AirHint found the following cheapest return flights from St. Louis (STL) to Dallas-Fort Worth (DFW) in December 2025 (see full year).

Return flights

03 Dec - 06 Dec	Frontier Airlines
10 Dec - 13 Dec	Frontier Airlines
06 Dec - 08 Dec	Frontier Airlines
03 Dec - 10 Dec	Frontier Airlines
03 Dec - 06 Dec	American Airlines	direct
03 Dec - 10 Dec	Southwest Airlines	direct
10 Dec - 13 Dec	American Airlines	direct
11 Dec - 14 Dec	Frontier Airlines
06 Dec - 08 Dec	American Airlines	direct
11 Dec - 15 Dec	Frontier Airlines
16 Dec - 10 Jan	Southwest Airlines	direct
31 Dec - 04 Jan	American Airlines	direct
29 Dec - 02 Jan	American Airlines	direct

Also check the deals for one-way flights from St. Louis to Dallas-Fort Worth in December.

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 St. Louis to Dallas-Fort Worth in December from $110

Return flights