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

Return flights

16 Jun - 24 Jun	Flair Airlines
10 Jun - 17 Jun	jetBlue
29 Jun - 08 Jul	Alaska Airlines
28 Jun - 08 Jul	Sun Country Airlines
07 Jun - 11 Jun	Alaska Airlines
18 Jun - 30 Jun	Air Canada
19 Jun - 30 Jun	Air Canada
06 Jun - 11 Jun	jetBlue
05 Jun - 12 Jun	Flair Airlines
29 Jun - 13 Jul	WestJet
27 Jun - 06 Jul	Flair Airlines
16 Jun - 20 Jun	Flair Airlines
25 Jun - 02 Jul	United
23 Jun - 30 Jun	United
21 Jun - 28 Jun	United
30 Jun - 14 Jul	Alaska Airlines
27 Jun - 04 Jul	United
28 Jun - 13 Jul	Icelandair
28 Jun - 12 Jul	Icelandair
29 Jun - 06 Jul	United

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

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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Cheapest return flights from San Francisco to Keflavik in June from $635

Return flights