Cheapest return flights from Chicago to Keflavik in March from 603€

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 KLM
01 Mar - 08 Mar Frontier Airlines
11 Mar - 18 Mar Frontier Airlines
04 Mar - 11 Mar WestJet
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
22 Mar - 29 Mar Frontier Airlines
31 Mar - 07 Apr Frontier Airlines
25 Mar - 03 Apr Frontier Airlines
25 Mar - 04 Apr Frontier Airlines
25 Mar - 05 Apr Frontier Airlines
28 Mar - 05 Apr Southwest Airlines

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

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