Cheapest return flights from Chicago to Keflavik in March from 597€

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

Return flights

16 Mar - 20 Mar Frontier Airlines
30 Mar - 06 Apr WestJet
24 Mar - 31 Mar Southwest Airlines
31 Mar - 07 Apr Southwest Airlines
23 Mar - 31 Mar Frontier Airlines
24 Mar - 29 Mar Southwest Airlines
24 Mar - 29 Apr Frontier Airlines
30 Mar - 05 Apr Frontier Airlines
04 Mar - 09 Mar Southwest Airlines
01 Mar - 09 Mar Southwest Airlines
05 Mar - 09 Mar Frontier Airlines
17 Mar - 24 Mar Southwest Airlines
22 Mar - 31 Mar Southwest Airlines
20 Mar - 31 Mar Frontier Airlines
28 Mar - 02 Apr Frontier Airlines
14 Mar - 29 Apr Delta

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

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