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BFI to GAI: distance & flight time
Seattle (Boeing Field King County International Airport) → Gaithersburg (Montgomery County Airpark)
2,305 mi
3,710 km · 2,003 nm
4h 59m
estimated nonstop flight time
+3h
time difference · heading east
See live BFI→GAI fares Phone-only fares on this route — call free
Flight time details
2,305 miles nonstop takes roughly 4h 59m gate to gate, flying east. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 3-hour time gain when reading arrival times on your ticket.
The two airports
- BFI — Boeing Field King County International Airport · Seattle, United States
- GAI — Montgomery County Airpark · Gaithersburg, 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 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
Near GAI
Frequently asked questions
How far is BFI from GAI?
The flight distance from Seattle (BFI) to Gaithersburg (GAI) is 2,305 miles (3,710 km, 2,003 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from BFI to GAI?
A nonstop flight takes about 4h 59m 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 Seattle and Gaithersburg?
Gaithersburg is 3 hours ahead of Seattle.
What is the cheapest way to fly from BFI to GAI?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on BFI–GAI that never appear on search engines, with no booking fees.