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

Return flights

12 Mar - 19 Mar	Spirit Airlines
25 Mar - 01 Apr	Spirit Airlines
03 Mar - 10 Mar	Spirit Airlines
09 Mar - 16 Mar	Spirit Airlines
05 Mar - 12 Mar	Spirit Airlines
11 Mar - 18 Mar	Spirit Airlines
18 Mar - 25 Mar	Spirit Airlines
15 Mar - 22 Mar	Spirit Airlines
21 Mar - 28 Mar	Spirit Airlines
23 Mar - 30 Mar	Lufthansa
06 Mar - 15 Mar	Spirit Airlines
27 Mar - 03 Apr	Spirit Airlines
28 Mar - 04 Apr	Spirit Airlines
30 Mar - 03 Apr	Southwest Airlines
29 Mar - 05 Apr	Lufthansa
26 Mar - 02 Apr	Spirit Airlines

Also check the deals for one-way flights from Detroit 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 Detroit to Keflavik in March from $549

Return flights