AirHint found the following cheapest return flights from Dallas (DAL) to Sydney (SYD) in December 2025 (see full year).
Return flights
| 30 Dec - 11 Jan | Delta | ||
| 25 Dec - 21 Jan | Delta | ||
| 08 Dec - 15 Dec | Delta | ||
| 09 Dec - 31 Dec | Delta | ||
| 10 Dec - 31 Dec | Delta | ||
| 20 Dec - 01 Jan | Delta | ||
| 17 Dec - 27 Dec | Delta |
Also check the deals for one-way flights from Dallas to Sydney in December.
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