Cheapest return flights from Seattle to Sydney in January from $1058

AirHint found the following cheapest return flights from Seattle (SEA) to Sydney (SYD) in January 2026 (see full year).

Return flights

18 Jan - 29 Jan Qantas
03 Jan - 24 Jan Hawaiian Airlines
15 Jan - 31 Jan Alaska Airlines
13 Jan - 19 Jan Hawaiian Airlines
28 Jan - 08 Feb Delta
29 Jan - 08 Feb Delta
30 Jan - 07 Feb Delta
08 Jan - 15 Jan Delta

Also check the deals for one-way flights from Seattle to Sydney in January.

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