Cheapest return flights from Boston to Bilbao in May from $394

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

Return flights

08 May - 17 May TAP
05 May - 11 May TAP
12 May - 19 May KLM
11 May - 18 May TAP
09 May - 16 May TAP
18 May - 25 May KLM
21 May - 28 May KLM
24 May - 31 May TAP
23 May - 30 May TAP
22 May - 29 May Iberia

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

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