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SFO to SIR: distance & flight time
San Francisco (San Francisco International Airport) → Sion (Sion Airport)
5,859 mi
9,429 km · 5,091 nm
11h 57m
estimated nonstop flight time
+9h
time difference · heading northeast
See live SFO→SIR fares Phone-only fares on this route — call free
Flight time details
5,859 miles nonstop takes roughly 11h 57m gate to gate, flying northeast. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 9-hour time gain when reading arrival times on your ticket.
The two airports
- SFO — San Francisco International Airport · San Francisco, 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 SFO
- SQL · San Carlos Airport10 mi away
- HAF · Half Moon Bay Airport10 mi away
- OAK · Metropolitan Oakland International Airport11 mi away
- NGZ · Alameda Naval Air Station12 mi away
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 SFO from SIR?
The flight distance from San Francisco (SFO) to Sion (SIR) is 5,859 miles (9,429 km, 5,091 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from SFO to SIR?
A nonstop flight takes about 11h 57m 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 San Francisco and Sion?
Sion is 9 hours ahead of San Francisco.
What is the cheapest way to fly from SFO to SIR?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on SFO–SIR that never appear on search engines, with no booking fees.