AirHint found the following cheapest return flights from Seattle (SEA) to Sydney (SYD) in January 2026 (see full year).
Return flights
| 16 Jan - 22 Jan | Air Canada | ||
| 13 Jan - 19 Jan | Air Canada | ||
| 22 Jan - 30 Jan | Alaska Airlines | ||
| 22 Jan - 01 Feb | Alaska Airlines | ||
| 22 Jan - 02 Feb | Frontier Airlines | ||
| 18 Jan - 29 Jan | United |
Also check the deals for one-way flights from Seattle to Sydney in January.
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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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