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

Return flights

29 Sep - 06 Oct	Spirit Airlines
21 Sep - 07 Oct	Air Canada
26 Sep - 03 Oct	Iberia
24 Sep - 10 Oct	Air Canada
29 Sep - 15 Oct	Air Canada
25 Sep - 02 Oct	Frontier Airlines
21 Sep - 28 Sep	Spirit Airlines
17 Sep - 03 Oct	American Airlines
22 Sep - 08 Oct	American Airlines
28 Sep - 14 Oct	Air Canada
19 Sep - 05 Oct	American Airlines
15 Sep - 22 Sep	Frontier Airlines
10 Sep - 26 Sep	Turkish Airlines
14 Sep - 30 Sep	Turkish Airlines
07 Sep - 23 Sep	Air Canada
03 Sep - 19 Sep	Air Canada
05 Sep - 21 Sep	Air Canada
12 Sep - 28 Sep	Air Canada
04 Sep - 20 Sep	American Airlines
06 Sep - 22 Sep	American Airlines

Also check the deals for one-way flights from Dallas-Fort Worth to Porto 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.

Book a cheap hotel in Porto

Cheap car rent in Porto

Cheapest return flights from Dallas-Fort Worth to Porto in September from $637

Return flights