AirHint found the following cheapest return flights from Chicago (ORD) to Lisbon (LIS) in December 2026 (see full year).
Return flights
| 24 Dec - 29 Dec | Finnair | ||
| 25 Dec - 02 Jan | British Airways | ||
| 26 Dec - 02 Jan | British Airways | ||
| 20 Dec - 30 Dec | British Airways | ||
| 23 Dec - 02 Jan | SWISS | ||
| 20 Dec - 30 Dec | TAP | direct |
Also check the deals for one-way flights from Chicago to Lisbon in December.
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