Need help booking?
Unpublished phone-only deals available
ZBY to BFI: distance & flight time
Sainyabuli (Sayaboury Airport) → Seattle (Boeing Field King County International Airport)
7,078 mi
11,390 km · 6,150 nm
14h 21m
estimated nonstop flight time
—
time difference · heading northeast
See live ZBY→BFI fares Phone-only fares on this route — call free
Flight time details
7,078 miles nonstop takes roughly 14h 21m gate to gate, flying northeast. Add 45–90 minutes per connection if there's no nonstop service. Both airports share the same local time, so schedules read exactly as flown.
The two airports
- ZBY — Sayaboury Airport · Sainyabuli, Laos
- 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 ZBY
- LPQ · Luang Phabang International Airport54 mi away
- NNT · Nan Airport68 mi away
- XKH · Xieng Khouang Airport96 mi away
- ODY · Oudomsay Airport101 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 ZBY from BFI?
The flight distance from Sainyabuli (ZBY) to Seattle (BFI) is 7,078 miles (11,390 km, 6,150 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from ZBY to BFI?
A nonstop flight takes about 14h 21m 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 cheapest way to fly from ZBY to BFI?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on ZBY–BFI that never appear on search engines, with no booking fees.