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

Return flights

22 Jul - 27 Jul	Delta
27 Jul - 04 Aug	Air France
21 Jul - 27 Jul	Delta
10 Jul - 16 Jul	Alaska Airlines
23 Jul - 30 Jul	Alaska Airlines
24 Jul - 01 Aug	Air France
09 Jul - 30 Jul	Alaska Airlines
12 Jul - 19 Jul	Alaska Airlines
18 Jul - 22 Jul	Air France
17 Jul - 24 Jul	Delta
18 Jul - 27 Jul	Delta
24 Jul - 31 Jul	United
30 Jul - 06 Aug	United
28 Jul - 04 Aug	United
26 Jul - 02 Aug	United

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

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 July from 596€

Return flights