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IAD to PSM: distance & flight time
Washington (Washington Dulles International Airport) → Portsmouth (Portsmouth International at Pease Airport)
448 mi
721 km · 390 nm
1h 26m
estimated nonstop flight time
Same time
time difference · heading northeast
See live IAD→PSM fares Phone-only fares on this route — call free
Flight time details
448 miles nonstop takes roughly 1h 26m gate to gate, flying northeast. Add 45–90 minutes per connection if there's no nonstop service. Both airports share the same local time, so schedules read exactly as flown.
The two airports
- IAD — Washington Dulles International Airport · Washington, United States
- PSM — Portsmouth International at Pease Airport · Portsmouth, 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 IAD
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
Frequently asked questions
How far is IAD from PSM?
The flight distance from Washington (IAD) to Portsmouth (PSM) is 448 miles (721 km, 390 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from IAD to PSM?
A nonstop flight takes about 1h 26m 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 cheapest way to fly from IAD to PSM?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on IAD–PSM that never appear on search engines, with no booking fees.