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

Return flights

31 Mar - 08 Apr	British Airways
23 Mar - 31 Mar	SWISS
19 Mar - 27 Mar	British Airways
26 Mar - 02 Apr	SWISS
31 Mar - 07 Apr	Lufthansa
26 Mar - 03 Apr	SWISS
24 Mar - 01 Apr	Hawaiian Airlines
24 Mar - 31 Mar	Lufthansa
30 Mar - 06 Apr	Hawaiian Airlines
29 Mar - 06 Apr	Lufthansa
22 Mar - 30 Mar	British Airways
29 Mar - 05 Apr	Lufthansa
25 Mar - 01 Apr	Hawaiian Airlines
27 Mar - 04 Apr	Hawaiian Airlines
21 Mar - 29 Mar	British Airways
20 Mar - 28 Mar	Hawaiian Airlines

Also check the deals for one-way flights from San Francisco 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 Francisco to Keflavik in March from 523€

Return flights