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

Return flights

12 Aug - 28 Aug	Air Canada
17 Aug - 02 Sep	Air Canada
19 Aug - 04 Sep	Air Canada
13 Aug - 29 Aug	Air Canada
20 Aug - 05 Sep	Air Canada
10 Aug - 26 Aug	Air Canada
17 Aug - 27 Aug	American Airlines
03 Aug - 19 Aug	American Airlines
18 Aug - 03 Sep	Air Canada
20 Aug - 31 Aug	Air Canada
15 Aug - 27 Aug	American Airlines
04 Aug - 20 Aug	American Airlines
09 Aug - 25 Aug	Air Canada
08 Aug - 24 Aug	Air Canada
29 Aug - 09 Sep	Spirit Airlines
21 Aug - 02 Sep	American Airlines
27 Aug - 08 Sep	Turkish Airlines
24 Aug - 09 Sep	Air Canada
26 Aug - 11 Sep	Air Canada
16 Aug - 01 Sep	Delta

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

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 Porto in August from $729

Return flights