Cheapest one-way flights from Boston to Barcelona in December from 221€

AirHint found the following cheapest one-way flights from Boston (BOS) to Barcelona (BCN) in December 2025 (see full year).

One-Way flights

01 Dec Iberia For Level direct
16 Dec Icelandair
18 Dec Icelandair
19 Dec Icelandair
16 Dec Finnair direct
18 Dec Finnair direct

Also check the deals for return flights from Boston to Barcelona in December.

Skyscanner

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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