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

Return flights

02 May - 10 May	TAP	direct
01 May - 08 May	Lufthansa
13 May - 16 May	Turkish Airlines
21 May - 24 May	United
01 May - 10 May	Lufthansa
14 May - 17 May	United
15 May - 03 Jun	Iberia
20 May - 13 Jun	United
19 May - 13 Jun	United
01 May - 10 May	TAP	direct
01 May - 08 May	TAP	direct
21 May - 13 Jun	United
24 May - 13 Jun	United
31 May - 08 Jun	United
31 May - 20 Jun	Finnair
25 May - 20 Jun	British Airways
23 May - 13 Jun	United
22 May - 13 Jun	United
20 May - 23 May	Scandinavian Airlines
15 May - 22 May	TAP

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

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 May from 425€

Return flights