AirHint found the following cheapest return flights from Tulsa (TUL) to Denver (DEN) in December 2025 (see full year).
Return flights
| 20 Dec - 21 Dec | Southwest Airlines | direct | |
| 18 Dec - 22 Dec | Delta | ||
| 18 Dec - 22 Dec | United | direct | |
| 12 Dec - 15 Dec | Southwest Airlines | direct |
Also check the deals for one-way flights from Tulsa to Denver in December.
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