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WBU to BFI: distance & flight time
Boulder (Boulder Municipal Airport) → Seattle (Boeing Field King County International Airport)
993 mi
1,599 km · 863 nm
2h 38m
estimated nonstop flight time
-1h
time difference · heading northwest
See live WBU→BFI fares Phone-only fares on this route — call free
Flight time details
993 miles nonstop takes roughly 2h 38m gate to gate, flying northwest. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 1-hour time set-back when reading arrival times on your ticket.
The two airports
- WBU — Boulder Municipal Airport · Boulder, United States
- 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 WBU
- DEN · Denver International Airport32 mi away
- BJC · Rocky Mountain Metropolitan Airport11 mi away
- FNL · Northern Colorado Regional Airport31 mi away
- BFK · Buckley Air Force Base34 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 WBU from BFI?
The flight distance from Boulder (WBU) to Seattle (BFI) is 993 miles (1,599 km, 863 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from WBU to BFI?
A nonstop flight takes about 2h 38m 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 Boulder and Seattle?
Seattle is 1 hour behind Boulder.
What is the cheapest way to fly from WBU to BFI?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on WBU–BFI that never appear on search engines, with no booking fees.