Cheapest one-way flights from San Francisco to Ontario in May from 23€

AirHint found the following cheapest one-way flights from San Francisco (SFO) to Ontario (ONT) in May 2026 (see full year).

One-Way flights

27 May Frontier Airlines direct
11 May Frontier Airlines direct
26 May Frontier Airlines direct
06 May Frontier Airlines
08 May Frontier Airlines
19 May Southwest Airlines
13 May Southwest Airlines
09 May Frontier Airlines
08 May Frontier Airlines direct
15 May Frontier Airlines direct

Also check the deals for return flights from San Francisco to Ontario in May.

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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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