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

Return flights

05 Dec - 14 Dec	TAP	direct
12 Dec - 23 Dec	Air Canada
27 Dec - 07 Jan	Scandinavian Airlines
26 Dec - 31 Dec	Scandinavian Airlines
14 Dec - 21 Dec	TAP	direct
31 Dec - 04 Jan	British Airways
10 Dec - 30 Dec	TAP
25 Dec - 02 Jan	British Airways
26 Dec - 02 Jan	British Airways
18 Dec - 25 Dec	United
21 Dec - 28 Dec	TAP	direct
22 Dec - 02 Jan	Air Canada
24 Dec - 04 Jan	Scandinavian Airlines
26 Dec - 31 Dec	TAP	direct
31 Dec - 04 Jan	TAP	direct
26 Dec - 04 Jan	Icelandair
26 Dec - 03 Jan	British Airways
28 Dec - 04 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 403€

Return flights