Need help booking?
Unpublished phone-only deals available
BTM to PSM: distance & flight time
Butte (Bert Mooney Airport) → Portsmouth (Portsmouth International at Pease Airport)
2,039 mi
3,282 km · 1,772 nm
4h 28m
estimated nonstop flight time
+2h
time difference · heading east
See live BTM→PSM fares Phone-only fares on this route — call free
Flight time details
2,039 miles nonstop takes roughly 4h 28m gate to gate, flying east. 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
- BTM — Bert Mooney Airport · Butte, 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 BTM
- HLN · Helena Regional Airport51 mi away
- BZN · Gallatin Field66 mi away
- SMN · Lemhi County Airport88 mi away
- LVM · Mission Field100 mi away
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 BTM from PSM?
The flight distance from Butte (BTM) to Portsmouth (PSM) is 2,039 miles (3,282 km, 1,772 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from BTM to PSM?
A nonstop flight takes about 4h 28m 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 BTM to PSM?
Nonstop service on BTM–PSM 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 4h 28m nonstop estimate.
What is the time difference between Butte and Portsmouth?
Portsmouth is 2 hours ahead of Butte.
What is the cheapest way to fly from BTM to PSM?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on BTM–PSM that never appear on search engines, with no booking fees.
Why are some BTM to PSM fares phone-only?
Consolidator contracts let us sell certain BTM–PSM 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.