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

Return flights

03 Dec - 10 Dec	United
11 Dec - 23 Dec	Delta
11 Dec - 24 Dec	Delta
11 Dec - 26 Dec	Delta
11 Dec - 27 Dec	Delta
11 Dec - 28 Dec	Delta
01 Dec - 06 Dec	Delta
12 Dec - 27 Dec	Delta
19 Dec - 14 Jan	IndiGo
18 Dec - 29 Dec	IndiGo
18 Dec - 30 Dec	Delta
20 Dec - 04 Jan	Delta

Also check the deals for one-way flights from Boston to Singapore 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 Singapore in December from 769€

Return flights