Cheap flights from Boston to Sydney from $732
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 26/8. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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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?
The month of April is, on average, the cheapest month to fly to Sydney from Boston, with most prices found around $1,935. 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 $1,945.
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 $2,070. The most expensive day to fly to Sydney is Friday, with ticket prices averaging around $2,476.
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 $2,069. 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 $3,003 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 $2,188 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 $1,948 on momondo.
Can stopping save me money on Boston to Sydney flights?
You could potentially save up to 21% 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 June 2025, prices for Boston to Sydney flights are approximately 20% cheaper when compared to flights at the same time last year.
What is the cheapest airline that flies from Boston Logan Intl to Sydney Kingsford Smith?
Air Canada, Qantas Airways, and Fiji Airways are the most popular carriers operating from Boston Logan Intl to Sydney Kingsford Smith
Which airlines fly to Sydney?
United Airlines, Qantas Airways and Air Canada are the top three most popular airlines that fly to Sydney from Boston according to our data. United Airlines is the first choice among our users, with 50% of people opting to fly with this airline when travelling to Sydney. Keep in mind that there are 3 different airlines that fly to Sydney on a routine basis, so you have a few additional options to choose from.
When to book flights from Boston to Sydney
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
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 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 refresh daily.
How many operators does momondo search for flights from Boston Logan Intl Airport to Sydney Kingsford Smith Airport?
There are 3 operators available for flights from Boston Logan Intl Airport to Sydney Kingsford Smith Airport as of June 2025.
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?
Based on momondo bookings for flights between Boston and Sydney, the leading airline is United Airlines, making up 50% of the total bookings. Other popular airlines include Qantas Airways with 26% and Air Canada with 24%.
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 | ||
|---|---|---|---|---|---|
| PriceFrom $1,171 | Free cancellation | Rating 7.1 9,528 reviews | |||
| PriceFrom $1,251 | Free cancellation | Rating 7.4 8,784 reviews | |||
| PriceFrom $2,103 | Free cancellation | Rating 7.5 854 reviews |
Travelling to a place near Sydney?
Book flights to Sydney if you plan to visit one of these locationsWhy 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.