AirHint found the following cheapest return flights from San Francisco (SFO) to Denver (DEN) in May 2026 (see full year).
Return flights
| 23 May - 30 May | Alaska Airlines | ||
| 23 May - 30 May | United | direct | |
| 29 May - 31 May | United | direct | |
| 15 May - 22 May | Delta | ||
| 17 May - 24 May | Delta |
Also check the deals for one-way flights from San Francisco to Denver in May.
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