AirHint found the following cheapest return flights from Denver (DEN) to Las Vegas (LAS) in September 2026 (see full year).
Return flights
| 03 Sep - 07 Sep | Frontier Airlines | direct | |
| 17 Sep - 22 Sep | United | direct | |
| 10 Sep - 13 Sep | Southwest Airlines | direct | |
| 04 Sep - 09 Sep | Frontier Airlines | ||
| 25 Sep - 28 Sep | Southwest Airlines | direct |
Also check the deals for one-way flights from Denver to Las Vegas in September.
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