AirHint found the following cheapest return flights from Boston (BOS) to Bilbao (BIO) in April 2026 (see full year).
Return flights
| 14 Apr - 21 Apr | Iberia | ||
| 11 Apr - 18 Apr | TAP | ||
| 15 Apr - 22 Apr | Iberia | ||
| 16 Apr - 23 Apr | Frontier Airlines | ||
| 17 Apr - 24 Apr | Spirit Airlines |
Also check the deals for one-way flights from Boston to Bilbao in April.
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