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UGN to BFI: distance & flight time
Chicago (Waukegan National Airport) → Seattle (Boeing Field King County International Airport)
1,705 mi
2,744 km · 1,481 nm
3h 49m
estimated nonstop flight time
-2h
time difference · heading northwest
See live UGN→BFI fares Phone-only fares on this route — call free
Flight time details
1,705 miles nonstop takes roughly 3h 49m gate to gate, flying northwest. 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
- UGN — Waukegan National Airport · Chicago, 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 UGN
- ORD · Chicago O'Hare International Airport31 mi away
- ENW · Kenosha Regional Airport12 mi away
- PWK · Chicago Executive Airport21 mi away
- RAC · John H Batten Airport24 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 UGN from BFI?
The flight distance from Chicago (UGN) to Seattle (BFI) is 1,705 miles (2,744 km, 1,481 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from UGN to BFI?
A nonstop flight takes about 3h 49m 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 Chicago and Seattle?
Seattle is 2 hours behind Chicago.
What is the cheapest way to fly from UGN to BFI?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on UGN–BFI that never appear on search engines, with no booking fees.