Cheapest return flights from Boston to Bilbao in March from $347

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

Return flights

04 Mar - 11 Mar Lufthansa
10 Mar - 17 Mar Lufthansa
17 Mar - 24 Mar Lufthansa
18 Mar - 25 Mar Lufthansa
02 Mar - 09 Mar Lufthansa
09 Mar - 16 Mar Lufthansa
16 Mar - 23 Mar SWISS
03 Mar - 10 Mar Austrian Airlines
23 Mar - 30 Mar Lufthansa
01 Mar - 08 Mar Lufthansa
31 Mar - 07 Apr Iberia
30 Mar - 06 Apr TAP
25 Mar - 01 Apr Finnair
29 Mar - 05 Apr Lufthansa
28 Mar - 04 Apr Lufthansa
27 Mar - 03 Apr Lufthansa
26 Mar - 02 Apr TAP

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

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