Cheapest return flights from Ontario to San Francisco in June from $220

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

05 Jun - 12 Jun Frontier Airlines direct
06 Jun - 28 Jun Frontier Airlines direct
10 Jun - 11 Jun Southwest Airlines
04 Jun - 11 Jun Southwest Airlines
17 Jun - 19 Jun Southwest Airlines
10 Jun - 12 Jun Southwest Airlines
28 Jun - 09 Jul Southwest Airlines
20 Jun - 22 Jun Southwest Airlines
26 Jun - 05 Jul Southwest Airlines

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

Skyscanner

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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