AirHint found the following cheapest return flights from Dallas-Fort Worth (DFW) to Lisbon (LIS) in September 2025 (see full year).

Return flights

21 Sep - 30 Sep	Finnair
19 Sep - 26 Sep	Finnair
29 Sep - 13 Oct	Finnair
21 Sep - 07 Oct	Delta
22 Sep - 08 Oct	Delta
23 Sep - 09 Oct	Delta
28 Sep - 14 Oct	Delta
30 Sep - 16 Oct	Delta
29 Sep - 06 Oct	United
29 Sep - 15 Oct	Delta
21 Sep - 29 Sep	Delta
17 Sep - 01 Oct	Air France
17 Sep - 24 Sep	Air France
24 Sep - 10 Oct	Delta
20 Sep - 27 Sep	Air France
02 Sep - 08 Sep	Frontier Airlines
02 Sep - 10 Sep	Frontier Airlines
09 Sep - 15 Sep	Frontier Airlines
14 Sep - 20 Sep	Frontier Airlines
06 Sep - 12 Sep	Frontier Airlines

Also check the deals for one-way flights from Dallas-Fort Worth to Lisbon in September.

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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Cheapest return flights from Dallas-Fort Worth to Lisbon in September from 490€

Return flights