AirHint found the following cheapest return flights from Raleigh-durham (RDU) to Lisbon (LIS) in August 2025 (see full year).
Return flights
| 26 Aug - 02 Sep | United | ||
| 22 Aug - 29 Aug | United | ||
| 28 Aug - 04 Sep | United | ||
| 30 Aug - 06 Sep | United | ||
| 24 Aug - 31 Aug | United |
Also check the deals for one-way flights from Raleigh-durham to Lisbon in August.
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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