AirHint found the following cheapest return flights from Dallas (DAL) to Cancun (CUN) in September 2025 (see full year).

Return flights

21 Sep - 30 Sep	Southwest Airlines
21 Sep - 08 Oct	Aeromexico
30 Sep - 08 Oct	Aeromexico
03 Sep - 10 Sep	Aeromexico
19 Sep - 23 Sep	Southwest Airlines
24 Sep - 28 Sep	Southwest Airlines
24 Sep - 27 Sep	Southwest Airlines
06 Sep - 09 Sep	Southwest Airlines
13 Sep - 16 Sep	Southwest Airlines
10 Sep - 14 Sep	Delta
02 Sep - 20 Sep	Delta
30 Sep - 04 Oct	Delta
11 Sep - 14 Sep	Aeromexico
27 Sep - 01 Oct	Aeromexico

Also check the deals for one-way flights from Dallas to Cancun 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 to Cancun in September from 236€

Return flights