Cheapest return flights from San Francisco to Keflavik in September from 464€

AirHint found the following cheapest return flights from San Francisco (SFO) to Keflavik (KEF) in September 2025 (see full year).

Return flights

03 Sep - 11 Sep Hawaiian Airlines
24 Sep - 02 Oct WestJet
26 Sep - 04 Oct WestJet
14 Sep - 22 Sep Flair Airlines
02 Sep - 10 Sep Hawaiian Airlines
10 Sep - 18 Sep jetBlue
08 Sep - 16 Sep Hawaiian Airlines
16 Sep - 24 Sep Hawaiian Airlines
19 Sep - 22 Sep WestJet
15 Sep - 23 Sep Hawaiian Airlines
22 Sep - 30 Sep Flair Airlines
23 Sep - 01 Oct Flair Airlines
13 Sep - 21 Sep Hawaiian Airlines
27 Sep - 05 Oct Hawaiian Airlines
30 Sep - 08 Oct Frontier Airlines
25 Sep - 03 Oct Alaska Airlines
28 Sep - 06 Oct jetBlue
29 Sep - 07 Oct Frontier Airlines

Also check the deals for one-way flights from San Francisco to Keflavik in September.

Skyscanner

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

Book a cheap hotel in Keflavik

Cheap car rent in Keflavik

Feel free to contact us with any feedback or request another flight research.