Cheapest return flights from Chicago to Keflavik in March from $742

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

Return flights

30 Mar - 06 Apr Virgin Atlantic
01 Mar - 08 Mar Frontier Airlines
11 Mar - 18 Mar Frontier Airlines
03 Mar - 10 Mar Southwest Airlines
09 Mar - 16 Mar Southwest Airlines
10 Mar - 17 Mar Southwest Airlines
17 Mar - 24 Mar Southwest Airlines
16 Mar - 23 Mar Southwest Airlines
08 Mar - 15 Mar Southwest Airlines
25 Mar - 01 Apr Southwest Airlines
05 Mar - 12 Mar Southwest Airlines
02 Mar - 07 Mar Southwest Airlines
31 Mar - 07 Apr Frontier Airlines
25 Mar - 04 Apr Porter Airlines (Canada) Ltd
25 Mar - 03 Apr Porter Airlines (Canada) Ltd
28 Mar - 05 Apr Porter Airlines (Canada) Ltd
25 Mar - 05 Apr Porter Airlines (Canada) Ltd

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

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