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Cheap flights from Boston to Sydney from $603

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 11/16. 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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Cheap round-trip flights

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Alaska Airlines Logo
6:52 pm - 7:45 pmBOS-SYD
32h 53m2 stops
Alaska Airlines Logo
9:40 pm - 5:20 pmSYD-BOS
35h 40m2 stops
$1,208Alaska Airlines
Find Deal
Fri, Dec 5 - Thu, Dec 11
Alaska Airlines Logo
6:52 pm - 7:45 pmBOS-SYD
56h 53m2 stops
Alaska Airlines Logo
9:40 pm - 7:29 amSYD-BOS
25h 49m2 stops
$1,210Alaska Airlines
Find Deal
Sat, Dec 6 - Fri, Dec 12
Alaska Airlines Logo
6:59 pm - 7:45 pmBOS-SYD
56h 46m2 stops
Alaska Airlines Logo
9:40 pm - 3:37 pmSYD-BOS
33h 57m2 stops
$1,221Alaska Airlines
Find Deal
Thu, Dec 4 - Fri, Dec 12
Alaska Airlines Logo
6:52 pm - 7:45 pmBOS-SYD
56h 53m2 stops
Alaska Airlines Logo
9:40 pm - 5:20 pmSYD-BOS
35h 40m2 stops
$1,231Alaska Airlines
Find Deal
Thu, Dec 4 - Thu, Dec 11
American Airlines Logo
2:49 pm - 9:00 amBOS-SYD
26h 11m2 stops
American Airlines Logo
11:20 am - 8:19 pmSYD-BOS
24h 59m2 stops
$1,266American Airlines
Find Deal
Mon, Dec 1 - Mon, Dec 22
American Airlines Logo
12:00 pm - 9:00 amBOS-SYD
29h 00m1 stop
American Airlines Logo
2:05 pm - 9:33 pmSYD-BOS
23h 28m1 stop
$1,267American Airlines
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Mon, Dec 1 - Mon, Dec 22
United Airlines Logo
3:31 pm - 8:00 amBOS-SYD
25h 29m2 stops
United Airlines Logo
12:10 pm - 10:49 pmSYD-BOS
25h 39m2 stops
$1,285United Airlines
Find Deal
Mon, Oct 20 - Sun, Nov 2
United Airlines Logo
3:15 pm - 9:05 amBOS-SYD
25h 50m2 stops
United Airlines Logo
12:10 pm - 6:48 pmSYD-BOS
22h 38m2 stops
$1,291United Airlines
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Mon, Dec 1 - Mon, Dec 22
Fiji Airways Logo
2:11 pm - 9:50 pmBOS-SYD
39h 39m2 stops
Fiji Airways Logo
6:00 am - 11:30 pmSYD-BOS
33h 30m2 stops
$1,372Fiji Airways
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Sat, Jan 17 - Sat, Jan 31
Air Canada Logo
10:15 am - 8:35 amBOS-SYD
31h 20m3 stops
Air Canada Logo
9:20 am - 9:27 pmSYD-BOS
26h 07m2 stops
$1,376Air Canada
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Tue, Mar 24 - Tue, Apr 7

Alaska Airlines flights from Boston to Sydney

Our best Alaska Airlines deals on Boston to Sydney flight tickets
Alaska Airlines
Dec 5
BOS6:52 pmBoston Logan Intl
32h 53m
2 stops
SYD7:45 pmSydney Kingsford Smith
Dec 11
SYD9:40 pmSydney Kingsford Smith
35h 40m
2 stops
BOS5:20 pmBoston Logan Intl
$1,208
Find similar
Alaska Airlines
Dec 6
BOS6:52 pmBoston Logan Intl
56h 53m
2 stops
SYD7:45 pmSydney Kingsford Smith
Dec 12
SYD9:40 pmSydney Kingsford Smith
25h 49m
2 stops
BOS7:29 amBoston Logan Intl
$1,210
Find similar
Alaska Airlines
Dec 4
BOS6:59 pmBoston Logan Intl
56h 46m
2 stops
SYD7:45 pmSydney Kingsford Smith
Dec 12
SYD9:40 pmSydney Kingsford Smith
33h 57m
2 stops
BOS3:37 pmBoston Logan Intl
$1,221
Find similar

American Airlines flights from Boston to Sydney

Our best American Airlines deals on Boston to Sydney flight tickets
American Airlines
Dec 1
BOS2:49 pmBoston Logan Intl
26h 11m
2 stops
SYD9:00 amSydney Kingsford Smith
Dec 22
SYD11:20 amSydney Kingsford Smith
24h 59m
2 stops
BOS8:19 pmBoston Logan Intl
$1,266
Find similar
American Airlines
Dec 1
BOS12:00 pmBoston Logan Intl
29h 00m
1 stop
SYD9:00 amSydney Kingsford Smith
Dec 22
SYD2:05 pmSydney Kingsford Smith
23h 28m
1 stop
BOS9:33 pmBoston Logan Intl
$1,267
Find similar
American Airlines
Dec 2
BOS5:45 pmBoston Logan Intl
23h 15m
1 stop
SYD9:00 amSydney Kingsford Smith
Dec 17
SYD11:20 amSydney Kingsford Smith
26h 59m
1 stop
BOS10:19 pmBoston Logan Intl
$1,275
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 October 3, 2025.
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

Fri 12/5

6:52 pm-7:45 pm

2 stops32h 53m

Sydney Kingsford Smith

Thu 12/11

9:40 pm-5:20 pm

2 stops35h 40m

$1,208

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sat 12/6

6:52 pm-7:45 pm

2 stops56h 53m

Sydney Kingsford Smith

Fri 12/12

9:40 pm-7:29 am

2 stops25h 49m

$1,210

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Thu 12/4

6:59 pm-7:45 pm

2 stops56h 46m

Sydney Kingsford Smith

Fri 12/12

9:40 pm-3:37 pm

2 stops33h 57m

$1,221

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Thu 12/4

6:52 pm-7:45 pm

2 stops56h 53m

Sydney Kingsford Smith

Thu 12/11

9:40 pm-5:20 pm

2 stops35h 40m

$1,231

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 12/1

2:49 pm-9:00 am

2 stops26h 11m

Sydney Kingsford Smith

Mon 12/22

11:20 am-8:19 pm

2 stops24h 59m

$1,266

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 12/1

12:00 pm-9:00 am

1 stop29h 00m

Sydney Kingsford Smith

Mon 12/22

2:05 pm-9:33 pm

1 stop23h 28m

$1,267

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 10/20

3:31 pm-8:00 am

2 stops25h 29m

Sydney Kingsford Smith

Sun 11/2

12:10 pm-10:49 pm

2 stops25h 39m

$1,285

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 12/1

3:15 pm-9:05 am

2 stops25h 50m

Sydney Kingsford Smith

Mon 12/22

12:10 pm-6:48 pm

2 stops22h 38m

$1,291

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sat 1/17

2:11 pm-9:50 pm

2 stops39h 39m

Sydney Kingsford Smith

Sat 1/31

6:00 am-11:30 pm

2 stops33h 30m

$1,372

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Tue 3/24

10:15 am-8:35 am

3 stops31h 20m

Sydney Kingsford Smith

Tue 4/7

9:20 am-9:27 pm

2 stops26h 07m

$1,376

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

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 $1,243. 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 $1,257.

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

The cheapest day to depart from Boston to Sydney is on a Wednesday when prices can be found for as low as $1,444. The most expensive day to fly to Sydney is Saturday, with ticket prices averaging around $1,562.

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 morning. momondo users have found flights departing from Boston to Sydney in the morning for as low as $1,438. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights to Sydney are more costly in the evening, with an average ticket price of $1,494. Departure times in the evening fall within the peak daily travel times, which is why tickets can be more expensive.

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 $1,432 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 $1,312 on momondo.

Can stopping save me money on Boston to Sydney flights?

You could potentially save up to 4% 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 October 2025, prices for Boston to Sydney flights are approximately 36% 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

Direct flights

None
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 22h 43m 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
2,911 reviews
Search JetBlue flights
DeltaPriceFrom $418Free CancellationRating
7.9
7,966 reviews
Search Delta flights
Air CanadaPriceFrom $735Free CancellationRating
7.1
10,000 reviews
Search Air Canada flights
United AirlinesPriceFrom $824Free CancellationRating
7.4
8,940 reviews
Search United Airlines flights
Fiji AirwaysPriceFrom $831Free CancellationRating
8.0
205 reviews
Search Fiji Airways flights
American AirlinesPriceFrom $920Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
Qantas AirwaysPriceFrom $1,110Free CancellationRating
7.6
910 reviews
Search Qantas Airways flights
Air New ZealandPriceFrom $1,228Free CancellationRating
7.9
508 reviews
Search Air New Zealand flights
Qatar AirwaysPriceFrom $1,295Free CancellationRating
7.4
3,643 reviews
Search Qatar Airways flights
Cathay PacificPriceFrom $1,334Free CancellationRating
7.6
1,016 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
Cronulla
Coogee
Lithgow
Penrith
Manly
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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