AirHint found the following cheapest return flights from Boston (BOS) to Barcelona (BCN) in September 2026 (see full year).
Return flights
| 01 Sep - 08 Sep | Scandinavian Airlines | ||
| 01 Sep - 08 Sep | Iberia | direct | |
| 06 Sep - 26 Sep | Iberia | direct |
Also check the deals for one-way flights from Boston to Barcelona in September.
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