Cheapest return flights from San Francisco to Keflavik in September from 414€

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

Return flights

30 Sep - 07 Oct Flair Airlines
23 Sep - 01 Oct Hawaiian Airlines
30 Sep - 08 Oct Hawaiian Airlines
04 Sep - 11 Sep Hawaiian Airlines
07 Sep - 15 Sep Frontier Airlines
15 Sep - 23 Sep Hawaiian Airlines
16 Sep - 24 Sep Hawaiian Airlines
02 Sep - 10 Sep Alaska Airlines
06 Sep - 13 Sep Hawaiian Airlines
09 Sep - 17 Sep Hawaiian Airlines
10 Sep - 17 Sep Alaska Airlines
27 Sep - 04 Oct Flair Airlines
24 Sep - 02 Oct WestJet
28 Sep - 06 Oct Sun Country Airlines
06 Sep - 14 Sep Sun Country Airlines
26 Sep - 04 Oct WestJet
03 Sep - 11 Sep Frontier Airlines
29 Sep - 07 Oct Flair Airlines
27 Sep - 05 Oct jetBlue
25 Sep - 03 Oct Frontier Airlines

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

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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.

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