HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
South Pacific

$454+ Cheap flights from Ontario (ONT) to South Pacific

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/31. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SYD
Nov 22 — Nov 291
Sat 11/22
Sat 11/29
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Ontario to South Pacific with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Find flight deals from Ontario to South Pacific

Cheapest flights from Ontario to South Pacific
Explore the most affordable flight options available from Ontario to South Pacific. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 23, 2025.

This Alaska Airlines deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/79:47 amONT - SYD
1 stop38h 58mAlaska Airlines
Sat 11/229:40 pmSYD - ONT
1 stop17h 51mAlaska Airlines
Deal found 10/22$915
This Alaska Airlines deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/309:45 amONT - SYD
1 stop40h 00mAlaska Airlines
Thu 11/69:40 pmSYD - ONT
1 stop38h 34mAlaska Airlines
Deal found 10/22$932
This United Airlines deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/36:38 pmONT - BNE
1 stop18h 52mUnited Airlines
Sun 11/1611:40 amBNE - ONT
1 stop18h 57mUnited Airlines
Deal found 10/22$935
This United Airlines deal was found by Cheapflights users on 10/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/21:40 pmONT - BNE
1 stop23h 50mUnited Airlines
Sun 11/1611:40 amBNE - ONT
1 stop18h 57mUnited Airlines
Deal found 10/23$937
This Ticket deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Ticket is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/2511:07 amONT - RAR
1 stop14h 52mHawaiian Airlines
Sun 11/212:50 pmRAR - ONT
1 stop26h 24mHawaiian Airlines
Deal found 10/22$939
This United Airlines deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/266:38 pmONT - SYD
1 stop20h 37mUnited Airlines
Sun 11/912:10 pmSYD - ONT
1 stop19h 27mUnited Airlines
Deal found 10/22$939
This United Airlines deal was found by Cheapflights users on 10/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/76:00 amONT - SYD
2 stops30h 00mUnited Airlines
Sun 12/142:00 pmSYD - ONT
1 stop22h 37mUnited Airlines
Deal found 10/23$951
This United Airlines deal was found by Cheapflights users on 10/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/236:36 pmONT - BNE
1 stop18h 54mUnited Airlines
Thu 10/3010:40 amBNE - ONT
1 stop18h 57mUnited Airlines
Deal found 10/23$953
This United Airlines deal was found by Cheapflights users on 10/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/226:38 pmONT - SYD
1 stop19h 37mUnited Airlines
Wed 11/2612:10 pmSYD - ONT
1 stop24h 24mUnited Airlines
Deal found 10/23$954
This United Airlines deal was found by Cheapflights users on 10/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/45:05 amONT - SYD
2 stops33h 10mUnited Airlines
Sun 11/1612:10 pmSYD - ONT
1 stop19h 27mUnited Airlines
Deal found 10/23$955
This United Airlines deal was found by Cheapflights users on 10/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/16:38 pmONT - SYD
1 stop20h 37mUnited Airlines
Fri 11/712:10 pmSYD - ONT
1 stop19h 27mUnited Airlines
Deal found 10/23$957
This United Airlines deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/186:38 pmONT - AKL
1 stop17h 32mUnited Airlines
Thu 11/273:50 pmAKL - ONT
1 stop22h 44mUnited Airlines
Deal found 10/21$1,036

Cheap flight deals from Ontario to South Pacific

Keep the following information in mind while searching for Ontario to South Pacific flight deals. Data was last updated October 23, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$864
(SmartFares)

One-way from

$454
(United Airlines)

Popular in

December

Cheapest in

February

Average price

$977
Provider with most accurate pricing for Los Angeles-Sydney Kingsford Smith flight deals.
Search Deals
Provider most trusted by Cheapflights users for Los Angeles-Sydney Kingsford Smith flights.
Search Deals
From Ontario to South Pacific
Search Deals
One-way flight from Ontario to South Pacific
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($191 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($40 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to South Pacific that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated October 23, 2025.
Use the filters below to find and compare flights from Ontario to South Pacific that are best for you.

Fly from

Ontario

Fly to

South Pacific

Route

Depart

Return

Price

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Sat 1/17

8:13 am-7:45 pm

1 stop40h 32m

Sydney Kingsford Smith

Sun 3/1

9:40 pm-9:55 pm

1 stop19h 15m

$915

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Wed 2/4

8:13 am-7:45 pm

1 stop40h 32m

Sydney Kingsford Smith

Tue 3/3

9:40 pm-9:55 pm

1 stop19h 15m

$915

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Sat 1/17

8:13 am-7:45 pm

1 stop40h 32m

Sydney Kingsford Smith

Wed 1/28

9:40 pm-10:28 pm

1 stop19h 48m

$915

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Thu 2/12

9:50 am-7:45 pm

1 stop38h 55m

Sydney Kingsford Smith

Thu 2/19

9:40 pm-9:55 pm

1 stop19h 15m

$915

OntarioBrisbane

ONT - BNE

ONTBNE

Ontario

Sun 11/2

1:40 pm-7:30 am

1 stop23h 50m

Brisbane

Sun 11/16

11:40 am-12:37 pm

1 stop18h 57m

$937

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Sun 4/19

6:30 pm-6:55 am

1 stop19h 25m

Sydney Kingsford Smith

Sun 5/3

10:20 am-12:19 pm

1 stop18h 59m

$951

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Sat 11/8

6:38 pm-9:15 am

1 stop19h 37m

Sydney Kingsford Smith

Sun 11/23

12:10 pm-12:37 pm

1 stop19h 27m

$954

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Thu 12/4

6:41 pm-9:15 am

1 stop19h 34m

Sydney Kingsford Smith

Fri 12/12

12:10 pm-12:18 pm

1 stop19h 08m

$957

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Wed 12/3

6:41 pm-9:15 am

1 stop19h 34m

Sydney Kingsford Smith

Mon 12/8

11:50 am-9:49 pm

1 stop28h 59m

$961

OntarioSydney

ONT - SYD

ONTSYD

Ontario

Tue 11/18

1:40 pm-9:15 am

1 stop24h 35m

Sydney Kingsford Smith

Tue 12/9

2:00 pm-12:17 pm

1 stop17h 17m

$961

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/20

Showing 1-10 of 60 results
1
2
3
...
6

Best time to book a flight from Ontario to South Pacific

Have a flexible travel schedule? Discover the best time to fly to South Pacific from Ontario with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Ontario to South Pacific

What is the cheapest month to book a flight from Ontario to South Pacific?

Currently, April is the cheapest month in which you can book a flight from Ontario to South Pacific (average of $329). Flying from Ontario to South Pacific in September is currently the most expensive (average of $683). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from ONT to SP?

Find hourly flight availability from Ontario to South Pacific. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 23, 2025.

A simple way to save on the total cost of your ticket is to fly from Ontario to South Pacific at noon. If you’re flexible enough to do this you can expect to save up to 11% on your trip compared to booking a flight in the afternoon.

What is the cheapest day to fly from Ontario to South Pacific?

Use this chart to determine the cheapest time to fly round-trip from Ontario to South Pacific. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Ontario to South Pacific flight should consider departing on Friday at noon when fares are most often at their lowest. Tuesday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing South Pacific

Get insights into the airlines that provide service to South Pacific. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to South Pacific. Reviews last updated October 23, 2025.
Read reviews from past customers who have flown Hawaiian Airlines and United Airlines from Ontario to South Pacific. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Hawaiian Airlines
7.8
Good
2,788 reviews

Entertainment

7.1

Boarding

8.0

Crew

8.5

Food

7.0

Comfort

7.7

Overall

7.8

Reviews

1 / 20
4.0
Okay

Anonymous,Sep 2025

LAX - DCA

I booked my flight through Kayak, a third-party website, and paid extra for reserved seating. A few days before our trip, Alaska Airlines emailed to let me know that it had changed our reserved seats and separated us. I was traveling with my son who has a disability and we needed seats next to each other. So, I called Alaska and talked to an agent but she refused to give our seats back together. She blamed me for buying my tickets through a third party and said that this wouldn't have happened if I brought directly from Alaska Airlines. I was appalled by the agent's lack of empathy and ignorance of what my son's disability entails. Even though I tried explaining to her that one of the manifestations of my son's disability is high anxiety and that anxiety sky-rockets when he's in crowded places or is taken out of his routines, she just could not care less.
Hawaiian Airlines
7.8
Good
2,788 reviews
Hawaiian Airlines
7.8
Good
2,788 reviews

Entertainment

7.1

Boarding

8.0

Crew

8.5

Food

7.0

Comfort

7.7

Overall

7.8

Reviews

1 / 20
4.0
Okay

Anonymous,Sep 2025

LAX - DCA

I booked my flight through Kayak, a third-party website, and paid extra for reserved seating. A few days before our trip, Alaska Airlines emailed to let me know that it had changed our reserved seats and separated us. I was traveling with my son who has a disability and we needed seats next to each other. So, I called Alaska and talked to an agent but she refused to give our seats back together. She blamed me for buying my tickets through a third party and said that this wouldn't have happened if I brought directly from Alaska Airlines. I was appalled by the agent's lack of empathy and ignorance of what my son's disability entails. Even though I tried explaining to her that one of the manifestations of my son's disability is high anxiety and that anxiety sky-rockets when he's in crowded places or is taken out of his routines, she just could not care less.
United Airlines
7.4
Good
8,991 reviews
Hawaiian Airlines
7.8
Good
2,788 reviews

Entertainment

7.1

Boarding

8.0

Crew

8.5

Food

7.0

Comfort

7.7

Overall

7.8

Reviews

1 / 20
4.0
Okay

Anonymous,Sep 2025

LAX - DCA

I booked my flight through Kayak, a third-party website, and paid extra for reserved seating. A few days before our trip, Alaska Airlines emailed to let me know that it had changed our reserved seats and separated us. I was traveling with my son who has a disability and we needed seats next to each other. So, I called Alaska and talked to an agent but she refused to give our seats back together. She blamed me for buying my tickets through a third party and said that this wouldn't have happened if I brought directly from Alaska Airlines. I was appalled by the agent's lack of empathy and ignorance of what my son's disability entails. Even though I tried explaining to her that one of the manifestations of my son's disability is high anxiety and that anxiety sky-rockets when he's in crowded places or is taken out of his routines, she just could not care less.

Related info for your journey

Find useful and relevant information for your journey from Ontario to South Pacific. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Ontario to South Pacific?

    Most people fly from Ontario (ONT) if they book a flight from Ontario to South Pacific. Ontario is conveniently located just 3.1 mi from Ontario’s city center.

  • How long is the flight from Ontario to South Pacific?

    There are many flights that can get you from Ontario to South Pacific in 23h 50m. Fly via Alaska Airlines, United Airlines, or Qatar Airways to get the fastest option. The distance from Ontario to South Pacific is about 7207 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines to fly from Ontario to South Pacific one-way?

    To fly one-way, consider booking your trip with United Airlines, which is currently one of the cheapest options available, starting at $459. American Airlines flights start at $602 while deals on Hawaiian Airlines start at $647 one-way.

  • What are the most popular routes from Ontario to South Pacific?

    The most popular flight routes from Ontario to South Pacific are Ontario - Sydney Kingsford Smith, Ontario - Auckland Intl and Ontario - Melbourne.

  • Can I find deals for flights from Ontario to South Pacific that include hotel bookings?

    Yes. In addition to deals on Ontario to South Pacific flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to South Pacific?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to South Pacific.

  • Can I find deals for business class flights from Ontario to South Pacific?

    Yes. Cheapflights offers flight deals from Ontario to South Pacific by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Ontario to South Pacific?

    Currently, April is the cheapest month in which you can book a flight from Ontario to South Pacific (average of $329). Flying from Ontario to South Pacific in September is currently the most expensive (average of $683). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Ontario to South Pacific

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to John F Kennedy Intl flights
Los Angeles to Haneda flights
San Francisco to John F Kennedy Intl flights
Los Angeles to Seattle flights
Los Angeles to Newark flights
Los Angeles to San Francisco flights
San Francisco to Los Angeles flights
Los Angeles to Dallas/Fort Worth flights
Los Angeles to LaGuardia flights
San Francisco to Las Vegas flights
San Francisco to Newark flights
Los Angeles to Honolulu flights
Los Angeles to Narita flights
San Francisco to Santa Ana flights
San Francisco to Dallas/Fort Worth flights
Los Angeles to Las Vegas flights
Los Angeles to O'Hare Intl flights
Ontario to Seattle flights
Los Angeles to Cancún flights
San Francisco to Honolulu flights
San Francisco to Ontario flights
Los Angeles to Mexico City flights
San Francisco to LaGuardia flights
Los Angeles to Miami flights
Los Angeles to Fort Lauderdale flights
Santa Ana to San Francisco flights
San Francisco to Haneda flights
Burbank to Las Vegas flights
San Francisco to Seattle flights
Los Angeles to Boston flights
San Francisco to Mexico City flights
San Francisco to O'Hare Intl flights
San Jose to Los Angeles flights
Los Angeles to Orlando flights
Los Angeles to Manila flights
Ontario to San Francisco flights
Los Angeles to San Jose flights
Los Angeles to Denver flights
San Diego to John F Kennedy Intl flights
Santa Ana to Seattle flights
Los Angeles to Reagan-National flights
Ontario to Las Vegas flights
Los Angeles to Portland flights
San Francisco to Narita flights
San Jose to Las Vegas flights
Los Angeles to Heathrow flights
Los Angeles to Sky Harbor Intl flights
Los Angeles to San Salvador flights
Los Angeles to Hobby flights
San Francisco to Orlando flights

Top airline flying from Ontario to South Pacific

Discover the top airline that operate flights from Ontario to South Pacific. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated October 23, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$926Average$1,195FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.