AirHint found the following cheapest return flights from Sydney (SYD) to Keflavik (KEF) in December 2025 (see full year).
Return flights
| 31 Dec - 10 Jan | Etihad Airways | ||
| 25 Dec - 02 Jan | Qantas | ||
| 20 Dec - 31 Dec | Qantas | ||
| 20 Dec - 03 Jan | British Airways |
Also check the deals for one-way flights from Sydney to Keflavik in December.
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