Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Boston to Sydney from $807

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 21/8. 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

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names, great deals

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customise your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.

Find the cheapest flights from Boston to Sydney

Cheap return flights

KAYAK's recommended return flight deals from the most popular airlines that fly from Boston to Sydney.
 Logo
08:00 - 14:40BOS-SYD
40h 40m1 stop
 Logo
16:20 - 05:03SYD-BOS
26h 43m2 stops
$1,909
Find Deal
Thu, 21 Aug - Sun, 24 Aug
Air New Zealand Logo
16:20 - 08:45BOS-SYD
26h 25m2 stops
Air New Zealand Logo
11:50 - 07:18SYD-BOS
33h 28m2 stops
$1,943Air New Zealand
Find Deal
Mon, 25 Aug - Sun, 7 Sep
Cathay Pacific Logo
01:40 - 20:10BOS-SYD
28h 30m1 stop
Cathay Pacific Logo
07:40 - 23:00SYD-BOS
29h 20m1 stop
$2,066Cathay Pacific
Find Deal
Tue, 26 Aug - Thu, 11 Sep
Air Canada Logo
15:20 - 08:20BOS-SYD
26h 00m2 stops
Air Canada Logo
10:20 - 20:18SYD-BOS
24h 58m2 stops
$2,214Air Canada
Find Deal
Mon, 20 Oct - Mon, 27 Oct
Air Canada Logo
10:20 - 08:20BOS-SYD
31h 00m2 stops
Air Canada Logo
11:20 - 09:38SYD-BOS
38h 18m3 stops
$2,221Air Canada
Find Deal
Tue, 7 Oct - Tue, 4 Nov
Qantas Airways Logo
08:05 - 07:05BOS-SYD
33h 00m1 stop
Qantas Airways Logo
17:45 - 07:05SYD-BOS
27h 20m1 stop
$2,258Qantas Airways
Find Deal
Sun, 29 Jun - Mon, 7 Jul
Qantas Airways Logo
08:05 - 07:05BOS-SYD
33h 00m1 stop
Qantas Airways Logo
17:45 - 07:05SYD-BOS
27h 20m1 stop
$2,266Qantas Airways
Find Deal
Sun, 6 Jul - Sun, 27 Jul
Cathay Pacific Logo
01:40 - 20:45BOS-SYD
28h 05m1 stop
Cathay Pacific Logo
22:20 - 22:00SYD-BOS
39h 40m1 stop
$2,280Cathay Pacific
Find Deal
Mon, 20 Oct - Tue, 4 Nov
United Airlines Logo
18:18 - 07:55BOS-SYD
22h 37m1 stop
United Airlines Logo
11:20 - 18:44SYD-BOS
23h 24m2 stops
$2,440United Airlines
Find Deal
Mon, 20 Oct - Tue, 4 Nov
United Airlines Logo
13:30 - 07:00BOS-SYD
27h 30m2 stops
United Airlines Logo
09:30 - 22:00SYD-BOS
26h 30m2 stops
$2,499United Airlines
Find Deal
Sun, 8 Jun - Wed, 2 Jul

JetBlue flights from Boston to Sydney

Our best JetBlue deals on Boston to Sydney flight tickets
JetBlue
12 May
BOS22:00Boston Logan Intl
29h 10m
1 stop
SYD17:10Sydney Kingsford Smith
19 May
SYD20:45Sydney Kingsford Smith
32h 20m
1 stop
BOS15:05Boston Logan Intl
JetBlue
9 May
BOS22:00Boston Logan Intl
29h 10m
1 stop
SYD17:10Sydney Kingsford Smith
12 May
SYD20:45Sydney Kingsford Smith
32h 20m
1 stop
BOS15:05Boston Logan Intl
JetBlue
3 May
BOS22:00Boston Logan Intl
29h 10m
1 stop
SYD17:10Sydney Kingsford Smith
10 May
SYD20:45Sydney Kingsford Smith
32h 20m
1 stop
BOS15:05Boston Logan Intl

Alaska Airlines flights from Boston to Sydney

Our best Alaska Airlines deals on Boston to Sydney flight tickets
Alaska Airlines
22 Oct
BOS18:20Boston Logan Intl
34h 25m
2 stops
SYD19:45Sydney Kingsford Smith
1 Nov
SYD21:40Sydney Kingsford Smith
35h 26m
2 stops
BOS18:06Boston Logan Intl
Alaska Airlines
21 Oct
BOS18:20Boston Logan Intl
34h 25m
2 stops
SYD19:45Sydney Kingsford Smith
6 Nov
SYD21:40Sydney Kingsford Smith
35h 26m
2 stops
BOS17:06Boston Logan Intl
Alaska Airlines
20 Aug
BOS20:23Boston Logan Intl
33h 22m
2 stops
SYD19:45Sydney Kingsford Smith
24 Aug
SYD21:40Sydney Kingsford Smith
31h 37m
1 stop
BOS15:17Boston Logan Intl

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?

The month of April is, on average, the cheapest month to fly to Sydney from Boston, with most prices found around $1,983. If you aren’t able to travel to Sydney during the month of April, then flying in March is also cheap. Prices for this month can be found on momondo for an average of $2,012.

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

Our data shows that Thursday is the least expensive day to fly to Sydney. Tickets to fly out on this day can be as low as $0. The most expensive day to fly to Sydney is Friday, with ticket prices averaging around $2,525.

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 $2,110. 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 $3,063 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 9 weeks ahead of your departure date. In general, you can expect to find flights to Sydney for around $2,305 when searching 9 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 $2,023 on momondo.

How have Boston to Sydney flight prices changed over time?

As of April 2025, prices for Boston to Sydney flights are approximately 30% 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

Best price found

$807

Fastest flight time

22h 35m

Direct flights

None

Airports in Sydney

1 airport
The best one-way flight to Sydney from Boston in the past 72 hours is $807. The best return flight deal from Boston to Sydney found on momondo in the last 72 hours is $1,909.
The fastest flight from Boston to Sydney takes 22h 35m
There are no direct flights from Boston to Sydney. Popular non-direct route for this connection is Boston Logan Intl Airport - Sydney Kingsford Smith Airport.
There is 1 airport near Sydney: Sydney Kingsford Smith (SYD)

  • 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 35m 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 $1,194Free cancellationRating
7.0
9,206 reviews
Search Air Canada flights
United AirlinesPriceFrom $1,276Free cancellationRating
7.4
8,685 reviews
Search United Airlines flights
Qantas AirwaysPriceFrom $2,145Free cancellationRating
7.5
828 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
Katoomba
Lithgow
Penrith
Leura
Coogee
Manly
Cronulla
Bondi Beach
Randwick
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.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
From?
To?
Wed 30/4
Wed 7/5

Find better results for your trip to Australia