Cheapest return flights from Chicago to Keflavik in March from $819

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

Return flights

23 Mar - 30 Mar Frontier Airlines
06 Mar - 13 Mar Frontier Airlines
25 Mar - 05 Apr Frontier Airlines
22 Mar - 29 Mar Frontier Airlines
31 Mar - 07 Apr Southwest Airlines
08 Mar - 15 Mar Frontier Airlines
10 Mar - 17 Mar Southwest Airlines
03 Mar - 10 Mar Southwest Airlines
05 Mar - 12 Mar Air France
29 Mar - 07 Apr Southwest Airlines
09 Mar - 16 Mar KLM
25 Mar - 01 Apr Frontier Airlines
29 Mar - 05 Apr Frontier Airlines
21 Mar - 28 Mar Frontier Airlines
02 Mar - 09 Mar Southwest Airlines
30 Mar - 06 Apr Southwest Airlines
29 Mar - 06 Apr Frontier Airlines
25 Mar - 04 Apr Porter Airlines (Canada) Ltd
28 Mar - 01 Apr Porter Airlines (Canada) Ltd
28 Mar - 04 Apr Porter Airlines (Canada) Ltd

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

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