Need help booking?
Unpublished phone-only deals available
BFI to DUC: distance & flight time
Seattle (Boeing Field King County International Airport) → Duncan (Halliburton Field)
1,547 mi
2,489 km · 1,344 nm
3h 30m
estimated nonstop flight time
+2h
time difference · heading southeast
See live BFI→DUC fares Phone-only fares on this route — call free
Flight time details
1,547 miles nonstop takes roughly 3h 30m gate to gate, flying southeast. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 2-hour time gain when reading arrival times on your ticket.
The two airports
- BFI — Boeing Field King County International Airport · Seattle, United States
- DUC — Halliburton Field · Duncan, 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 DUC
Frequently asked questions
How far is BFI from DUC?
The flight distance from Seattle (BFI) to Duncan (DUC) is 1,547 miles (2,489 km, 1,344 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from BFI to DUC?
A nonstop flight takes about 3h 30m 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 Duncan?
Duncan is 2 hours ahead of Seattle.
What is the cheapest way to fly from BFI to DUC?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on BFI–DUC that never appear on search engines, with no booking fees.