Need help booking?
Unpublished phone-only deals available
OSR to BFI: distance & flight time
Ostrava (Ostrava Leos Janáček Airport) → Seattle (Boeing Field King County International Airport)
5,316 mi
8,555 km · 4,620 nm
10h 53m
estimated nonstop flight time
-9h
time difference · heading northwest
See live OSR→BFI fares Phone-only fares on this route — call free
Flight time details
5,316 miles nonstop takes roughly 10h 53m 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
- OSR — Ostrava Leos Janáček Airport · Ostrava, Czech Republic
- 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 OSR
- PRV · Přerov Air Base37 mi away
- ILZ · Žilina Airport39 mi away
- UHE · Kunovice Airport55 mi away
- KTW · Katowice International Airport69 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 OSR from BFI?
The flight distance from Ostrava (OSR) to Seattle (BFI) is 5,316 miles (8,555 km, 4,620 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from OSR to BFI?
A nonstop flight takes about 10h 53m 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 Ostrava and Seattle?
Seattle is 9 hours behind Ostrava.
What is the cheapest way to fly from OSR to BFI?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on OSR–BFI that never appear on search engines, with no booking fees.