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

Return flights

01 Dec - 08 Dec	IndiGo
06 Dec - 15 Dec	Frontier Airlines
02 Dec - 14 Jan	Turkish Airlines
09 Dec - 06 Jan	Spirit Airlines
04 Dec - 12 Dec	Delta
29 Dec - 12 Jan	Air India
11 Dec - 31 Dec	Spirit Airlines
06 Dec - 16 Dec	Delta
05 Dec - 12 Dec	Delta
06 Dec - 12 Dec	Delta
12 Dec - 20 Dec	Air India
17 Dec - 21 Dec	Air India
27 Dec - 31 Dec	Delta
11 Dec - 01 Jan	United
21 Dec - 11 Jan	Delta
22 Dec - 09 Jan	Delta
19 Dec - 10 Jan	Delta
11 Dec - 02 Jan	United
18 Dec - 10 Jan	United

Also check the deals for one-way flights from Chicago 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 Chicago to Singapore in December from 876€

Return flights