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$683+ Cheap flights to Ontario

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 23/1. Fares are subject to change and may not be available on all flights or dates of travel.
— ONT
27 Dec — 3 Jan1
1 adult
1 adult, Economy, 0 bags

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Cheapest flights to Ontario
Explore the most affordable flight options available to Ontario. Find the lowest fares based on data from user searches, with prices last updated on 27 November 2025.

Thu 27/1112:10SYD - ONT
1 stop19h 27mUnited Airlines
Tue 9/1218:41ONT - SYD
1 stop19h 34mUnited Airlines
Deal found 26/11$1,135
Thu 27/1121:40SYD - ONT
1 stop17h 51mAlaska Airlines
Tue 9/1206:00ONT - SYD
2 stops42h 45mAlaska Airlines
Deal found 26/11$1,545
Tue 25/1121:40SYD - ONT
1 stop17h 51mAlaska Airlines
Wed 18/309:50ONT - SYD
1 stop39h 55mAlaska Airlines
Deal found 25/11$1,954
Fri 28/1122:10SYD - ONT
1 stop37h 40mChina Airlines
Fri 20/323:50ONT - SYD
1 stop42h 25mChina Airlines
Deal found 25/11$2,046
Thu 25/1221:40SYD - ONT
1 stop19h 28mHawaiian Airlines
Thu 1/108:00ONT - SYD
1 stop40h 45mHawaiian Airlines
Deal found 25/11$2,068
Sat 6/1221:40SYD - ONT
1 stop17h 43mAlaska Airlines
Sat 13/1212:13ONT - SYD
2 stops60h 32mAlaska Airlines
Deal found 26/11$2,143
Thu 4/1221:40SYD - ONT
1 stop17h 43mAlaska Airlines
Thu 18/1208:00ONT - SYD
1 stop40h 45mAlaska Airlines
Deal found 25/11$2,192
Fri 5/1221:40SYD - ONT
1 stop17h 43mAlaska Airlines
Thu 18/1208:00ONT - SYD
1 stop40h 45mAlaska Airlines
Deal found 25/11$2,202
Wed 24/1214:00SYD - ONT
1 stop23h 10mUnited Airlines
Tue 6/113:53ONT - SYD
1 stop24h 22mUnited Airlines
Deal found 26/11$2,212
Thu 4/1221:40SYD - ONT
1 stop17h 43mAlaska Airlines
Tue 9/1212:13ONT - SYD
2 stops36h 32mAlaska Airlines
Deal found 24/11$2,234

Flights to Ontario in 2025

Find the latest flights to Ontario in 2025, with up-to-date prices and availability. In the last 7 days, Cheapflights users made a total of 647,157 searches and data was last updated on 27 November 2025.

Return from

$1,072

One-way from

$683

Popular in

December

Cheapest in

February

Average price

$1,247
American Airlines
  • American Airlines
  • 24/2-14/3
  • 1 total stop
  • 39h 14m total
  • Sydney to Los Angeles
Search Deals
Hawaiian Airlines
  • Hawaiian Airlines
  • 23/1
  • 1 total stop
  • 19h 48m total
  • Sydney to Ontario
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($136 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($36 potential savings vs. average return price).
Search Deals
Average for return flights in November 2025
Search Deals

Cheapflights Fare Finder

 
Locate flights to Ontario that fit your budget, with regularly updated fares and availability. In the last 7 days, Cheapflights users made a total of 647,157 searches and data was last updated on 27 November 2025.
Use the filters below to find and compare flights to Ontario that are best for you.

Fly from

Sydney

Route

Depart

Return

Price

SydneyOntario

SYD - ONT

SYDONT

Sydney Kingsford Smith

Mon 19/1

12:10-11:18

1 stop18h 08m

Ontario

Mon 2/2

13:53-06:20

1 stop21h 27m

$1,653

SydneyOntario

SYD - ONT

SYDONT

Sydney Kingsford Smith

Mon 19/1

21:40-22:28

1 stop19h 48m

Ontario

Sun 1/2

08:13-19:45

1 stop40h 32m

$1,673

SydneyOntario

SYD - ONT

SYDONT

Sydney Kingsford Smith

Fri 13/2

21:40-22:15

1 stop19h 35m

Ontario

Fri 27/2

08:41-19:45

1 stop40h 04m

$1,673

SydneyOntario

SYD - ONT

SYDONT

Sydney Kingsford Smith

Sat 17/1

21:40-22:28

1 stop19h 48m

Ontario

Sat 24/1

08:13-19:45

1 stop40h 32m

$1,751

SydneyOntario

SYD - ONT

SYDONT

Sydney Kingsford Smith

Tue 20/1

21:40-22:28

1 stop19h 48m

Ontario

Thu 29/1

11:53-19:45

2 stops36h 52m

$1,886

SydneyOntario

SYD - ONT

SYDONT

Sydney Kingsford Smith

Fri 16/1

21:40-22:28

1 stop19h 48m

Ontario

Thu 29/1

08:13-19:45

1 stop40h 32m

$1,922

SydneyOntario

SYD - ONT

SYDONT

Sydney Kingsford Smith

Mon 16/2

22:10-16:50

1 stop37h 40m

Ontario

Fri 27/2

22:50-12:15

1 stop42h 25m

$1,966

SydneyOntario

SYD - ONT

SYDONT

Sydney Kingsford Smith

Fri 16/1

12:10-11:18

1 stop18h 08m

Ontario

Fri 23/1

18:39-09:15

1 stop19h 36m

$2,063

SydneyOntario

SYD - ONT

SYDONT

Sydney Kingsford Smith

Tue 13/1

21:40-22:28

1 stop19h 48m

Ontario

Tue 20/1

11:53-19:45

2 stops36h 52m

$2,126

SydneyOntario

SYD - ONT

SYDONT

Sydney Kingsford Smith

Tue 3/2

18:25-16:50

2 stops41h 25m

Ontario

Tue 21/4

00:10-10:45

1 stop41h 35m

$2,188

Flights are sorted by cheapest return flights first.

Deals found on 26/11

Showing 1-10 of 22 results
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Best time to book a flight to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario with our price prediction graph.
Estimated return 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 to Ontario

What are the cheapest airlines that fly to Ontario?

The cheapest airline flying from Sydney to Ontario is United Airlines.

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated 27 November 2025.
Read reviews from past customers who have flown United Airlines to the United States. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,050 reviews
Check prices

Comfort

7.3

Crew

8.1

Overall

7.4

Food

6.6

Entertainment

7.1

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Anonymous,Sept 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.
United Airlines
7.4
Good
9,050 reviews
United Airlines
7.4
Good
9,050 reviews
Check prices

Comfort

7.3

Crew

8.1

Overall

7.4

Food

6.6

Entertainment

7.1

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Anonymous,Sept 2025

FRA - SFO

Lufthansa was amazing, I wish United States based airlines operated like them.

FAQs about flying to Ontario

  • What airport do you fly into for flights to Ontario?

    Most people fly into Ontario (ONT) if they book a flight to Ontario. Ontario is conveniently located just 4.9 km from Ontario’s city centre.

  • Can I find cheaper flights to Ontario if I am willing to have stopovers?

    Yes, flights with stopovers are often cheaper than direct flights. Keep an eye out for flight deals to Ontario on Cheapflights that require 1 or 2 stops for potential cost savings.

  • What is the best airline to fly to Ontario?

    Based on reviews from Cheapflights users, United Airlines is rated the highest out of the airlines that fly to Ontario.

  • Where does the fastest flight to Ontario depart from?

    For those looking to save time traveling to Ontario, Sydney Kingsford Smith offers the quickest one-way flight (16 hours 35 minutes).

  • Does Ontario have car hire?

    Yes. Those touching down at Ontario can take advantage of the car hire services offered upon their arrival.

  • Are there hotels close to Ontario?

    Yes. Ontario has hotels nearby for those requiring accommodations. Delta Hotels by Marriott Ontario Airport is the closest property to Ontario (0.0 km away from Ontario).

See more FAQs

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Users can book flights with no change fees policies with our dedicated filters. Book flights to Ontario flexibly with Cheapflights today.

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Yes! Start tracking prices for Ontario flights today and get alerted when prices change. To subscribe and begin receiving alerts, click the bell icon next to the flight deals above and provide your email address.

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