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IAD to ROI: distance & flight time
Washington (Washington Dulles International Airport) → Roi Et (Roi Et Airport)
8,632 mi
13,891 km · 7,501 nm
17h 23m
estimated nonstop flight time
+11h
time difference · heading north
See live IAD→ROI fares Phone-only fares on this route — call free
Flight time details
8,632 miles nonstop takes roughly 17h 23m 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
- IAD — Washington Dulles International Airport · Washington, United States
- ROI — Roi Et Airport · Roi Et, Thailand
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 ROI
- KKC · Khon Kaen Airport70 mi away
- BFV · Buri Ram Airport70 mi away
- ZVK · Savannakhet Airport72 mi away
- SNO · Sakon Nakhon Airport78 mi away
Frequently asked questions
How far is IAD from ROI?
The flight distance from Washington (IAD) to Roi Et (ROI) is 8,632 miles (13,891 km, 7,501 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from IAD to ROI?
A nonstop flight takes about 17h 23m 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 Washington and Roi Et?
Roi Et is 11 hours ahead of Washington.
What is the cheapest way to fly from IAD to ROI?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on IAD–ROI that never appear on search engines, with no booking fees.