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Look for other cheap flights to Ontario

$756 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 20/5. 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

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Find the cheapest flights from Australia to Ontario

Cheap return flights

Enter your travel dates to find the best prices.
United Airlines Logo
10:55 - 12:20
MEL
-
ONT
18h 25m
1 stop
United Airlines Logo
05:00 - 08:15
ONT
-
MEL
34h 15m
2 stops
$1,220United Airlines
Sun, 19 Apr - Thu, 21 May
United Airlines Logo
10:55 - 12:22
MEL
-
ONT
18h 27m
1 stop
United Airlines Logo
13:50 - 08:15
ONT
-
MEL
25h 25m
1 stop
$1,221United Airlines
Sun, 17 May - Sun, 24 May
Multiple Airlines Logo
20:45 - 21:10
SYD
-
ONT
17h 25m
1 stop
Multiple Airlines Logo
09:40 - 18:50
ONT
-
SYD
40h 10m
1 stop
$1,263Multiple Airlines
Thu, 30 Apr - Wed, 13 May
Multiple Airlines Logo
20:45 - 21:10
SYD
-
ONT
17h 25m
1 stop
Multiple Airlines Logo
09:40 - 18:50
ONT
-
SYD
40h 10m
1 stop
$1,265Multiple Airlines
Thu, 30 Apr - Wed, 13 May
Multiple Airlines Logo
20:45 - 21:10
SYD
-
ONT
17h 25m
1 stop
Multiple Airlines Logo
09:40 - 18:50
ONT
-
SYD
40h 10m
1 stop
$1,270Multiple Airlines
Thu, 30 Apr - Wed, 13 May
Multiple Airlines Logo
20:45 - 21:47
SYD
-
ONT
18h 02m
1 stop
Multiple Airlines Logo
08:00 - 18:50
ONT
-
SYD
17h 50m
1 stop
$1,281Multiple Airlines
Fri, 14 Aug - Thu, 20 Aug
Multiple Airlines Logo
20:45 - 21:28
SYD
-
ONT
17h 43m
1 stop
Multiple Airlines Logo
08:00 - 18:50
ONT
-
SYD
17h 50m
1 stop
$1,288Multiple Airlines
Sat, 29 Aug - Fri, 11 Sep
Delta Logo
10:00 - 23:44
MEL
-
ONT
30h 44m
2 stops
Delta Logo
06:00 - 07:50
ONT
-
MEL
32h 50m
2 stops
$1,312Delta
Fri, 24 Apr - Fri, 1 May
China Airlines Logo
21:50 - 18:00
MEL
-
ONT
37h 10m
1 stop
China Airlines Logo
00:10 - 10:40
ONT
-
MEL
41h 30m
1 stop
$1,679China Airlines
Tue, 21 Apr - Tue, 5 May
China Airlines Logo
21:50 - 18:40
MEL
-
ONT
37h 50m
1 stop
China Airlines Logo
00:45 - 10:40
ONT
-
MEL
40h 55m
1 stop
$1,703China Airlines
Fri, 28 Aug - Tue, 1 Sep

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 14 March 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

MelbourneOntario

MEL - ONT

MELONT

Melbourne

Sun 19/4

10:55-12:20

1 stop18h 25m

Ontario

Thu 21/5

05:00-08:15

2 stops34h 15m

$1,220

MelbourneOntario

MEL - ONT

MELONT

Melbourne

Sun 17/5

10:55-12:22

1 stop18h 27m

Ontario

Sun 24/5

13:50-08:15

1 stop25h 25m

$1,221

SydneyOntario

SYD - ONT

SYDONT

Sydney Kingsford Smith

Thu 30/4

20:45-21:10

1 stop17h 25m

Ontario

Wed 13/5

09:40-18:50

1 stop40h 10m

$1,263

SydneyOntario

SYD - ONT

SYDONT

Sydney Kingsford Smith

Thu 30/4

20:45-21:10

1 stop17h 25m

Ontario

Wed 13/5

09:40-18:50

1 stop40h 10m

$1,265

SydneyOntario

SYD - ONT

SYDONT

Sydney Kingsford Smith

Thu 30/4

20:45-21:10

1 stop17h 25m

Ontario

Wed 13/5

09:40-18:50

1 stop40h 10m

$1,270

SydneyOntario

SYD - ONT

SYDONT

Sydney Kingsford Smith

Fri 14/8

20:45-21:47

1 stop18h 02m

Ontario

Thu 20/8

08:00-18:50

1 stop17h 50m

$1,281
Fastest return journey

SydneyOntario

SYD - ONT

SYDONT

Sydney Kingsford Smith

Sat 29/8

20:45-21:28

1 stop17h 43m

Ontario

Fri 11/9

08:00-18:50

1 stop17h 50m

$1,288

MelbourneOntario

MEL - ONT

MELONT

Melbourne

Fri 24/4

10:00-23:44

2 stops30h 44m

Ontario

Fri 1/5

06:00-07:50

2 stops32h 50m

$1,312

MelbourneOntario

MEL - ONT

MELONT

Melbourne

Tue 21/4

21:50-18:00

1 stop37h 10m

Ontario

Tue 5/5

00:10-10:40

1 stop41h 30m

$1,679

MelbourneOntario

MEL - ONT

MELONT

Melbourne

Fri 28/8

21:50-18:40

1 stop37h 50m

Ontario

Tue 1/9

00:45-10:40

1 stop40h 55m

$1,703

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 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

$756

Best Round-Trip Price

$1,220

Fastest flight time

22h 38m
The best one-way flight price to Ontario from Australia in the last 72 hours is $756 (Melbourne to Ontario).
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The best round-trip flight price to Ontario from Australia in the last 72 hours is $1,220 (Melbourne to Ontario).
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The fastest flight to Ontario from Australia takes 22h 38m (Coolangatta Gold Coast 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 $69. This is 72% 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 March 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.

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 $906
Melbourne to Ontario Flightsfrom $849
Brisbane to Ontario Flightsfrom $1,261
Perth to Ontario Flightsfrom $1,058
Adelaide to Ontario Flightsfrom $1,228
Coolangatta Gold Coast to Ontario Flightsfrom $1,589