AirHint found the following cheapest one-way flights from Portland (PDX) to San Francisco (SFO) in August 2025 (see full year).

One-Way flights

14 Aug	United	direct
12 Aug	United	direct
21 Aug	United	direct
28 Aug	United	direct
19 Aug	United	direct
30 Aug	United	direct
13 Aug	United	direct
25 Aug	United	direct
23 Aug	United	direct
16 Aug	United	direct

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

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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Cheapest one-way flights from Portland to San Francisco in August from 33€

One-Way flights