Cheapest one-way PDX–SFO flights, May

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

One-Way flights

27 May Alaska Airlines direct
30 May Alaska Airlines direct
28 May United direct
22 May Frontier Airlines
21 May Frontier Airlines
23 May Frontier Airlines
14 May Frontier Airlines
07 May Frontier Airlines
10 May Frontier Airlines
08 May Frontier Airlines

Also check the deals for return flights from Portland to San Francisco 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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