AirHint found the following cheapest return flights from Raleigh-durham (RDU) to Lisbon (LIS) in December 2025 (see full year).
Return flights
| 03 Dec - 10 Dec | United | ||
| 08 Dec - 15 Dec | United | ||
| 13 Dec - 20 Dec | United | ||
| 18 Dec - 25 Dec | United | ||
| 23 Dec - 30 Dec | United |
Also check the deals for one-way flights from Raleigh-durham 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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