AirHint found the following cheapest return flights from Chicago (ORD) to Lisbon (LIS) in December 2026 (see full year).
Return flights
| 15 Dec - 29 Dec | Air Canada | ||
| 16 Dec - 27 Dec | American Airlines | ||
| 16 Dec - 27 Dec | TAP | direct | |
| 19 Dec - 02 Jan | Lufthansa | ||
| 19 Dec - 03 Jan | Lufthansa |
Also check the deals for one-way flights from Chicago to Lisbon in December.
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