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SOF to BFI: distance & flight time
Sofia (Sofia Airport) → Seattle (Boeing Field King County International Airport)
5,861 mi
9,432 km · 5,093 nm
11h 58m
estimated nonstop flight time
-10h
time difference · heading north
See live SOF→BFI fares Phone-only fares on this route — call free
Flight time details
5,861 miles nonstop takes roughly 11h 58m gate to gate, flying north. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 10-hour time set-back when reading arrival times on your ticket.
The two airports
- SOF — Sofia Airport · Sofia, Bulgaria
- 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 SOF
- PDV · Plovdiv International Airport85 mi away
- INI · Nis Airport90 mi away
- SKP · Skopje Alexander the Great Airport105 mi away
- CRA · Craiova Airport115 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 SOF from BFI?
The flight distance from Sofia (SOF) to Seattle (BFI) is 5,861 miles (9,432 km, 5,093 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from SOF to BFI?
A nonstop flight takes about 11h 58m 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 Sofia and Seattle?
Seattle is 10 hours behind Sofia.
What is the cheapest way to fly from SOF to BFI?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on SOF–BFI that never appear on search engines, with no booking fees.