Cheapest return PDX–IDA flights, May

AirHint found the following cheapest return flights from Portland (PDX) to Idaho Falls (IDA) in May 2026 (see full year).

Return flights

22 May - 29 May Allegiant Air direct
22 May - 01 Jun Allegiant Air direct
22 May - 25 May Allegiant Air direct
25 May - 29 May Allegiant Air direct
25 May - 01 Jun Allegiant Air direct
23 May - 28 May Frontier Airlines
23 May - 28 May Alaska Airlines direct

Also check the deals for one-way flights from Portland to Idaho Falls 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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