AirHint found the following cheapest return flights from Boston (BOS) to Istanbul (IST) in December 2025 (see full year).

Return flights

31 Dec - 16 Jan	Icelandair
02 Dec - 09 Dec	Delta
01 Dec - 10 Dec	TAP
03 Dec - 17 Dec	British Airways
30 Dec - 16 Jan	British Airways
24 Dec - 16 Jan	Icelandair
27 Dec - 16 Jan	Icelandair
09 Dec - 14 Dec	Aer Lingus
13 Dec - 23 Jan	Icelandair
29 Dec - 16 Jan	Lufthansa
29 Dec - 17 Jan	Iberia
29 Dec - 18 Jan	Iberia
11 Dec - 13 Jan	Iberia
02 Dec - 05 Dec	Scandinavian Airlines
10 Dec - 14 Dec	TAP
04 Dec - 08 Dec	Scandinavian Airlines
06 Dec - 20 Dec	Iberia
09 Dec - 12 Dec	Aer Lingus
04 Dec - 09 Dec	SWISS
13 Dec - 09 Jan	Icelandair

Also check the deals for one-way flights from Boston to Istanbul 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 return flights from Boston to Istanbul in December from 443€

Return flights