Cheapest return MDW–KEF flights, May

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

Return flights

09 May - 28 May Southwest Airlines
19 May - 28 May Porter Airlines (Canada) Ltd
17 May - 28 May Porter Airlines (Canada) Ltd
04 May - 28 May Frontier Airlines
13 May - 28 May Southwest Airlines
16 May - 28 May Southwest Airlines
29 May - 06 Jun Southwest Airlines
29 May - 14 Jun Porter Airlines (Canada) Ltd
20 May - 28 May Porter Airlines (Canada) Ltd
25 May - 29 May Southwest Airlines
03 May - 10 May Frontier Airlines
12 May - 28 May Frontier Airlines
31 May - 14 Jun Porter Airlines (Canada) Ltd

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

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The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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