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PSM to REP: distance & flight time
Portsmouth (Portsmouth International at Pease Airport) → Siem-reap (Siem Reap International Airport)
8,519 mi
13,710 km · 7,403 nm
17h 10m
estimated nonstop flight time
+11h
time difference · heading north
See live PSM→REP fares Phone-only fares on this route — call free
Flight time details
8,519 miles nonstop takes roughly 17h 10m gate to gate, flying north. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 11-hour time gain when reading arrival times on your ticket.
The two airports
- PSM — Portsmouth International at Pease Airport · Portsmouth, United States
- REP — Siem Reap International Airport · Siem-reap, Cambodia
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 REP
- BBM · Battambang Airport45 mi away
- KZC · Kampong Chhnang Airport95 mi away
- PXR · Surin Airport103 mi away
- TDX · Trat Airport128 mi away
Frequently asked questions
How far is PSM from REP?
The flight distance from Portsmouth (PSM) to Siem-reap (REP) is 8,519 miles (13,710 km, 7,403 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from PSM to REP?
A nonstop flight takes about 17h 10m 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 REP?
Nonstop service on PSM–REP 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 17h 10m nonstop estimate.
What is the time difference between Portsmouth and Siem-reap?
Siem-reap is 11 hours ahead of Portsmouth.
What is the cheapest way to fly from PSM to REP?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on PSM–REP that never appear on search engines, with no booking fees.
Why are some PSM to REP fares phone-only?
Consolidator contracts let us sell certain PSM–REP 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.