Cheapest return flights from Chicago to Lisbon in May from $888

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

Return flights

21 May - 27 May Porter Airlines (Canada) Ltd
11 May - 21 May Porter Airlines (Canada) Ltd
04 May - 11 May Porter Airlines (Canada) Ltd
06 May - 10 May WestJet
21 May - 29 May Porter Airlines (Canada) Ltd
21 May - 28 May Porter Airlines (Canada) Ltd
08 May - 15 May Delta
07 May - 10 May Delta
01 May - 10 May Porter Airlines (Canada) Ltd
17 May - 07 Jun Porter Airlines (Canada) Ltd
31 May - 25 Jun Porter Airlines (Canada) Ltd
08 May - 10 May WestJet

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

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