AirHint found the following cheapest return flights from San Diego (SAN) to Sydney (SYD) in September 2026 (see full year).
Return flights
| 16 Sep - 02 Oct | Frontier Airlines | ||
| 15 Sep - 29 Sep | United | ||
| 01 Sep - 07 Sep | Alaska Airlines | ||
| 18 Sep - 21 Sep | Frontier Airlines |
Also check the deals for one-way flights from San Diego to Sydney in September.
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