AirHint found the following cheapest return flights from San Diego (SAN) to Denver (DEN) in May 2026 (see full year).
Return flights
| 01 May - 03 May | United | direct | |
| 01 May - 07 May | Alaska Airlines | direct | |
| 24 May - 27 May | Alaska Airlines | direct | |
| 28 May - 31 May | United | direct | |
| 10 May - 20 May | United | direct |
Also check the deals for one-way flights from San Diego to Denver in May.
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