Cheapest return flights from Raleigh-durham to Lisbon in September from $657

AirHint found the following cheapest return flights from Raleigh-durham (RDU) to Lisbon (LIS) in September 2025 (see full year).

Return flights

29 Sep - 06 Oct Delta
30 Sep - 07 Oct Lufthansa
30 Sep - 11 Oct Frontier Airlines
25 Sep - 04 Oct Lufthansa
21 Sep - 11 Oct Frontier Airlines
25 Sep - 18 Oct British Airways
22 Sep - 18 Oct Frontier Airlines

Also check the deals for one-way flights from Raleigh-durham to Lisbon in September.

Skyscanner

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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