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Look for other cheap flights to Ontario

$693 Cheap flights to Ontario

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight to Ontario departing on 14/7. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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.
Multiple Airlines Logo
20:45 - 22:10
SYD
-
ONT
18h 25m
1 stop
Multiple Airlines Logo
09:31 - 18:50
ONT
-
SYD
40h 19m
1 stop
$1,085Multiple Airlines
Thu, 3 Sep - Thu, 10 Sep
Multiple Airlines Logo
20:45 - 21:45
SYD
-
ONT
18h 00m
1 stop
Multiple Airlines Logo
07:00 - 18:50
ONT
-
SYD
17h 50m
1 stop
$1,090Multiple Airlines
Thu, 30 Jul - Mon, 19 Oct
Multiple Airlines Logo
17:25 - 21:32
MEL
-
ONT
23h 07m
2 stops
Multiple Airlines Logo
09:00 - 07:35
ONT
-
MEL
51h 35m
2 stops
$1,124Multiple Airlines
Tue, 17 Nov - Tue, 9 Feb
Multiple Airlines Logo
20:45 - 21:45
SYD
-
ONT
18h 00m
1 stop
Multiple Airlines Logo
09:11 - 18:50
ONT
-
SYD
40h 39m
1 stop
$1,138Multiple Airlines
Thu, 23 Jul - Thu, 30 Jul
Multiple Airlines Logo
20:45 - 21:45
SYD
-
ONT
18h 00m
1 stop
Multiple Airlines Logo
07:00 - 18:50
ONT
-
SYD
17h 50m
1 stop
$1,140Multiple Airlines
Thu, 30 Jul - Thu, 22 Oct
Multiple Airlines Logo
20:45 - 21:22
SYD
-
ONT
18h 37m
1 stop
Multiple Airlines Logo
07:00 - 18:50
ONT
-
SYD
17h 50m
1 stop
$1,198Multiple Airlines
Tue, 20 Oct - Wed, 21 Oct
United Airlines Logo
10:20 - 12:12
SYD
-
ONT
18h 52m
1 stop
United Airlines Logo
05:00 - 06:55
ONT
-
SYD
56h 55m
2 stops
$1,204United Airlines
Thu, 10 Sep - Mon, 14 Sep
United Airlines Logo
10:20 - 12:12
SYD
-
ONT
18h 52m
1 stop
United Airlines Logo
18:39 - 06:55
ONT
-
SYD
19h 16m
1 stop
$1,205United Airlines
Mon, 13 Jul - Wed, 29 Jul
United Airlines Logo
10:20 - 12:12
SYD
-
ONT
18h 52m
1 stop
United Airlines Logo
05:00 - 06:55
ONT
-
SYD
56h 55m
2 stops
$1,210United Airlines
Thu, 10 Sep - Mon, 14 Sep
Delta Logo
10:00 - 23:48
MEL
-
ONT
30h 48m
2 stops
Delta Logo
17:10 - 07:50
ONT
-
MEL
45h 40m
2 stops
$1,345Delta
Sun, 26 Jul - Sun, 2 Aug

momondo Fare Finder

 
Locate flights to Ontario that fit your budget, with regularly updated fares and availability. In the last 7 days, momondo users made a total of 78,305 searches and data was last updated on 12 June 2026.
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 - ONT

SYDONT

Sydney Kingsford Smith

Thu 3/9

20:45-22:10

1 stop18h 25m

Ontario

Thu 10/9

09:31-18:50

1 stop40h 19m

$1,085
Fastest return journey

SydneyOntario

SYD - ONT

SYDONT

Sydney Kingsford Smith

Thu 30/7

20:45-21:45

1 stop18h 00m

Ontario

Mon 19/10

07:00-18:50

1 stop17h 50m

$1,090

MelbourneOntario

MEL - ONT

MELONT

Melbourne

Tue 17/11

17:25-21:32

2 stops23h 07m

Ontario

Tue 9/2

09:00-07:35

2 stops51h 35m

$1,124

SydneyOntario

SYD - ONT

SYDONT

Sydney Kingsford Smith

Thu 23/7

20:45-21:45

1 stop18h 00m

Ontario

Thu 30/7

09:11-18:50

1 stop40h 39m

$1,138

SydneyOntario

SYD - ONT

SYDONT

Sydney Kingsford Smith

Thu 30/7

20:45-21:45

1 stop18h 00m

Ontario

Thu 22/10

07:00-18:50

1 stop17h 50m

$1,140

SydneyOntario

SYD - ONT

SYDONT

Sydney Kingsford Smith

Tue 20/10

20:45-21:22

1 stop18h 37m

Ontario

Wed 21/10

07:00-18:50

1 stop17h 50m

$1,198

SydneyOntario

SYD - ONT

SYDONT

Sydney Kingsford Smith

Thu 10/9

10:20-12:12

1 stop18h 52m

Ontario

Mon 14/9

05:00-06:55

2 stops56h 55m

$1,204

SydneyOntario

SYD - ONT

SYDONT

Sydney Kingsford Smith

Mon 13/7

10:20-12:12

1 stop18h 52m

Ontario

Wed 29/7

18:39-06:55

1 stop19h 16m

$1,205

SydneyOntario

SYD - ONT

SYDONT

Sydney Kingsford Smith

Thu 10/9

10:20-12:12

1 stop18h 52m

Ontario

Mon 14/9

05:00-06:55

2 stops56h 55m

$1,210

MelbourneOntario

MEL - ONT

MELONT

Melbourne

Sun 26/7

10:00-23:48

2 stops30h 48m

Ontario

Sun 2/8

17:10-07:50

2 stops45h 40m

$1,345

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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 15m. 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

$693

Best Round-Trip Price

$1,085

Fastest flight time

21h 47m
The best one-way flight price to Ontario from Australia in the last 5 days is $693 (Sydney Kingsford Smith to Ontario).
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The best round-trip flight price to Ontario from Australia in the last 5 days is $1,085 (Sydney Kingsford Smith to Ontario).
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The fastest flight to Ontario from Australia takes 21h 47m (Brisbane 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 $85 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 San Francisco for $117. This is 55% 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 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.

An easier way to manage your Ontario trip

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Find better results for your trip to Ontario

Popular Flights to Ontario

Popular routes according to searches in the past day on momondo
Sydney Kingsford Smith to Ontario Flightsfrom $840
Melbourne to Ontario Flightsfrom $788
Brisbane to Ontario Flightsfrom $941
Perth to Ontario Flightsfrom $1,351
Coolangatta Gold Coast to Ontario Flightsfrom $1,161
Adelaide to Ontario Flightsfrom $1,153