Cheapest return flights from Boston to Bilbao in August from $448

AirHint found the following cheapest return flights from Boston (BOS) to Bilbao (BIO) in August 2026 (see full year).

Return flights

13 Aug - 20 Aug Iberia
17 Aug - 24 Aug KLM
04 Aug - 11 Aug Finnair
12 Aug - 19 Aug Lufthansa
14 Aug - 21 Aug Iberia
05 Aug - 12 Aug Finnair
11 Aug - 18 Aug Lufthansa
03 Aug - 10 Aug Iberia
16 Aug - 23 Aug Lufthansa
15 Aug - 22 Aug KLM

Also check the deals for one-way flights from Boston to Bilbao in August.

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