Cheap flights from Boston to Barcelona
Cheapest current fares: $308 in September 2026, 5,859 km direct flight in ~6h 54m.
Cheapest month-by-month fares
Lowest available fare per calendar month from Boston (BOS) to Barcelona (BCN). Refreshed daily.
Boston (BOS) → Barcelona (BCN)
- September 2026 $308
- June 2026 $327
- July 2026 $387
- May 2026 $555
Frequently asked questions
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What is the cheapest month to fly from Boston to Barcelona?
Based on current 6-month forward fare data, September 2026 is the cheapest month to fly from Boston (BOS) to Barcelona (BCN), with fares starting from $308.
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What is the lowest current fare from BOS to BCN?
The lowest currently-listed fare from Boston (BOS) to Barcelona (BCN) is $308 on 2026-09-10.
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How long is the flight from Boston to Barcelona?
Direct flights from BOS to BCN cover approximately 5,859 km (3,641 miles), with an estimated flight time of 6h 54m. Operating airlines: B6, DL, IB.
Related guides for this route
Sibling pages — full route detail, airport overviews, visa context, per-airline routes.