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IAD to SIR: distance & flight time
Washington (Washington Dulles International Airport) → Sion (Sion Airport)
4,133 mi
6,651 km · 3,591 nm
8h 34m
estimated nonstop flight time
+6h
time difference · heading northeast
See live IAD→SIR fares Phone-only fares on this route — call free
Flight time details
4,133 miles nonstop takes roughly 8h 34m gate to gate, flying northeast. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 6-hour time gain when reading arrival times on your ticket.
The two airports
- IAD — Washington Dulles International Airport · Washington, United States
- SIR — Sion Airport · Sion, Switzerland
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 SIR
- AOT · Aosta Airport33 mi away
- QLS · Lausanne-Blécherette Airport41 mi away
- ZIN · Interlaken Air Base41 mi away
- MVV · Megève Airport43 mi away
Frequently asked questions
How far is IAD from SIR?
The flight distance from Washington (IAD) to Sion (SIR) is 4,133 miles (6,651 km, 3,591 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from IAD to SIR?
A nonstop flight takes about 8h 34m 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 Sion?
Sion is 6 hours ahead of Washington.
What is the cheapest way to fly from IAD to SIR?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on IAD–SIR that never appear on search engines, with no booking fees.