There are several airlines that operate frequent flights from Seattle (SEA) to Sydney (SYD) including

• Delta Air Lines with 84 flights a week
• United Airlines with 39 flights a week
• Alaska Airlines with 35 flights a week
• Virgin Australia with 30 flights a week
• Air New Zealand with 24 flights a week

The earliest flight leaves Seattle Tacoma Intl. Airport at 08:00 and arrives at Kingsford Smith Intl. Airport at 05:35. The last flight of the day departs Seattle at 21:29 and arrives at Sydney at 20:05.

The flight distance from Seattle to Sydney is about 13435 km, the shortest flight is 17 hours 30 minutes with WestJet.

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