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SYD to BFI: distance & flight time
Sydney (Sydney Kingsford Smith International Airport) → Seattle (Boeing Field King County International Airport)
7,753 mi
12,477 km · 6,737 nm
15h 40m
estimated nonstop flight time
-17h
time difference · heading northeast
See live SYD→BFI fares Phone-only fares on this route — call free
Flight time details
7,753 miles nonstop takes roughly 15h 40m gate to gate, flying northeast. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 17-hour time set-back when reading arrival times on your ticket.
The two airports
- SYD — Sydney Kingsford Smith International Airport · Sydney, Australia
- BFI — Boeing Field King County International Airport · Seattle, United States
Distances are great-circle ("as the crow flies") — the same basis airlines use for frequent-flyer miles.
Alternate airports can cut this fare
Flying from or into a nearby airport is the #1 trick our agents use to beat online prices. Call and we'll compare every combination on one call.
Near SYD
- BWU · Sydney Bankstown Airport11 mi away
- CDU · Camden Airport29 mi away
- XRH · RAAF Base Richmond33 mi away
- WOL · Wollongong Airport48 mi away
Near BFI
- SEA · Seattle Tacoma International Airport6 mi away
- RNT · Renton Municipal Airport5 mi away
- PWT · Bremerton National Airport22 mi away
- TIW · Tacoma Narrows Airport22 mi away
Frequently asked questions
How far is SYD from BFI?
The flight distance from Sydney (SYD) to Seattle (BFI) is 7,753 miles (12,477 km, 6,737 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from SYD to BFI?
A nonstop flight takes about 15h 40m gate to gate. Actual time varies with winds, routing and season — eastbound transatlantic flights, for example, are usually faster than the return.
What is the time difference between Sydney and Seattle?
Seattle is 17 hours behind Sydney.
What is the cheapest way to fly from SYD to BFI?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on SYD–BFI that never appear on search engines, with no booking fees.