Cheap flights from Ontario to Sydney from $644 ONT → SYD
Ontario International Airport (ONT) → Sydney (Kingsford Smith) Airport (SYD)
The cheapest return found recently is $1,082 with United Airlines, 10 Aug 2027 – 31 Aug 2027, found yesterday. The cheapest one-way found recently is $644 with United Airlines, 30 Apr 2027, found yesterday.
- Cheapest one-way found recently
- $644, found yesterday
- Cheapest return found recently
- $1,082, 10 Aug 2027 to 31 Aug 2027
- Usual return price
- $977 to $1,118
- Cheapest month to fly
- March 2027, return fares from $964 found in the last 7 days
Return
The cheapest return fare on each of 5 departure dates is usually $977 to $1,118.
Cheapest return found recently
$1,082
10 Aug 2027 – 31 Aug 2027 · United Airlines
Ontario International Airport (ONT) → Sydney (Kingsford Smith) Airport (SYD)
Leaves 4:03 p.m. · Return leaves 8:45 p.m. · 39 h 32 min of travel, both ways together
out 1 stop, back 1 stop
found yesterday
Cheapest nonstop return
None seen yet.
Found recently, and the cheapest we hold
$1,082 10 Aug 2027 – 31 Aug 2027found yesterdaySee prices for these dates
$964 27 Mar 2027 – 14 Apr 2027found 5 days agoSee prices for these dates
What have prices looked like?
Over 50 days, 24 Sept to 12 Nov, the cheapest return we saw each day was $964 to $1,540.
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 5 departure dates from 18 Nov to 10 Aug 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 21-night return fares leaving within 3 days of 10 Aug 2027 to compare.
Every date we hold
7 fares on 5 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 18 Nov – 25 Nov | $1,118 | United Airlines | Ontario International Airport (ONT) → Sydney (Kingsford Smith) Airport (SYD) | out 1 stop, back 1 stop | found 6 days ago | See prices for these dates |
| 2 Dec – 18 Dec | $1,223 | United Airlines | Ontario International Airport (ONT) → Sydney (Kingsford Smith) Airport (SYD) | out 1 stop, back nonstop | found 3 days ago | See prices for these dates |
| 9 Mar 2027 – 30 Mar 2027 | $977 | United Airlines | Ontario International Airport (ONT) → Sydney (Kingsford Smith) Airport (SYD) | out 1 stop, back 1 stop | found 4 days ago | See prices for these dates |
| 27 Mar 2027 – 14 Apr 2027 | $964 | United Airlines | Ontario International Airport (ONT) → Sydney (Kingsford Smith) Airport (SYD) | out 1 stop, back 1 stop | found 5 days ago | See prices for these dates |
| 10 Aug 2027 – 31 Aug 2027 | $978 | United Airlines | Ontario International Airport (ONT) → Sydney (Kingsford Smith) Airport (SYD) | out 1 stop, back 1 stop | found 4 days ago | See prices for these dates |
Which month looks cheapest?
March 2027 is the cheapest month — from $964.
Airlines on the cheapest dates: United Airlines.
One-way
The cheapest one-way fare on each of 3 departure dates is usually $639 to $939.
Cheapest one-way found recently
$644
30 Apr 2027 · United Airlines
Ontario International Airport (ONT) → Sydney (Kingsford Smith) Airport (SYD)
Leaves 6:53 p.m. · 19 h 2 min trip
1 stop
found yesterday
Cheapest nonstop one-way
None seen yet.
Found recently, and the cheapest we hold
$644 30 Apr 2027found yesterdayOpen this trip
$633 1 Sept 2027found 5 days agoOpen this trip
What have prices looked like?
Over 21 days, 1 Oct to 12 Nov, the cheapest one-way we saw each day was $608 to $1,802.
21 days is a short history, so treat this range as an early guide.
Those were the prices on those days, not today's.
Is this a good one-way price?
Compared with the cheapest one-way fare on each of 3 departure dates from 30 Apr 2027 to 15 Oct 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 one-way fares leaving within 3 days of 30 Apr 2027 to compare.
Every date we hold
3 fares on 3 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 30 Apr 2027 | $644 | United Airlines | Ontario International Airport (ONT) → Sydney (Kingsford Smith) Airport (SYD) | 1 stop | found yesterday | Open this trip |
| 1 Sept 2027 | $633 | United Airlines | Ontario International Airport (ONT) → Sydney (Kingsford Smith) Airport (SYD) | 1 stop | found 5 days ago | Open this trip |
| 15 Oct 2027 | $1,233 | China Airlines | Ontario International Airport (ONT) → Sydney (Kingsford Smith) Airport (SYD) | 3 stops | found 6 days ago | Open this trip |
Which month looks cheapest?
September 2027 is the cheapest month — from $633.
Airlines on the cheapest dates: United Airlines, China Airlines.
Premium cabin fares from Ontario 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 10 Aug 2027 – 31 Aug 2027 in another cabin: Premium economy · Business · First
Today's prices for 30 Apr 2027 in another cabin: Premium economy · Business · First
How far ahead were prices cheapest for Ontario to Sydney?
Return
Fares 90 to 179 days before departure were typically 12% lower than 0 to 6 days before departure.
From the cheapest return each day between 24 Sept and 12 Nov (50 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 |
|---|---|---|---|---|
| 0–6 days | $1,177 | $1,110 | +14% | 10 |
| 7–13 days | $1,241 | $1,110 | +20% | 23 |
| 14–29 days | $1,206 | $1,073 | +17% | 20 |
| 30–59 days | $1,323 | $999 | +28% | 34 |
| 60–89 days | $1,511 | $1,145 | +46% | 23 |
| 90–179 days | $1,034 | $964 | Cheapest seen | 49 |
| 180+ days | $1,038 | $966 | +0% | 44 |
One-way
Not enough history yet: in 21 days of one-way prices, 1 Oct to 12 Nov, fewer than 3 booking ranges had prices on 7 days or more.
Could a nearby airport be cheaper?
A different airport at either end can change the fare — sometimes a lot.
Return
Los Angeles → Sydney
56 km from Ontario
$808
$274 less than flying from Ontario
10 Aug 2027 – 31 Aug 2027 · LAX → SYD · out 2 stops, back 1 stop
found yesterday
Long Beach → Sydney
60 km from Ontario
$1,566
$484 more than flying from Ontario
9 Mar 2027 – 30 Mar 2027 · LGB → SYD · out 2 stops, back 1 stop
found yesterday
Cheapest recent price on each route — round trip, per traveler in Economy. Distances are in a straight line.
One-way
Los Angeles → Sydney
56 km from Ontario
$486
$158 less than flying from Ontario
30 Apr 2027 · LAX → SYD · 1 stop
found yesterday
Long Beach → Sydney
60 km from Ontario
$960
$316 more than flying from Ontario
1 Sept 2027 · LGB → SYD · 1 stop
found 5 days ago
Cheapest recent price on each route — one way, per traveler in Economy. Distances are in a straight line.
Live price for these dates
The cheapest return found recently is for 10 Aug 2027 – 31 Aug 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 Ontario to Sydney?
The cheapest return found recently is $1,082 with United Airlines, 10 Aug 2027 to 31 Aug 2027, found yesterday. The cheapest return we hold, of any age, is $964 with United Airlines, 27 Mar 2027 to 14 Apr 2027, found 5 days ago. The cheapest return fare on each of 5 departure dates is usually $977 to $1,118.
How much is a one-way flight from Ontario to Sydney?
The cheapest one-way found recently is $644 with United Airlines, 30 Apr 2027, found yesterday. The cheapest one-way we hold, of any age, is $633 with United Airlines, 1 Sept 2027, found 5 days ago. The cheapest one-way fare on each of 3 departure dates is usually $639 to $939.
What is the cheapest month to fly from Ontario to Sydney?
March 2027 is the cheapest month for a return, from $964, 27 Mar 2027 to 14 Apr 2027, found 5 days ago. September 2027 is the cheapest month for a one-way, from $633, 1 Sept 2027, found 5 days ago.
How far ahead should I book a flight from Ontario to Sydney?
In 50 days of prices between 24 Sept and 12 Nov, return fares 90 to 179 days before departure were typically 12% lower than 0 to 6 days before departure.
How long is the flight from Ontario to Sydney?
The cheapest one-way found recently, with United Airlines on 30 Apr 2027, takes 19 h 2 min with 1 stop.
Which airlines have the cheapest flights from Ontario to Sydney?
Between 18 Nov and 10 Aug 2027, United Airlines has the cheapest return on all 5 departure dates we hold. Between 30 Apr 2027 and 15 Oct 2027, United Airlines has the cheapest one-way on 2 of the 3 departure dates we hold, and China 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