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

Return flights

02 Apr - 10 Apr	Frontier Airlines
08 Apr - 15 Apr	Virgin Atlantic
03 Apr - 12 Apr	Delta
01 Apr - 08 Apr	Virgin Atlantic
08 Apr - 13 Apr	Delta
09 Apr - 21 Apr	Delta
10 Apr - 17 Apr	Delta
11 Apr - 19 Apr	Delta
19 Apr - 26 Apr	Delta
25 Apr - 10 May	Delta
16 Apr - 20 Apr	WestJet
24 Apr - 01 May	Delta
30 Apr - 04 May	Porter Airlines (Canada) Ltd
30 Apr - 07 May	Porter Airlines (Canada) Ltd
29 Apr - 04 May	Porter Airlines (Canada) Ltd

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

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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Cheapest return flights from Chicago to Lisbon in April from $788

Return flights