Cheapest return flights from Chicago to Lisbon in May from 582€

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

Return flights

04 May - 11 May Air Transat
02 May - 06 May Porter Airlines (Canada) Ltd
14 May - 21 May Porter Airlines (Canada) Ltd
05 May - 12 May Porter Airlines (Canada) Ltd
06 May - 13 May Porter Airlines (Canada) Ltd
07 May - 14 May Porter Airlines (Canada) Ltd
01 May - 08 May Porter Airlines (Canada) Ltd
21 May - 28 May Air Transat
03 May - 10 May Porter Airlines (Canada) Ltd
02 May - 08 May Porter Airlines (Canada) Ltd
29 May - 12 Jun Porter Airlines (Canada) Ltd
20 May - 13 Jun Porter Airlines (Canada) Ltd
22 May - 13 Jun Air Transat
25 May - 01 Jun Porter Airlines (Canada) Ltd
28 May - 11 Jun Porter Airlines (Canada) Ltd

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

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