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PSM to CPR: distance & flight time
Portsmouth (Portsmouth International at Pease Airport) → Casper (Casper-Natrona County International Airport)
1,787 mi
2,877 km · 1,553 nm
3h 58m
estimated nonstop flight time
-2h
time difference · heading west
See live PSM→CPR fares Phone-only fares on this route — call free
Flight time details
1,787 miles nonstop takes roughly 3h 58m gate to gate, flying west. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 2-hour time set-back when reading arrival times on your ticket.
The two airports
- PSM — Portsmouth International at Pease Airport · Portsmouth, United States
- CPR — Casper-Natrona County International Airport · Casper, 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 CPR
- RWL · Rawlins Municipal Airport/Harvey Field85 mi away
- RIW · Riverton Regional Airport101 mi away
- SAA · Shively Field103 mi away
- WRL · Worland Municipal Airport104 mi away
Frequently asked questions
How far is PSM from CPR?
The flight distance from Portsmouth (PSM) to Casper (CPR) is 1,787 miles (2,877 km, 1,553 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from PSM to CPR?
A nonstop flight takes about 3h 58m 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 Portsmouth and Casper?
Casper is 2 hours behind Portsmouth.
What is the cheapest way to fly from PSM to CPR?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on PSM–CPR that never appear on search engines, with no booking fees.