Cheapest return flights from Seattle (SEA) to Sydney (SYD)

Cheapest month: November 2026, from $ 946. Book in one tap, or open a month for every date.

All destinations from Seattle (SEA)

One-wayReturn

  • October 2026

    19–26 Oct 7 nights
    $ 1,089 return
    Alaska Airlines
    Price seen 13 Oct
    October dates

  • November 2026

    9–17 Nov 8 nights
    $ 946 return Cheapest month
    Alaska Airlines
    Price seen 12 Oct
    November dates

  • January 2027

    19–26 Jan 2027 7 nights
    $ 1,089 return
    Alaska Airlines
    Price seen 13 Oct
    January dates

  • August 2027

    1 Aug – 7 Oct 2027 67 nights
    $ 1,034 return
    Philippine Airlines
    Price seen 13 Oct
    August dates

  • September 2027

    17 Sep – 7 Oct 2027 20 nights
    $ 1,064 return
    Philippine Airlines
    Price seen 13 Oct
    September dates
Powered by

Deals for one-way flights from Seattle to Sydney.

Book a cheap hotel in Sydney

Cheap car rent in Sydney Intl

Updated Oct 13, 2026.

About these fares

These results come from our latest search across airlines for your currency. Prices change quickly and are not locked until you complete booking—always confirm the total and fare rules on the partner site.

Feel free to contact us with any feedback or request another flight research.