Cheapest return flights from Chicago to Keflavik in May from 641€

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

Return flights

05 May - 12 May Frontier Airlines
07 May - 14 May WestJet
01 May - 08 May WestJet
06 May - 13 May WestJet
13 May - 28 May Southwest Airlines
12 May - 28 May Southwest Airlines
13 May - 01 Jun Southwest Airlines
13 May - 04 Jun Southwest Airlines
10 May - 17 May Southwest Airlines
12 May - 19 May Southwest Airlines
02 May - 09 May KLM
03 May - 10 May KLM
13 May - 05 Jun Southwest Airlines
13 May - 08 Jun Southwest Airlines
10 May - 09 Jun Southwest Airlines
12 May - 09 Jun Southwest Airlines
13 May - 06 Jun Southwest Airlines
13 May - 09 Jun Southwest Airlines
11 May - 09 Jun Southwest Airlines
13 May - 07 Jun Southwest Airlines

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

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