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

Return flights

22 Sep - 08 Oct	Air Canada
24 Sep - 01 Oct	British Airways
23 Sep - 30 Sep	Finnair
17 Sep - 24 Sep	American Airlines
29 Sep - 15 Oct	American Airlines
19 Sep - 26 Sep	Finnair
30 Sep - 07 Oct	United
21 Sep - 01 Oct	American Airlines
23 Sep - 09 Oct	Delta
28 Sep - 14 Oct	Delta
30 Sep - 16 Oct	Delta
27 Sep - 04 Oct	Air France
21 Sep - 07 Oct	Delta
10 Sep - 17 Sep	Air Canada
21 Sep - 28 Sep	Air Canada
15 Sep - 22 Sep	Spirit Airlines
08 Sep - 15 Sep	Air Canada
01 Sep - 23 Sep	Frontier Airlines
04 Sep - 11 Sep	Spirit Airlines
03 Sep - 24 Sep	Spirit 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 $580

Return flights