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Cheap flights from Boston to Sydney from $913

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 16/11. 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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Cheap return flights

Enter your travel dates to find the best prices.
Alaska Airlines Logo
18:52 - 19:45BOS-SYD
32h 53m2 stops
Alaska Airlines Logo
21:40 - 17:20SYD-BOS
35h 40m2 stops
$1,829Alaska Airlines
Find Deal
Fri, 5 Dec - Thu, 11 Dec
Alaska Airlines Logo
18:52 - 19:45BOS-SYD
56h 53m2 stops
Alaska Airlines Logo
21:40 - 07:29SYD-BOS
25h 49m2 stops
$1,832Alaska Airlines
Find Deal
Sat, 6 Dec - Fri, 12 Dec
Alaska Airlines Logo
18:59 - 19:45BOS-SYD
56h 46m2 stops
Alaska Airlines Logo
21:40 - 15:37SYD-BOS
33h 57m2 stops
$1,848Alaska Airlines
Find Deal
Thu, 4 Dec - Fri, 12 Dec
American Airlines Logo
14:49 - 09:00BOS-SYD
26h 11m2 stops
American Airlines Logo
11:20 - 20:19SYD-BOS
24h 59m2 stops
$1,916American Airlines
Find Deal
Mon, 1 Dec - Mon, 22 Dec
American Airlines Logo
12:00 - 09:00BOS-SYD
29h 00m1 stop
American Airlines Logo
14:05 - 21:33SYD-BOS
23h 28m1 stop
$1,918American Airlines
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Mon, 1 Dec - Mon, 22 Dec
United Airlines Logo
18:20 - 08:00BOS-SYD
22h 40m1 stop
United Airlines Logo
12:10 - 18:06SYD-BOS
20h 56m1 stop
$1,945United Airlines
Find Deal
Mon, 20 Oct - Sun, 2 Nov
United Airlines Logo
15:15 - 09:05BOS-SYD
25h 50m2 stops
United Airlines Logo
12:10 - 18:48SYD-BOS
22h 38m2 stops
$1,954United Airlines
Find Deal
Mon, 1 Dec - Mon, 22 Dec
Turkish Airlines Logo
20:00 - 19:20BOS-SYD
31h 20m2 stops
Turkish Airlines Logo
21:15 - 18:05SYD-BOS
36h 50m2 stops
$2,016Turkish Airlines
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Wed, 5 Nov - Fri, 16 Jan
Turkish Airlines Logo
21:00 - 19:20BOS-SYD
31h 20m2 stops
Turkish Airlines Logo
21:15 - 18:05SYD-BOS
36h 50m2 stops
$2,029Turkish Airlines
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Thu, 30 Oct - Tue, 4 Nov
Air Canada Logo
10:15 - 08:35BOS-SYD
31h 20m3 stops
Air Canada Logo
09:20 - 21:27SYD-BOS
26h 07m2 stops
$2,083Air Canada
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Tue, 24 Mar - Tue, 7 Apr

Alaska Airlines flights from Boston to Sydney

Our best Alaska Airlines deals on Boston to Sydney flight tickets
Alaska Airlines
5 Dec
BOS18:52Boston Logan Intl
32h 53m
2 stops
SYD19:45Sydney Kingsford Smith
11 Dec
SYD21:40Sydney Kingsford Smith
35h 40m
2 stops
BOS17:20Boston Logan Intl
$1,829
Find similar
Alaska Airlines
6 Dec
BOS18:52Boston Logan Intl
56h 53m
2 stops
SYD19:45Sydney Kingsford Smith
12 Dec
SYD21:40Sydney Kingsford Smith
25h 49m
2 stops
BOS07:29Boston Logan Intl
$1,832
Find similar
Alaska Airlines
4 Dec
BOS18:59Boston Logan Intl
56h 46m
2 stops
SYD19:45Sydney Kingsford Smith
12 Dec
SYD21:40Sydney Kingsford Smith
33h 57m
2 stops
BOS15:37Boston Logan Intl
$1,848
Find similar

American Airlines flights from Boston to Sydney

Our best American Airlines deals on Boston to Sydney flight tickets
American Airlines
1 Dec
BOS14:49Boston Logan Intl
26h 11m
2 stops
SYD09:00Sydney Kingsford Smith
22 Dec
SYD11:20Sydney Kingsford Smith
24h 59m
2 stops
BOS20:19Boston Logan Intl
$1,916
Find similar
American Airlines
1 Dec
BOS12:00Boston Logan Intl
29h 00m
1 stop
SYD09:00Sydney Kingsford Smith
22 Dec
SYD14:05Sydney Kingsford Smith
23h 28m
1 stop
BOS21:33Boston Logan Intl
$1,918
Find similar
American Airlines
2 Dec
BOS17:45Boston Logan Intl
23h 15m
1 stop
SYD09:00Sydney Kingsford Smith
17 Dec
SYD11:20Sydney Kingsford Smith
26h 59m
1 stop
BOS22:19Boston Logan Intl
$1,930
Find similar

momondo Fare Finder

 
Customise 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 78,305 searches. Data last updated 3 October 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 5/12

18:52-19:45

2 stops32h 53m

Sydney Kingsford Smith

Thu 11/12

21:40-17:20

2 stops35h 40m

$1,829

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Sat 6/12

18:52-19:45

2 stops56h 53m

Sydney Kingsford Smith

Fri 12/12

21:40-07:29

2 stops25h 49m

$1,832

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Thu 4/12

18:59-19:45

2 stops56h 46m

Sydney Kingsford Smith

Fri 12/12

21:40-15:37

2 stops33h 57m

$1,848

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 1/12

14:49-09:00

2 stops26h 11m

Sydney Kingsford Smith

Mon 22/12

11:20-20:19

2 stops24h 59m

$1,916

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 1/12

12:00-09:00

1 stop29h 00m

Sydney Kingsford Smith

Mon 22/12

14:05-21:33

1 stop23h 28m

$1,918

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 20/10

18:20-08:00

1 stop22h 40m

Sydney Kingsford Smith

Sun 2/11

12:10-18:06

1 stop20h 56m

$1,945

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Mon 1/12

15:15-09:05

2 stops25h 50m

Sydney Kingsford Smith

Mon 22/12

12:10-18:48

2 stops22h 38m

$1,954

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Wed 5/11

20:00-19:20

2 stops31h 20m

Sydney Kingsford Smith

Fri 16/1

21:15-18:05

2 stops36h 50m

$2,016

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Thu 30/10

21:00-19:20

2 stops31h 20m

Sydney Kingsford Smith

Tue 4/11

21:15-18:05

2 stops36h 50m

$2,028

BostonSydney

BOS - SYD

BOSSYD

Boston Logan Intl

Tue 24/3

10:15-08:35

3 stops31h 20m

Sydney Kingsford Smith

Tue 7/4

09:20-21:27

2 stops26h 07m

$2,083

Flights are sorted by cheapest return 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?

The month of September is, on average, the cheapest month to fly to Sydney from Boston, with most prices found around $1,882. 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 $1,903.

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

Our data shows that Tuesday is the least expensive day to fly to Sydney. Tickets to fly out on this day can be as low as $2,041. The most expensive day to fly to Sydney is Friday, with ticket prices averaging around $2,441.

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 evening. momondo users have found flights departing from Boston to Sydney in the evening for as low as $2,040. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are $2,960 on average. Flights to Sydney from Boston in the morning are generally more expensive because this time of day is more convenient for travellers’ schedules.

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 $2,168 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 $1,986 on momondo.

Can stopping save me money on Boston to Sydney flights?

You could potentially save up to 23% 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 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

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?

    The straight-line distance from Boston Logan Intl to Sydney Kingsford Smith is 16229.2 km. Typically, this will take 22h 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 refresh daily.

  • 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?

    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?

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
Air CanadaPriceFrom $1,154Free cancellationRating
7.1
10,000 reviews
Search Air Canada flights
United AirlinesPriceFrom $1,234Free cancellationRating
7.4
8,940 reviews
Search United Airlines flights
Qantas AirwaysPriceFrom $2,074Free cancellationRating
7.6
910 reviews
Search Qantas Airways flights

Travelling to a place near Sydney?

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

An easier way to manage your Sydney trip

We make it super easy to schedule, organise and travel with friends or family. Trips is free – and available to use no matter where you book.
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