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

Return flights

02 Dec - 12 Dec	British Airways
05 Dec - 19 Dec	TAP	direct
26 Dec - 31 Dec	Lufthansa
25 Dec - 30 Dec	Lufthansa
03 Dec - 10 Dec	TAP	direct
14 Dec - 31 Dec	Finnair
17 Dec - 31 Dec	Air Canada
18 Dec - 10 Jan	Scandinavian Airlines
14 Dec - 31 Dec	TAP	direct
21 Dec - 31 Dec	Air Canada
26 Dec - 31 Dec	TAP	direct
28 Dec - 02 Jan	Scandinavian Airlines
17 Dec - 03 Jan	Spirit Airlines
29 Dec - 03 Jan	SWISS
23 Dec - 02 Jan	Spirit Airlines
26 Dec - 04 Jan	Lufthansa
26 Dec - 02 Jan	TAP	direct
21 Dec - 03 Jan	Scandinavian Airlines
28 Dec - 02 Jan	TAP	direct

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

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 December from 387€

Return flights