AirHint found the following cheapest return flights from Seattle (SEA) to Sydney (SYD) in July 2025 (see full year).

Return flights

31 Jul - 27 Aug	Alaska Airlines
31 Jul - 13 Aug	Alaska Airlines
29 Jul - 05 Aug	Qantas
09 Jul - 16 Jul	United
10 Jul - 22 Jul	United
25 Jul - 04 Aug	Alaska Airlines
25 Jul - 01 Aug	Alaska Airlines
18 Jul - 31 Jul	Hawaiian Airlines

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

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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Cheapest return flights from Seattle to Sydney in July from 703€

Return flights