Route brief · BOS → SYD
Boston → Sydney
$1,235
round-trip · too little price history on this route to compare
Apr 19 '27 – Apr 30 '27 · 11 nights
Air Canada2 stops
Cached fare — the booking search re-prices live before you pay.
Destination briefSYDSydneyHarbour sails, cliff walks and flat whites that ruin you for coffee anywhere else.Best windowOct–Nov · Mar–AprAirportsKingsford Smith (SYD)All routes into SydneyWhen this route gets cheap.
Best time to be in Sydney: Oct–Nov · Mar–Apr. Fare history for this route is still thin, so we make no seasonal call yet.
The cheapest itinerary we are tracking makes 2 stops and takes about 22 hours outbound, on a 11-night trip — ticketed under Air Canada, which on a connecting fare need not operate every leg. At $1,235 for 16,240 km each way, that works out to about $38 per 1,000 km flown. That is below the $40 typical of ultra-long-haul fares here. Across the 30 departure cities we track at a similar distance from Sydney, this fare ranks 23rd — 48% above the $833 from Stockholm. For context, the middle fare among the 18 routes of similar length we watch out of Boston is $1,089. We have 1 month of cached prices for this route so far — not enough to call a fare cheap or expensive, so we publish the price without a percentage.
Route facts
- Airports
- Logan (BOS) ↔ Kingsford Smith (SYD)
- Flight time
- ~22 hours outbound
- Distance
- ~16,240 km each way
- Airlines on the board
- Air Canada
- Itineraries
- Connections on current fares
- Best months to visit
- Oct–Nov · Mar–Apr
BOS → SYD, answered.
How far in advance should I book BOS → Sydney?
We do not publish a number for this, because we cannot measure it yet. Answering it honestly means watching the same departure date on this route over many weeks as it approaches, and that archive is still filling up — so any "book N days ahead" figure here would be borrowed from somewhere else rather than measured. See /guides/what-moves-a-flight-price/ for the levers we can measure.
Are there nonstop flights from Boston to Sydney?
The current cheapest fares involve a connection, ticketed under Air Canada. Nonstop options exist on many dates at higher prices — check the live search for your exact dates.
Are these prices guaranteed?
No — these are cached fares found on real searches (this one on August 17). Airlines reprice constantly, so the booking search re-checks the live price before you pay. Fresher finds are far more likely to still be available.
Next step
Sleeping in Sydney?
Lock the flight first — then compare stays for Apr 19 '27 – Apr 30 '27 · 11 nights.
Browse hotels ↗
Missed it?
Cached fares expire. This route has a feed of its own — follow it and the next BOS → SYD drop reaches you as soon as we find it.
Follow BOS → SYD