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

Return flights

26 Sep - 15 Oct	Finnair
23 Sep - 09 Oct	Delta
22 Sep - 08 Oct	Delta
24 Sep - 10 Oct	Delta
28 Sep - 14 Oct	Delta
29 Sep - 15 Oct	Delta
28 Sep - 05 Oct	Iberia
21 Sep - 07 Oct	Delta
02 Sep - 16 Sep	Frontier Airlines
17 Sep - 21 Sep	Air France
27 Sep - 13 Oct	Delta
16 Sep - 23 Sep	Spirit Airlines
20 Sep - 06 Oct	Delta
12 Sep - 24 Sep	Spirit Airlines
01 Sep - 17 Sep	Air Canada
08 Sep - 24 Sep	Air Canada
09 Sep - 25 Sep	Air Canada
02 Sep - 18 Sep	Air Canada
14 Sep - 30 Sep	Delta
06 Sep - 22 Sep	Air Canada

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 498€

Return flights