Cheap flights from Washington to Sydney from $2,179 DCA, IAD → SYD
Ronald Reagan National Airport (DCA), Washington Dulles International Airport (IAD) → Sydney (Kingsford Smith) Airport (SYD)
The cheapest return found recently is $2,179 with Frontier Airlines, 16 Dec – 16 Jan 2027, found yesterday.
- Cheapest return found recently
- $2,179, 16 Dec to 16 Jan 2027
- Usual return price
- $1,879 to $2,151
- Cheapest month to fly
- November 2026, return fares from $1,761 found in the last 7 days
Return
The cheapest return fare on each of 7 departure dates is usually $1,879 to $2,151.
Cheapest return found recently
$2,179
16 Dec – 16 Jan 2027 · Frontier Airlines
Ronald Reagan National Airport (DCA) → Sydney (Kingsford Smith) Airport (SYD)
Leaves 1:40 p.m. · Return leaves 7:25 p.m. · 80 h 38 min of travel, both ways together
out 3 stops, back 3 stops
found yesterday
Cheapest nonstop return
None seen yet.
Found recently, and the cheapest we hold
$2,179 16 Dec – 16 Jan 2027found yesterdaySee prices for these dates
$1,761 16 Nov – 22 Novfound 3 days agoSee prices for these dates
What have prices looked like?
Over 46 days, 24 Sept to 12 Nov, the cheapest return we saw each day was $1,345 to $2,294.
Those were the prices on those days, not today's.
Is this a good return price?
Compared with the cheapest return fare on each of 7 departure dates from 16 Nov to 4 Jan 2027, found by travelers' searches in the last 7 days (economy, the price the seller showed on Aviasales). The usual range is the middle half of those prices.
Could nearby dates be cheaper?
We hold no other 31-night return fares leaving within 3 days of 16 Dec to compare.
Every date we hold
39 fares on 7 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 16 Nov – 22 Nov | $1,761 | Cathay Pacific | Ronald Reagan National Airport (DCA) → Sydney (Kingsford Smith) Airport (SYD) | out 2 stops, back 2 stops | found 3 days ago | See prices for these dates |
| 4 Dec – 13 Dec | $1,876 | Frontier Airlines | Ronald Reagan National Airport (DCA) → Sydney (Kingsford Smith) Airport (SYD) | out 3 stops, back 2 stops | found 3 days ago | See prices for these dates |
| 13 Dec – 22 Dec | $1,882 | Frontier Airlines | Ronald Reagan National Airport (DCA) → Sydney (Kingsford Smith) Airport (SYD) | out 3 stops, back 3 stops | found 3 days ago | See prices for these dates |
| 16 Dec – 16 Jan 2027 | $2,179 | Frontier Airlines | Ronald Reagan National Airport (DCA) → Sydney (Kingsford Smith) Airport (SYD) | out 3 stops, back 3 stops | found yesterday | See prices for these dates |
| 24 Dec – 29 Dec | $1,996 | Frontier Airlines | Washington Dulles International Airport (IAD) → Sydney (Kingsford Smith) Airport (SYD) | out 2 stops, back 3 stops | found 3 days ago | See prices for these dates |
| 1 Jan 2027 – 10 Jan 2027 | $2,123 | American Airlines | Ronald Reagan National Airport (DCA) → Sydney (Kingsford Smith) Airport (SYD) | out 1 stop, back 1 stop | found 3 days ago | See prices for these dates |
| 4 Jan 2027 – 10 Jan 2027 | $2,429 | United Airlines | Washington Dulles International Airport (IAD) → Sydney (Kingsford Smith) Airport (SYD) | out 1 stop, back 2 stops | found 3 days ago | See prices for these dates |
Which month looks cheapest?
November 2026 is the cheapest month — from $1,761.
Airlines on the cheapest dates: Frontier Airlines, Cathay Pacific, American Airlines, United Airlines.
Premium cabin fares from Washington to Sydney
We hold no premium economy, business or first-class fares for this route: we collect them for the busiest routes, and this one is not among them yet.
Today's prices for 16 Dec – 16 Jan 2027 in another cabin: Premium economy · Business · First
How far ahead were prices cheapest for Washington to Sydney?
Return
The cheapest fares were 14 to 29 days before departure.
From the cheapest return each day between 24 Sept and 12 Nov (46 days), grouped by how many days ahead the flight left; one adult in economy.
Each range covers different departure dates, so this compares typical fares, not the same trip priced twice.
Prices reflect recent searches — current fares may differ.
See these ranges as a table
| Booked ahead by | Typical fare | Cheapest day | Above the cheapest | Days of prices |
|---|---|---|---|---|
| 14–29 days | $1,345 | $1,345 | Cheapest seen | 7 |
| 30–59 days | $1,678 | $1,533 | +25% | 19 |
| 60–89 days | $2,014 | $1,536 | +50% | 24 |
| 90–179 days | $1,537 | $1,495 | +14% | 18 |
Could a nearby airport be cheaper?
A different airport at either end can change the fare — sometimes a lot.
Return
Baltimore → Sydney
57 km from Washington
$1,631
$548 less than flying from Washington
16 Nov – 22 Nov · BWI → SYD · out 2 stops, back 2 stops
found 3 days ago
Cheapest recent price on each route — round trip, per traveler in Economy. Distances are in a straight line.
Live price for these dates
The cheapest return found recently is for 16 Dec – 16 Jan 2027. A live search on this page shows what those dates cost now, for one adult in economy.
Questions about this trip
How much is a return flight from Washington to Sydney?
The cheapest return found recently is $2,179 with Frontier Airlines, 16 Dec to 16 Jan 2027, found yesterday. The cheapest return we hold, of any age, is $1,761 with Cathay Pacific, 16 Nov to 22 Nov, found 3 days ago. The cheapest return fare on each of 7 departure dates is usually $1,879 to $2,151.
What is the cheapest month to fly from Washington to Sydney?
November 2026 is the cheapest month for a return, from $1,761, 16 Nov to 22 Nov, found 3 days ago.
How far ahead should I book a flight from Washington to Sydney?
In 46 days of prices between 24 Sept and 12 Nov, return fares were cheapest 14 to 29 days before departure.
Which airlines have the cheapest flights from Washington to Sydney?
Between 16 Nov and 4 Jan 2027, Frontier Airlines has the cheapest return on 4 of the 7 departure dates we hold, Cathay Pacific on 1 and American Airlines on 1.
Prices are what travelers' searches on Aviasales found in the last 7 days, in US dollars: the price the seller showed on Aviasales; bags may cost extra. Fares change, so check today's price before you book. How our prices work