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

Return flights

16 Apr - 23 Apr	KLM
18 Apr - 29 Apr	Delta
21 Apr - 29 Apr	Delta
18 Apr - 26 Apr	Delta
12 Apr - 21 May	Delta
22 Apr - 29 Apr	WestJet
14 Apr - 22 Apr	WestJet
23 Apr - 30 Apr	WestJet
24 Apr - 01 May	WestJet
07 Apr - 14 Apr	Southwest Airlines
06 Apr - 14 Apr	Delta
06 Apr - 13 Apr	Delta

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

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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Cheapest return flights from Chicago to Keflavik in April from 607€

Return flights