Cheapest return flights from Chicago to Keflavik in May from 634€

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

Return flights

12 May - 19 May KLM
11 May - 18 May KLM
16 May - 23 May KLM
19 May - 26 May KLM
21 May - 26 May Delta
21 May - 25 May Delta
15 May - 22 May Delta
20 May - 29 May WestJet
27 May - 03 Jun WestJet
19 May - 23 May Southwest Airlines
22 May - 29 May Southwest Airlines
23 May - 13 Jun Southwest Airlines
28 May - 04 Jun Southwest Airlines
29 May - 05 Jun Southwest Airlines

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

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