Cheapest return flights from Chicago to Lisbon in May from $565

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

Return flights

06 May - 13 May Delta
11 May - 19 May Delta
21 May - 27 May Porter Airlines (Canada) Ltd
09 May - 17 May Frontier Airlines
21 May - 25 May Porter Airlines (Canada) Ltd
02 May - 15 May Delta
08 May - 10 May Frontier Airlines
08 May - 17 May Frontier Airlines
29 May - 02 Jun Porter Airlines (Canada) Ltd
02 May - 17 May Porter Airlines (Canada) Ltd
22 May - 31 May Porter Airlines (Canada) Ltd
31 May - 04 Jun Porter Airlines (Canada) Ltd
30 May - 28 Jun Frontier Airlines

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

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