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SLM to BFI: distance & flight time
Salamanca (Salamanca Airport) → Seattle (Boeing Field King County International Airport)
5,204 mi
8,374 km · 4,522 nm
10h 40m
estimated nonstop flight time
-9h
time difference · heading northwest
See live SLM→BFI fares Phone-only fares on this route — call free
Flight time details
5,204 miles nonstop takes roughly 10h 40m gate to gate, flying northwest. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 9-hour time set-back when reading arrival times on your ticket.
The two airports
- SLM — Salamanca Airport · Salamanca, Spain
- 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 SLM
- VLL · Valladolid Airport62 mi away
- MAD · Adolfo Suárez Madrid–Barajas Airport107 mi away
- BGC · Bragança Airport88 mi away
- ECV · Cuatro Vientos Airport99 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 SLM from BFI?
The flight distance from Salamanca (SLM) to Seattle (BFI) is 5,204 miles (8,374 km, 4,522 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from SLM to BFI?
A nonstop flight takes about 10h 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 Salamanca and Seattle?
Seattle is 9 hours behind Salamanca.
What is the cheapest way to fly from SLM to BFI?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on SLM–BFI that never appear on search engines, with no booking fees.