AirHint found the following cheapest return flights from San Jose (SJC) to Keflavik (KEF) in March 2026 (see full year).

Return flights

24 Mar - 01 Apr	Alaska Airlines
19 Mar - 27 Mar	Alaska Airlines
26 Mar - 03 Apr	Alaska Airlines
24 Mar - 31 Mar	Alaska Airlines
23 Mar - 31 Mar	Alaska Airlines
25 Mar - 02 Apr	Alaska Airlines
30 Mar - 07 Apr	Alaska Airlines
31 Mar - 08 Apr	Alaska Airlines
25 Mar - 01 Apr	Alaska Airlines
31 Mar - 07 Apr	Alaska Airlines
30 Mar - 06 Apr	Alaska Airlines
21 Mar - 29 Mar	Alaska Airlines
27 Mar - 03 Apr	Icelandair
28 Mar - 05 Apr	Alaska Airlines
20 Mar - 28 Mar	Alaska Airlines
22 Mar - 30 Mar	Alaska Airlines

Also check the deals for one-way flights from San Jose to Keflavik in March.

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 Jose to Keflavik in March from 818€

Return flights