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

Return flights

03 Dec - 12 Jan	Icelandair
03 Dec - 11 Dec	Air Canada
03 Dec - 10 Dec	Air Canada
02 Dec - 16 Dec	Air Canada
02 Dec - 09 Dec	Air Canada
09 Dec - 23 Dec	SWISS
01 Dec - 08 Dec	Air Canada
08 Dec - 22 Dec	Air Canada
09 Dec - 17 Dec	Air Canada
01 Dec - 16 Dec	Air Canada
03 Dec - 24 Dec	Air Canada
23 Dec - 06 Jan	Air Canada
24 Dec - 07 Jan	Air Canada
18 Dec - 19 Jan	Air Canada
03 Dec - 12 Jan	Turkish Airlines	direct
21 Dec - 02 Jan	Icelandair
24 Dec - 07 Jan	Turkish Airlines	direct
23 Dec - 06 Jan	Turkish Airlines	direct

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 $428

Return flights