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YST to BFI: distance & flight time
St. Theresa Point (St. Theresa Point Airport) → Seattle (Boeing Field King County International Airport)
1,269 mi
2,042 km · 1,102 nm
3h 13m
estimated nonstop flight time
-2h
time difference · heading west
See live YST→BFI fares Phone-only fares on this route — call free
Flight time details
1,269 miles nonstop takes roughly 3h 13m gate to gate, flying west. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 2-hour time set-back when reading arrival times on your ticket.
The two airports
- YST — St. Theresa Point Airport · St. Theresa Point, Canada
- 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 YST
- YIV · Island Lake Airport8 mi away
- YGO · Gods Lake Narrows Airport51 mi away
- YRS · Red Sucker Lake Airport57 mi away
- ZGI · Gods River Airport75 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 YST from BFI?
The flight distance from St. Theresa Point (YST) to Seattle (BFI) is 1,269 miles (2,042 km, 1,102 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from YST to BFI?
A nonstop flight takes about 3h 13m 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 St. Theresa Point and Seattle?
Seattle is 2 hours behind St. Theresa Point.
What is the cheapest way to fly from YST to BFI?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on YST–BFI that never appear on search engines, with no booking fees.