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PSM to BFI: distance & flight time
Portsmouth (Portsmouth International at Pease Airport) → Seattle (Boeing Field King County International Airport)
2,474 mi
3,982 km · 2,150 nm
5h 19m
estimated nonstop flight time
-3h
time difference · heading northwest
See live PSM→BFI fares Phone-only fares on this route — call free
Flight time details
2,474 miles nonstop takes roughly 5h 19m gate to gate, flying northwest. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 3-hour time set-back when reading arrival times on your ticket.
The two airports
- PSM — Portsmouth International at Pease Airport · Portsmouth, 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 PSM
- BOS · General Edward Lawrence Logan International Airport50 mi away
- LWM · Lawrence Municipal Airport29 mi away
- MHT · Manchester-Boston Regional Airport33 mi away
- BVY · Beverly Municipal Airport34 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 PSM from BFI?
The flight distance from Portsmouth (PSM) to Seattle (BFI) is 2,474 miles (3,982 km, 2,150 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from PSM to BFI?
A nonstop flight takes about 5h 19m gate to gate. Actual time varies with winds, routing and season — eastbound transatlantic flights, for example, are usually faster than the return.
Are there nonstop flights from PSM to BFI?
Nonstop service on PSM–BFI depends on the season and the day of week. Run the fare search on this page with the nonstop filter applied to see current direct options; when there is no nonstop, a single connection through a carrier hub adds roughly 2–4 hours to the 5h 19m nonstop estimate.
What is the time difference between Portsmouth and Seattle?
Seattle is 3 hours behind Portsmouth.
What is the cheapest way to fly from PSM to BFI?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on PSM–BFI that never appear on search engines, with no booking fees.
Why are some PSM to BFI fares phone-only?
Consolidator contracts let us sell certain PSM–BFI tickets below the price airlines permit us to publish online, so those fares can only be quoted over the phone. Call the travel desk and an agent will check phone-only inventory for your dates.