AirHint found the following cheapest return flights from Dallas (DAL) to Houston (HOU) in December 2025 (see full year).
Return flights
| 11 Dec - 16 Dec | Southwest Airlines | direct | |
| 06 Dec - 07 Dec | Southwest Airlines | direct | |
| 11 Dec - 14 Dec | Southwest Airlines | direct | |
| 21 Dec - 28 Dec | Southwest Airlines | direct |
Also check the deals for one-way flights from Dallas to Houston in December.
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