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

Return flights

04 Dec - 15 Jan	Turkish Airlines
05 Dec - 15 Jan	Turkish Airlines
06 Dec - 13 Dec	Frontier Airlines
11 Dec - 31 Dec	Qatar Airways
25 Dec - 30 Dec	Delta
25 Dec - 08 Jan	Delta
17 Dec - 28 Dec	Aer Lingus
22 Dec - 29 Dec	Finnair
18 Dec - 27 Dec	jetBlue
19 Dec - 29 Dec	Qatar Airways
19 Dec - 28 Dec	Qatar Airways
17 Dec - 30 Dec	Aer Lingus
14 Dec - 21 Dec	Delta
22 Dec - 05 Jan	Air India
19 Dec - 02 Jan	Qatar Airways
22 Dec - 09 Jan	Delta
19 Dec - 04 Jan	Qatar Airways
25 Dec - 04 Jan	jetBlue
21 Dec - 10 Jan	Delta
17 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 $971

Return flights