Cheapest return flights from San Francisco to Ontario in April from 93€

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

Return flights

30 Apr - 01 May Frontier Airlines
30 Apr - 04 May Frontier Airlines
30 Apr - 03 May Frontier Airlines direct
29 Apr - 02 May Southwest Airlines
29 Apr - 09 May Southwest Airlines
30 Apr - 04 May United direct
22 Apr - 23 Apr Frontier Airlines
15 Apr - 22 Apr Frontier Airlines
13 Apr - 23 Apr Frontier Airlines
15 Apr - 21 Apr Frontier Airlines
15 Apr - 20 Apr Frontier Airlines
18 Apr - 21 Apr Frontier Airlines
16 Apr - 19 Apr Frontier Airlines
30 Apr - 06 May Southwest Airlines
13 Apr - 20 Apr Frontier Airlines
11 Apr - 15 Apr Frontier Airlines
13 Apr - 15 Apr Frontier Airlines
30 Apr - 05 May Southwest Airlines
29 Apr - 01 May Southwest Airlines
30 Apr - 02 May Southwest Airlines

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

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