Cheapest return flights from Chicago to Lisbon in May from $890

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

Return flights

24 May - 05 Jun Delta
23 May - 30 May Porter Airlines (Canada) Ltd
11 May - 18 May Porter Airlines (Canada) Ltd
17 May - 27 May Porter Airlines (Canada) Ltd
29 May - 30 Jun Porter Airlines (Canada) Ltd
12 May - 17 May Porter Airlines (Canada) Ltd
15 May - 25 May Porter Airlines (Canada) Ltd
24 May - 31 May Delta
09 May - 16 May Delta
11 May - 23 May Delta
04 May - 12 Jun Delta
10 May - 17 May Delta
03 May - 10 May Delta

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

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