AirHint found the following cheapest return flights from Portland (PDX) to Bilbao (BIO) in July 2026 (see full year).

Return flights

16 Jul - 24 Jul	Alaska Airlines
22 Jul - 29 Jul	United
20 Jul - 27 Jul	KLM
21 Jul - 28 Jul	Delta
19 Jul - 27 Jul	KLM
20 Jul - 28 Jul	Delta
21 Jul - 29 Jul	Delta
22 Jul - 30 Jul	Delta
13 Jul - 21 Jul	Alaska Airlines
14 Jul - 21 Jul	Alaska Airlines

Also check the deals for one-way flights from Portland to Bilbao in July.

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.

Book a cheap hotel in Bilbao

Cheap car rent in Bilbao

Cheapest return flights from Portland to Bilbao in July from $1180

Return flights