International route
Cheap flights from Seattle to Sydney
Seattle-Tacoma International Airport (SEA) to Sydney Kingsford Smith Airport (SYD). 7,750 miles, 16h nonstop.
SEA to SYD at a glance
Computed from airline schedules and the fares we track for this route. Refreshed several times a day.
- Distance
- 7,750 milesgreat-circle
- Typical flight time
- 16hnonstop, gate to gate
- Nonstop airlines
- DLQF2 airlinesDelta, Qantas
- Nonstop flights per day
- 2all airlines combined
- Cheapest month
- January 2027over the next six months
- Best day to fly
- Wednesday18% less than Friday
- Time difference
- 17h aheadSydney vs Seattle
Seattle to Sydney
Round trips from $602
Per traveler, taxes and fees included. Lowest fare we found departs Tue, Jan 5.
Cheapest month: January 2027
See fares on these datesLock any fare free — pay only when you accept your last-minute deal
Or ask an agent on WhatsAppSeattle to Sydney fares by month
Lowest round-trip economy fare per traveler in each of the next six months, taxes and fees included. Select a month to search that date.
Airlines flying Seattle to Sydney
2 airlines fly nonstop with 2 departures a day combined, plus 13 more with one stop.
- DLDelta Air LinesSkyTeamNonstop · 1 flight a day · first checked bag from $35
- QFQantasoneworldNonstop · 1 flight a day · first checked bag included
- AMAeroméxicoSkyTeamConnecting via MEX, MTY, GDL · first checked bag from $40
- ACAir CanadaStar AllianceConnecting via YVR, YYC · first checked bag from $35
- NZAir New ZealandStar AllianceConnecting via AKL · first checked bag included
- ASAlaska AirlinesoneworldConnecting via PDX, ANC, SFO, SAN · first checked bag from $35
- AAAmerican AirlinesoneworldConnecting via DFW, PHX · first checked bag from $40
- CIChina AirlinesSkyTeamConnecting via TPE · first checked bag included
- BREVA AirStar AllianceConnecting via TPE · first checked bag included
- FJFiji AirwaysoneworldConnecting via NAN · first checked bag included
- JLJapan AirlinesoneworldConnecting via HND · first checked bag included
- UAUnited AirlinesStar AllianceConnecting via DEN, IAH, SFO, LAX · first checked bag from $40
- VBVivaLow-costConnecting via MTY, GDL · first checked bag from $45
- Y4VolarisLow-costConnecting via CUN · first checked bag from $45
- WSWestJetConnecting via YVR · first checked bag from $35
Connecting options
Hubs where one airline can carry you on both legs, most choices first.
- San Francisco (SFO)UAAS2 airlines
- Vancouver (YVR)ACWS2 airlines
- Monterrey (MTY)AMVB2 airlines
- Guadalajara (GDL)AMVB2 airlines
- Taipei (TPE)BRCI2 airlines
Tips for this route
- Only Delta and Qantas fly this route nonstop, which keeps nonstop fares firm. A one-stop itinerary through SFO or YVR is usually cheaper if you can spare the extra three to five hours.
- January 2027 is the cheapest month to fly over the next six months, with round trips from $602; September 2026 is the most expensive at $828 and up, a difference of $226 per traveler.
- Departing on a Wednesday averages 18% less than a Friday on this route. If your dates are flexible, shift the outbound by a day or two and check the calendar view before you book.
- Book 2 to 5 months ahead for the best fares; long-haul seats sell out earliest for summer and holiday travel.
- Sydney is 17 hours ahead of Seattle. Expect to lose 17 hours on the clock heading east, so an overnight or late-afternoon departure tends to arrive at a more usable hour.
Destination guide
Sydney: Harbor, surf beaches and 14 hours from LA
Sydney is the far end of the map for US travelers, but nonstops from Los Angeles, San Francisco, Dallas, Houston and New York make it a single long flight. The harbor, the Opera House, Bondi to Coogee and the Blue Mountains reward the journey.
Best time to visit: October–November and March–April (Southern Hemisphere spring and fall) are warm and less crowded. December–February is summer — beach season, school holidays and peak fares. June–August is mild and cheap.
Flying the other way? Sydney to SeattleFares, airlines and tips for SYD to SEA.Ready to compare live fares?
See every airline on SEA–SYD side by side with bags and seat rules spelled out.
Search Seattle to SydneySeattle to Sydney: common questions
How long is the flight from Seattle to Sydney?
A nonstop flight from Seattle (SEA) to Sydney (SYD) takes about 16h gate to gate, covering 7,750 miles. Connecting itineraries add the layover, typically 2 to 5 hours more in total.
Which airlines fly nonstop from SEA to SYD?
Delta Air Lines and Qantas operate nonstop flights from Seattle (SEA) to Sydney (SYD), with 2 nonstop departures a day between them. One-stop options connect through SFO, YVR and MTY.
What is the cheapest month to fly from Seattle to Sydney?
Over the next six months, January 2027 has the lowest round-trip fares from Seattle (SEA) to Sydney (SYD), starting at $602 per traveler including taxes and fees. Within any month, Wednesday departures average the lowest prices.
How far in advance should I book Seattle to Sydney flights?
Book 2 to 5 months ahead for the best fares; long-haul seats sell out earliest for summer and holiday travel. Air1 Tickets includes free cancellation within 24 hours of booking on every fare, so you can lock in a good price and keep looking.
What is the time difference between Seattle and Sydney?
Sydney is 17 hours ahead of Seattle. SEA is on America/Los Angeles time and SYD on Australia/Sydney time. Departure and arrival times in search results are always shown in local time at each airport.
Related routes
Other popular city pairs from the same departure city and to the same destination, with the lowest round-trip fares we found.