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$720 Cheap flights to Ontario

1 adult
1 adult, Economy, 0 bags

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Find the cheapest flights from Australia to Ontario

Cheap return flights

Enter your travel dates to find the best prices.
Lufthansa Logo
11:20 - 12:18SYD  Sydney Kingsford Smith-ONT Ontario
18h 58m1 stop San Francisco
Lufthansa Logo
16:03 - 07:55ONT  Ontario-SYD Sydney Kingsford Smith
21h 52m1 stop San Francisco
$1,184Lufthansa
Thu, 8 Oct - Wed, 21 Oct
Multiple Airlines Logo
20:45 - 21:29SYD  Sydney Kingsford Smith-ONT Ontario
18h 44m1 stop Honolulu
Multiple Airlines Logo
07:00 - 18:50ONT  Ontario-SYD Sydney Kingsford Smith
17h 50m1 stop Honolulu
$1,192Multiple Airlines
Sat, 10 Oct - Sat, 17 Oct
Virgin Australia Logo
11:50 - 09:47SYD  Sydney Kingsford Smith-ONT Ontario
16h 57m1 stop San Francisco
Virgin Australia Logo
18:53 - 09:20ONT  Ontario-SYD Sydney Kingsford Smith
19h 27m1 stop San Francisco
$1,194Virgin Australia
Mon, 8 Feb - Mon, 15 Feb
Lufthansa Logo
11:20 - 12:18SYD  Sydney Kingsford Smith-ONT Ontario
18h 58m1 stop San Francisco
Lufthansa Logo
16:03 - 07:55ONT  Ontario-SYD Sydney Kingsford Smith
21h 52m1 stop San Francisco
$1,195Lufthansa
Thu, 8 Oct - Wed, 21 Oct
United Airlines Logo
11:20 - 12:18SYD  Sydney Kingsford Smith-ONT Ontario
18h 58m1 stop San Francisco
United Airlines Logo
16:03 - 07:55ONT  Ontario-SYD Sydney Kingsford Smith
21h 52m1 stop San Francisco
$1,197United Airlines
Thu, 8 Oct - Wed, 21 Oct
United Airlines Logo
10:20 - 12:12SYD  Sydney Kingsford Smith-ONT Ontario
18h 52m1 stop San Francisco
United Airlines Logo
16:03 - 07:55ONT  Ontario-SYD Sydney Kingsford Smith
21h 52m1 stop San Francisco
$1,197United Airlines
Wed, 23 Sep - Sun, 18 Oct
United Airlines Logo
11:50 - 09:47SYD  Sydney Kingsford Smith-ONT Ontario
16h 57m1 stop San Francisco
United Airlines Logo
18:53 - 09:20ONT  Ontario-SYD Sydney Kingsford Smith
19h 27m1 stop San Francisco
$1,197United Airlines
Mon, 8 Feb - Mon, 15 Feb
Virgin Australia Logo
11:50 - 12:29SYD  Sydney Kingsford Smith-ONT Ontario
19h 39m1 stop San Francisco
Virgin Australia Logo
16:17 - 09:20ONT  Ontario-SYD Sydney Kingsford Smith
22h 03m1 stop San Francisco
$1,199Virgin Australia
Wed, 4 Nov - Tue, 10 Nov
Virgin Australia Logo
11:50 - 09:47SYD  Sydney Kingsford Smith-ONT Ontario
16h 57m1 stop San Francisco
Virgin Australia Logo
18:53 - 09:20ONT  Ontario-SYD Sydney Kingsford Smith
19h 27m1 stop San Francisco
$1,199Virgin Australia
Mon, 8 Feb - Mon, 15 Feb
Virgin Australia Logo
11:50 - 09:47SYD  Sydney Kingsford Smith-ONT Ontario
16h 57m1 stop San Francisco
Virgin Australia Logo
18:53 - 09:20ONT  Ontario-SYD Sydney Kingsford Smith
19h 27m1 stop San Francisco
$1,201Virgin Australia
Mon, 8 Feb - Mon, 15 Feb

momondo Fare Finder

 
Use the filters below to find and compare flights to Ontario that are best for you.

Fly from

Route

Depart

Return

Price

Cheapest return flight

SydneyOntario

SYD Sydney Kingsford Smith - ONT Ontario

SYDONT

Sydney Kingsford Smith

Thu 8/10

11:20-12:18

1 stop18h 58m

Ontario

Wed 21/10

16:03-07:55

1 stop21h 52m

$1,184

SydneyOntario

SYD Sydney Kingsford Smith - ONT Ontario

SYDONT

Sydney Kingsford Smith

Sat 10/10

20:45-21:29

1 stop18h 44m

Ontario

Sat 17/10

07:00-18:50

1 stop17h 50m

$1,192
Fastest return journey

SydneyOntario

SYD Sydney Kingsford Smith - ONT Ontario

SYDONT

Sydney Kingsford Smith

Mon 8/2

11:50-09:47

1 stop16h 57m

Ontario

Mon 15/2

18:53-09:20

1 stop19h 27m

$1,194

SydneyOntario

SYD Sydney Kingsford Smith - ONT Ontario

SYDONT

Sydney Kingsford Smith

Thu 8/10

11:20-12:18

1 stop18h 58m

Ontario

Wed 21/10

16:03-07:55

1 stop21h 52m

$1,195

SydneyOntario

SYD Sydney Kingsford Smith - ONT Ontario

SYDONT

Sydney Kingsford Smith

Thu 8/10

11:20-12:18

1 stop18h 58m

Ontario

Wed 21/10

16:03-07:55

1 stop21h 52m

$1,197

SydneyOntario

SYD Sydney Kingsford Smith - ONT Ontario

SYDONT

Sydney Kingsford Smith

Wed 23/9

10:20-12:12

1 stop18h 52m

Ontario

Sun 18/10

16:03-07:55

1 stop21h 52m

$1,197

SydneyOntario

SYD Sydney Kingsford Smith - ONT Ontario

SYDONT

Sydney Kingsford Smith

Mon 8/2

11:50-09:47

1 stop16h 57m

Ontario

Mon 15/2

18:53-09:20

1 stop19h 27m

$1,197

SydneyOntario

SYD Sydney Kingsford Smith - ONT Ontario

SYDONT

Sydney Kingsford Smith

Wed 4/11

11:50-12:29

1 stop19h 39m

Ontario

Tue 10/11

16:17-09:20

1 stop22h 03m

$1,199

SydneyOntario

SYD Sydney Kingsford Smith - ONT Ontario

SYDONT

Sydney Kingsford Smith

Mon 8/2

11:50-09:47

1 stop16h 57m

Ontario

Mon 15/2

18:53-09:20

1 stop19h 27m

$1,199

SydneyOntario

SYD Sydney Kingsford Smith - ONT Ontario

SYDONT

Sydney Kingsford Smith

Mon 8/2

11:50-09:47

1 stop16h 57m

Ontario

Mon 15/2

18:53-09:20

1 stop19h 27m

$1,201

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
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See travel insights to Ontario from

Ontario flights insights and trends

Explore insights for your Ontario flight to craft the best travel plan

How long does it take to fly to Ontario?

Flight times from Australia to Ontario vary, but if you’re flying out of Sydney Kingsford Smith and flying into Los Angeles Los Angeles (one of the most popular routes), then the duration is 13h 40m on average. Another popular route from Australia to Ontario is flying from Melbourne to Los Angeles Los Angeles, which will take roughly 14h 10m. Keep in mind that layovers or delays could extend your travel time.

Cheapest flights to Ontario

Find the cheapest flights to Ontario from your nearest city or airport

Cheap Ontario flight deals and tips

Summary info about Ontario flight prices, duration and airlines

Best One-Way Price

$720

Best Round-Trip Price

$1,184

Fastest flight time

18h 17m
The best one-way flight price to Ontario from Australia in the last 5 days is $720 (Sydney Kingsford Smith to Ontario).
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The best return flight price to Ontario from Australia in the last 5 days is $1,184 (Sydney Kingsford Smith to Ontario).
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The fastest flight to Ontario from Australia takes 18h 17m (Melbourne to Ontario).
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Frequently asked questions about flying to Ontario

Is there an alternative airport near Ontario?

Finding an alternative and possibly cheaper destination airport near Ontario is possible. If you are planning a flight to Ontario, consider booking flights to Ontario Airport (5 km from Ontario city centre), San Bernardino Int Airport (38 km from Ontario city centre), Santa Ana J. Wayne/Orange Cnty Airport (47 km from Ontario city centre), Long Beach Municipal Airport (54 km from Ontario city centre) or Burbank Bob Hope Airport (67 km from Ontario city centre).

Is there a cheaper alternative to flying into Ontario?

Santa Ana J. Wayne/Orange Cnty Airport has an average price of $83 per person and is typically the cheapest airport to fly into when visiting Ontario. This average price does vary based on departure city. Try momondo’s Airport-to-Airport Pricing Tool to find the cheapest flight.

What is the absolute cheapest flight to Ontario?

The best deal found on momondo in the last two weeks was a flight to Ontario from Las Vegas for $81. This is 59% cheaper than most flight deals to Ontario. To find the cheapest price to Ontario from your area, use momondo’s Airport-to-Airport Pricing Tool.

When did momondo last update prices for flights to Ontario Airport?

Prices for flights to Ontario Airport are updated daily.

How many operators does momondo search for flights to Ontario Airport?

The number of operators available for flights to Ontario Airport is 1 as of September 2026.

How old do you have to be to fly to Ontario Airport?

The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel to Ontario Airport.

What documentation or ID do you need to fly to Ontario Airport?

The travel and health documents you'll need for your trip to Ontario Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's licence and a passport that is valid for six months after your intended arrival at Ontario Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Why use momondo?

Why should I use momondo to find a flight deal to Ontario?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight to Ontario. momondo saves you time and could save you money on your trip.

Can I find flights to Ontario with flexible booking policies on momondo?

All flight searches to Ontario on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights to Ontario?

Once all potential Ontario flight options are in front of you momondo lets you sort and filter flights based on preferences such as airline, price and flight times, amongst many other options.

I’m not ready to book a flight to Ontario right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Ontario. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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Find better results for your trip to Ontario

Popular Flights to Ontario

Sydney Kingsford Smith to Ontario Flightsfrom $854
Melbourne to Ontario Flightsfrom $940
Brisbane to Ontario Flightsfrom $927
Perth to Ontario Flightsfrom $1,250
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Coolangatta Gold Coast to Ontario Flightsfrom $1,134