Need help booking?
Unpublished phone-only deals available
REP to IAD: distance & flight time
Siem-reap (Siem Reap International Airport) → Washington (Washington Dulles International Airport)
8,818 mi
14,192 km · 7,663 nm
17h 45m
estimated nonstop flight time
-11h
time difference · heading north
See live REP→IAD fares Phone-only fares on this route — call free
Flight time details
8,818 miles nonstop takes roughly 17h 45m gate to gate, flying north. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 11-hour time set-back when reading arrival times on your ticket.
The two airports
- REP — Siem Reap International Airport · Siem-reap, Cambodia
- IAD — Washington Dulles International Airport · Washington, 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 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 REP from IAD?
The flight distance from Siem-reap (REP) to Washington (IAD) is 8,818 miles (14,192 km, 7,663 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from REP to IAD?
A nonstop flight takes about 17h 45m 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 Siem-reap and Washington?
Washington is 11 hours behind Siem-reap.
What is the cheapest way to fly from REP to IAD?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on REP–IAD that never appear on search engines, with no booking fees.