 am
BOS
-
SYD
35h 30m
2 stops
Air Canada Logo
9:20 am - 9:45 am
SYD
-
BOS
38h 25m
2 stops
$1,085Air Canada
lun., may. 11 - dom., may. 31
Air Canada Logo
10:15 am - 9:35 am
BOS
-
SYD
31h 20m
2 stops
Air Canada Logo
10:20 am - 10:37 pm
SYD
-
BOS
27h 17m
2 stops
$1,087Air Canada
mar., mar. 3 - mié., mar. 11
Air Canada Logo
6:55 pm - 7:20 am
BOS
-
SYD
46h 25m
2 stops
Air Canada Logo
9:20 am - 9:45 am
SYD
-
BOS
38h 25m
2 stops
$1,088Air Canada
sáb., may. 16 - lun., may. 25
Air Canada Logo
3:35 pm - 9:35 am
BOS
-
SYD
26h 00m
2 stops
Air Canada Logo
10:20 am - 9:32 am
SYD
-
BOS
38h 12m
3 stops
$1,090Air Canada
mar., mar. 3 - mar., mar. 17
Air Canada Logo
10:35 am - 7:20 am
BOS
-
SYD
30h 45m
3 stops
Air Canada Logo
9:20 am - 9:45 am
SYD
-
BOS
38h 25m
2 stops
$1,092Air Canada
dom., may. 3 - dom., may. 17

Air New Zealand flights from Boston to Sydney

Our best Air New Zealand deals on Boston to Sydney flight tickets
Air New Zealand
Mar 4
BOS3:35 pmBoston Logan Intl
26h 00m
2 stops
SYD9:35 amSydney Kingsford Smith
Mar 17
SYD10:20 amSydney Kingsford Smith
27h 17m
2 stops
BOS10:37 pmBoston Logan Intl
$1,116
Air New Zealand
Jan 28
BOS6:17 pmBoston Logan Intl
22h 48m
1 stop
SYD9:05 amSydney Kingsford Smith
Jul 4
SYD10:20 amSydney Kingsford Smith
28h 46m
1 stop
BOS1:06 amBoston Logan Intl
$1,542

Qantas Airways flights from Boston to Sydney

Our best Qantas Airways deals on Boston to Sydney flight tickets
Qantas Airways
Mar 3
BOS9:00 amBoston Logan Intl
43h 50m
2 stops
SYD8:50 pmSydney Kingsford Smith
Mar 11
SYD5:45 pmSydney Kingsford Smith
27h 46m
1 stop
BOS6:31 amBoston Logan Intl
$1,162
Qantas Airways
Mar 24
BOS5:20 pmBoston Logan Intl
24h 40m
1 stop
SYD9:00 amSydney Kingsford Smith
Apr 7
SYD9:10 amSydney Kingsford Smith
25h 38m
1 stop
BOS8:48 pmBoston Logan Intl
$1,193
Qantas Airways
Mar 4
BOS2:36 pmBoston Logan Intl
24h 19m
1 stop
SYD6:55 amSydney Kingsford Smith
Mar 15
SYD11:20 amSydney Kingsford Smith
26h 39m
1 stop
BOS10:59 pmBoston Logan Intl
$1,195

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 enero 20, 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

mar. 3/3

6:15 am-12:35 pm

2 stops38h 20m

Sydney Kingsford Smith

mar. 3/17

6:00 am-6:20 am

2 stops39h 20m

$945

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

mar. 3/3

6:15 am-8:50 pm

2 stops46h 35m

Sydney Kingsford Smith

mar. 3/17

11:20 am-6:20 am

1 stop34h 00m

$1,009

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

dom. 5/10

3:50 pm-11:45 am

2 stops29h 55m

Sydney Kingsford Smith

dom. 5/24

1:15 pm-6:08 am

2 stops30h 53m

$1,034

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

dom. 5/3

6:50 am-11:45 am

2 stops38h 55m

Sydney Kingsford Smith

dom. 5/17

6:00 am-7:33 am

2 stops39h 33m

$1,063

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

mar. 3/24

10:15 am-8:35 am

2 stops31h 20m

Sydney Kingsford Smith

mar. 4/7

9:20 am-9:27 pm

2 stops26h 07m

$1,082

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

lun. 5/11

5:50 am-7:20 am

2 stops35h 30m

Sydney Kingsford Smith

dom. 5/31

9:20 am-9:45 am

2 stops38h 25m

$1,085

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

mar. 3/3

10:15 am-9:35 am

2 stops31h 20m

Sydney Kingsford Smith

mié. 3/11

10:20 am-10:37 pm

2 stops27h 17m

$1,087

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

sáb. 5/16

6:55 pm-7:20 am

2 stops46h 25m

Sydney Kingsford Smith

lun. 5/25

9:20 am-9:45 am

2 stops38h 25m

$1,088

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

mar. 3/3

3:35 pm-9:35 am

2 stops26h 00m

Sydney Kingsford Smith

mar. 3/17

10:20 am-9:32 am

3 stops38h 12m

$1,090

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

dom. 5/3

10:35 am-7:20 am

3 stops30h 45m

Sydney Kingsford Smith

dom. 5/17

9:20 am-9:45 am

2 stops38h 25m

$1,092

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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, September 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 $1,215. If you are unable to visit Sydney during the month of September, then departing from Boston during the month March is also very affordable. Most momondo users find prices during this month for around $1,216.

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 $1,420 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 8% 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 19% 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

26h 20m

Direct flights

None
The fastest flight from Boston to Sydney takes 26h 20m
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 26h 20m 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 $251Free CancellationRating
7.2
2,891 reviews
Search JetBlue flights
DeltaPriceFrom $318Free CancellationRating
7.9
8,085 reviews
Search Delta flights
Air CanadaPriceFrom $735Free CancellationRating
7.1
10,644 reviews
Search Air Canada flights
Fiji AirwaysPriceFrom $765Free CancellationRating
8.0
217 reviews
Search Fiji Airways flights
United AirlinesPriceFrom $824Free CancellationRating
7.4
9,189 reviews
Search United Airlines flights
Air New ZealandPriceFrom $839Free CancellationRating
8.0
572 reviews
Search Air New Zealand flights
American AirlinesPriceFrom $848Free CancellationRating
7.2
11,169 reviews
Search American Airlines flights
Qantas AirwaysPriceFrom $1,087Free CancellationRating
7.5
973 reviews
Search Qantas Airways flights
Qatar AirwaysPriceFrom $1,295Free CancellationRating
7.4
3,721 reviews
Search Qatar Airways flights
Cathay PacificPriceFrom $1,318Free CancellationRating
7.6
1,140 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
Lithgow
Leura
Penrith
Cronulla
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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