Cheapest return flights from San Diego to Denver in April from $56

AirHint found the following cheapest return flights from San Diego (SAN) to Denver (DEN) in April 2026 (see full year).

Return flights

01 Apr - 03 Apr Frontier Airlines direct
09 Apr - 13 Apr Frontier Airlines direct
02 Apr - 13 Apr Frontier Airlines direct
09 Apr - 10 Apr Frontier Airlines direct
01 Apr - 05 Apr Frontier Airlines direct
02 Apr - 06 Apr Frontier Airlines direct
01 Apr - 06 Apr Frontier Airlines direct
10 Apr - 12 Apr Frontier Airlines direct
13 Apr - 17 Apr Frontier Airlines direct
09 Apr - 12 Apr Frontier Airlines

Also check the deals for one-way flights from San Diego to Denver in April.

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