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KEF to SFO: distance & flight time
Keflavik (Keflavik International Airport) → San Francisco (San Francisco International Airport)
4,193 mi
6,748 km · 3,644 nm
8h 41m
estimated nonstop flight time
-7h
time difference · heading northwest
See live KEF→SFO fares Phone-only fares on this route — call free
Flight time details
4,193 miles nonstop takes roughly 8h 41m gate to gate, flying northwest. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 7-hour time set-back when reading arrival times on your ticket.
The two airports
- KEF — Keflavik International Airport · Keflavik, Iceland
- SFO — San Francisco International Airport · San Francisco, 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 KEF
- RKV · Reykjavik Airport22 mi away
- GUU · Grundarfjörður Airport72 mi away
- VEY · Vestmannaeyjar Airport81 mi away
- PFJ · Patreksfjörður Airport116 mi away
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
Frequently asked questions
How far is KEF from SFO?
The flight distance from Keflavik (KEF) to San Francisco (SFO) is 4,193 miles (6,748 km, 3,644 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from KEF to SFO?
A nonstop flight takes about 8h 41m 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 Keflavik and San Francisco?
San Francisco is 7 hours behind Keflavik.
What is the cheapest way to fly from KEF to SFO?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on KEF–SFO that never appear on search engines, with no booking fees.