Cheapest return flights from Chicago to Lisbon in May from 710€

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

Return flights

31 May - 08 Jun Porter Airlines (Canada) Ltd
26 May - 09 Jun Porter Airlines (Canada) Ltd
27 May - 10 Jun Porter Airlines (Canada) Ltd
03 May - 10 May Frontier Airlines
25 May - 09 Jun Porter Airlines (Canada) Ltd
21 May - 27 May Porter Airlines (Canada) Ltd
11 May - 16 May Porter Airlines (Canada) Ltd
29 May - 06 Jun Porter Airlines (Canada) Ltd
02 May - 10 May Frontier Airlines
24 May - 24 Jun Porter Airlines (Canada) Ltd
06 May - 10 May Delta
25 May - 30 May Porter Airlines (Canada) Ltd
02 May - 09 May Frontier Airlines
30 May - 05 Jun Porter Airlines (Canada) Ltd
30 May - 06 Jun Porter Airlines (Canada) Ltd
29 May - 04 Jun Porter Airlines (Canada) Ltd
18 May - 22 May Porter Airlines (Canada) Ltd
06 May - 20 May KLM
24 May - 31 May Porter Airlines (Canada) Ltd
30 May - 07 Jun Porter Airlines (Canada) Ltd

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

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