Frontier AirlinesDepart22:33
Tue, Dec 1IAD → SYD
29h 13m · 3 stops
$728one way, per person
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- Cheapest fare
- $728
- Cheapest month
- December
- Direct flights
- Not recently
- Quickest trip
- 20h 36m
Frontier Airlines · Tue, Dec 1
from $728
Usually 1+ stop
15,710 km
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Cheapest month to fly from Washington to Sydney
Lowest one-way fare per person in each month. Choose a month to see every date.
Cheapest dates in December 2026
The lowest fares we've seen for each day, cheapest first.
Frontier Airlines
American AirlinesDepart06:00
Sun, Dec 27IAD → SYD
21h 54m · 2 stops
$1,218one way, per person
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Getting around
About flights from Washington to Sydney
Washington (WAS) and Sydney (SYD) are about 15,710 km apart. We haven't seen direct fares on this route recently, so expect at least one stop; the quickest journey we've seen takes about 20h 36m. Over the next few months, one-way fares start from $728, and December 2026 is currently the cheapest month to fly.
These prices come from searches travellers made in the last 48 hours, so they move quickly. If you see a good fare, it's worth booking soon. FlightsExp is free to use: you book directly with our travel partner.
Frequently asked questions
How much is a flight from Washington to Sydney?
The cheapest one-way fare we've seen recently is $728 with Frontier Airlines, departing Tuesday, December 1, 2026. Over the coming months, the lowest fare in each month ranges from $728 to $877.
What is the cheapest month to fly from Washington to Sydney?
December 2026 currently has the lowest fares, from $728 one way.
Are there direct flights from Washington to Sydney?
We haven't seen direct fares recently, so most journeys include at least one stop.
How long is the flight from Washington to Sydney?
The quickest journey we've seen takes about 20h 36m. Washington and Sydney are around 15,710 km apart.
Which airlines fly from Washington to Sydney?
Recent fares on this route were with Frontier Airlines, Alaska Airlines and American Airlines.
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