AirHint found the following cheapest one-way flights from Chicago (ORD) to Singapore (SIN) in December 2025 (see full year).
One-Way flights
| 31 Dec | Air India | ||
| 28 Dec | IndiGo | ||
| 06 Dec | American Airlines | ||
| 26 Dec | Air India | ||
| 16 Dec | IndiGo | ||
| 21 Dec | IndiGo | ||
| 19 Dec | Delta | ||
| 20 Dec | IndiGo | ||
| 18 Dec | IndiGo |
Also check the deals for return flights from Chicago to Singapore in December.
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