Cheapest return flights from Ontario to San Francisco in June from $58

Best time to book flights for Ontario (ONT) to San Francisco (SFO) flights at AirHint

AirHint found the following cheapest return flights from Ontario (ONT) to San Francisco (SFO) in June 2025 (see full year).

Return flights

06 Jun - 28 Jun Frontier Airlines direct
02 Jun - 09 Jun Frontier Airlines direct
07 Jun - 14 Jun Frontier Airlines direct
05 Jun - 16 Jun Frontier Airlines direct
19 Jun - 22 Jun Frontier Airlines direct
13 Jun - 20 Jun United direct
20 Jun - 22 Jun United direct
26 Jun - 29 Jun United direct
30 Jun - 07 Jul United direct
13 Jun - 15 Jun Frontier Airlines direct
14 Jun - 15 Jun Frontier Airlines direct
28 Jun - 09 Jul Frontier Airlines
24 Jun - 03 Jul Frontier Airlines
24 Jun - 03 Jul United direct

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

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The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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