Cheapest return flights from Chicago to Lisbon in May from $651

Best time to book flights for Chicago (MDW) to Lisbon (LIS) flights at AirHint

AirHint found the following cheapest return flights from Chicago (MDW) to Lisbon (LIS) in May 2025 (see full year).

Return flights

10 May - 23 May Delta
05 May - 11 May Delta
04 May - 14 May Delta
04 May - 12 May Delta
26 May - 02 Jun Porter Airlines (Canada) Ltd
21 May - 05 Jun Porter Airlines (Canada) Ltd
19 May - 28 May Frontier Airlines
08 May - 12 Jun Frontier Airlines
27 May - 04 Jun Porter Airlines (Canada) Ltd
25 May - 01 Jun Porter Airlines (Canada) Ltd
27 May - 01 Jun Porter Airlines (Canada) Ltd
28 May - 01 Jun Porter Airlines (Canada) Ltd
04 May - 18 May Delta
23 May - 01 Jun Porter Airlines (Canada) Ltd
23 May - 28 May Porter Airlines (Canada) Ltd
16 May - 21 May Delta
16 May - 23 May Delta
17 May - 24 May Delta
21 May - 02 Jun Delta

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

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The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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