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

Return flights

18 Aug - 25 Aug	KLM
19 Aug - 26 Aug	Air France
20 Aug - 27 Aug	Air France
21 Aug - 28 Aug	Air France
22 Aug - 29 Aug	Air France
23 Aug - 30 Aug	Air France
30 Aug - 12 Sep	Air France
02 Aug - 09 Aug	Delta
04 Aug - 13 Aug	Porter Airlines (Canada) Ltd
05 Aug - 12 Aug	Air France
08 Aug - 15 Aug	WestJet

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

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 August from $716

Return flights