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

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

Return flights

17 Apr - 19 Apr Frontier Airlines direct
23 Apr - 26 Apr Frontier Airlines direct
24 Apr - 26 Apr Frontier Airlines direct
14 Apr - 18 Apr Alaska Airlines direct
29 Apr - 29 Apr United direct
01 Apr - 08 Apr Alaska Airlines direct
07 Apr - 14 Apr Alaska Airlines direct
15 Apr - 17 Apr United direct
19 Apr - 22 Apr Southwest Airlines direct
16 Apr - 19 Apr Alaska Airlines direct

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

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