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

One-Way flights

30 Dec	Iberia For Level	direct
08 Dec	Iberia For Level	direct
10 Dec	Spirit Airlines
16 Dec	Iberia	direct
13 Dec	Iberia For Level	direct
24 Dec	British Airways
20 Dec	British Airways
19 Dec	British Airways
22 Dec	Brussels Airlines
21 Dec	Iberia For Level	direct

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

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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Cheapest one-way flights from Boston to Barcelona in December from 172€

One-Way flights