Cheapest return PDX–SFO flights, May

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

Return flights

26 May - 26 May United direct
27 May - 02 Jun Alaska Airlines direct
26 May - 28 May United direct
28 May - 01 Jun Alaska Airlines direct
29 May - 01 Jun Alaska Airlines direct
25 May - 10 Jun United direct
23 May - 26 May United direct
25 May - 29 May Alaska Airlines direct
07 May - 10 May Frontier Airlines
22 May - 25 May United direct
23 May - 25 May United direct
21 May - 23 May United direct
18 May - 20 May United direct
15 May - 20 May Frontier Airlines

Also check the deals for one-way flights from Portland to San Francisco in May.

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