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Cheap flight tickets from Adelaide to Ontario International

Compare Adelaide to Ontario International flight deals

Find the cheapest month or even day of the year to fly to Ontario International

Book the best Ontario International fare with no extra fees

Flight deals from Adelaide to Ontario International

Looking for a cheap last-minute deal or the best return flight from Adelaide to Ontario International? Find the lowest prices on one-way and return tickets right here.
Ontario.RM10,216 per passenger.Departing Thu, 10 Sep, returning Thu, 8 Oct.Return flight with Qatar Airways.Outbound indirect flight with Qatar Airways, departs from Adelaide on Thu, 10 Sep, arriving in Ontario International.Inbound indirect flight with Qatar Airways, departs from Ontario International on Thu, 8 Oct, arriving in Adelaide.Price includes taxes and charges.From RM10,216, select.
Ontario.RM10,218 per passenger.Departing Wed, 25 Nov, returning Wed, 2 Dec.Return flight with Qatar Airways.Outbound indirect flight with Qatar Airways, departs from Adelaide on Wed, 25 Nov, arriving in Ontario International.Inbound indirect flight with Qatar Airways, departs from Ontario International on Wed, 2 Dec, arriving in Adelaide.Price includes taxes and charges.From RM10,218, select.
Ontario.RM10,218 per passenger.Departing Mon, 20 Apr, returning Thu, 10 Sep.Return flight with Qatar Airways.Outbound indirect flight with Qatar Airways, departs from Adelaide on Mon, 20 Apr, arriving in Ontario International.Inbound indirect flight with Qatar Airways, departs from Ontario International on Thu, 10 Sep, arriving in Adelaide.Price includes taxes and charges.From RM10,218, select.
Ontario.RM10,220 per passenger.Departing Thu, 20 Aug, returning Thu, 10 Sep.Return flight with Qatar Airways.Outbound indirect flight with Qatar Airways, departs from Adelaide on Thu, 20 Aug, arriving in Ontario International.Inbound indirect flight with Qatar Airways, departs from Ontario International on Thu, 10 Sep, arriving in Adelaide.Price includes taxes and charges.From RM10,220, select.
Ontario.RM10,220 per passenger.Departing Thu, 23 Apr, returning Thu, 7 May.Return flight with Qatar Airways.Outbound indirect flight with Qatar Airways, departs from Adelaide on Thu, 23 Apr, arriving in Ontario International.Inbound indirect flight with Qatar Airways, departs from Ontario International on Thu, 7 May, arriving in Adelaide.Price includes taxes and charges.From RM10,220, select.
Ontario.RM10,220 per passenger.Departing Mon, 3 Aug, returning Mon, 10 Aug.Return flight with Qatar Airways.Outbound indirect flight with Qatar Airways, departs from Adelaide on Mon, 3 Aug, arriving in Ontario International.Inbound indirect flight with Qatar Airways, departs from Ontario International on Mon, 10 Aug, arriving in Adelaide.Price includes taxes and charges.From RM10,220, select.
Ontario.RM10,325 per passenger.Departing Tue, 14 Jul, returning Thu, 27 Aug.Return flight with Qatar Airways.Outbound indirect flight with Qatar Airways, departs from Adelaide on Tue, 14 Jul, arriving in Ontario International.Inbound indirect flight with Qatar Airways, departs from Ontario International on Thu, 27 Aug, arriving in Adelaide.Price includes taxes and charges.From RM10,325, select.
Ontario.RM10,327 per passenger.Departing Tue, 9 Jun, returning Tue, 16 Jun.Return flight with Qatar Airways.Outbound indirect flight with Qatar Airways, departs from Adelaide on Tue, 9 Jun, arriving in Ontario International.Inbound indirect flight with Qatar Airways, departs from Ontario International on Tue, 16 Jun, arriving in Adelaide.Price includes taxes and charges.From RM10,327, select.

Find the cheapest month to fly from Adelaide to Ontario International

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Adelaide to Ontario International flights are currently cheapest in August.
Feb
from RM11,911
Mar
from RM10,653
Apr
from RM10,416
May
from RM10,653
Jun
from RM10,327
Jul
from RM10,750
Aug
from RM10,220
Sep
Find prices
Oct
from RM10,340
Nov
Find prices
Dec
from RM12,059
Jan
Find prices

Adelaide to Ontario International: Alternative routes

Compare routes from Adelaide to Ontario below. You may find an airport to fly into that's cheaper, faster, or easier than Ontario International.

Ontario International

4km from central Ontario
Closest
from RM10,216
Search flights

San Bernardino Norton AFB

39km from central Ontario
Search flights

Santa Ana John Wayne

48km from central Ontario
from RM5,485
Search flights

Long Beach Municipal

54km from central Ontario
Search flights

Hawthorne

65km from central Ontario
Search flights

Burbank

67km from central Ontario
from RM7,111
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Los Angeles International

71km from central Ontario
Cheapest
from RM2,805
Search flights

Adelaide to Ontario: Flight information

The things to know before you go.
Cheapest flight foundRM10,216
Cheapest month to flySeptember

Finding cheap flights from Adelaide to Ontario International: Frequently asked questions

The best price we found for a return flight from Adelaide to Ontario International is RM10,216. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
Currently, there are no airlines that fly direct from Adelaide to Ontario International. But we found flights with one or more stops from RM10,216.
As of February 2026, there are no flights flying from Adelaide to Ontario International.
The cheapest month to fly from Adelaide to Ontario International is usually September.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Adelaide Airport to Ontario International Airport on Thursday, 10 September 2026.
No airlines currently offer direct flights between Adelaide Airport and Ontario International Airport. Most routes have one or more stops.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Ontario International but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Ontario is around 40 days in advance, so don’t leave your flight to the last minute.
Currently, Qatar Airways offers the cheapest flight tickets to Ontario International.

Travelling from Adelaide Airport (ADL) to Ontario International Airport (ONT): what you need to know

  • Ontario's timezone is UTC-7, which makes Ontario 17 hours 30 minutes behind Adelaide.

  • Your ADL to ONT flight won't wait if you're late, so get to the airport with time to spare. Arrive up to one hour in advance for domestic flights and two hours ahead when you're travelling internationally.

  • You can expect longer lines during popular months such as January. Arriving up to four hours in advance for an international flight and two hours for domestic departures will give you ample time for security and boarding.

How to find the cheapest flights from Adelaide Airport (ADL) to Ontario International Airport (ONT)

  • Right now, RM4,215 is the cheapest price we've found for a one-way Adelaide Airport to Ontario International Airport flight. The best price for a return plane ticket is RM10,216. Keep in mind that fares may change due to availability when booking.

  • Don't wait until the last minute. You're more likely to find cheap tickets from ADL to ONT if you book ahead. Airlines often offer some terrific early bird discounts.

  • Getting cheap flights from Adelaide Airport to Ontario International Airport is more likely if you can be flexible with your trip dates. Use the 'Whole month' search tool to see the best prices throughout the month and land a great deal.

  • Getting your hands on cheap flights from ADL to ONT is a piece of cake with Price Alerts. Simply set up one of these automatic alerts and we'll let you know as soon as there's a better deal.

  • Tailor your trip with filters. Select your preferred departure and arrival times, total journey duration and airlines. You can also sort the results by 'Fastest,' 'Best' or 'Cheapest' flights from Adelaide Airport to Ontario International Airport.

Handy information about Adelaide Airport (ADL)

  • When it comes to the on-time performance of Adelaide Airport, 75.6% of flights complete their journey on time.

  • Adelaide Airport is around 8 kilometres from central Adelaide. If you're driving, catching a cab or ride-sharing from the centre, it'll take you 15 minutes or so to get there, depending on the traffic.

  • Planning to take public transport? Expect a journey time of around 50 minutes.

  • Need a convenient hotel near ADL? If you've booked an early flight from Adelaide Airport to Ontario International Airport, these accommodation options will have you moments from check-in:

Arriving at Ontario International Airport (ONT)

Getting from Ontario International Airport (ONT) to central Ontario

  • ONT is located at 2900 E. Airport Drive.

  • Ontario International Airport to central Ontario has a drive time of about 10 minutes. It's approximately 6 kilometres away.

  • It typically takes 1 hour 30 minutes when travelling by public transport.

When to fly to Ontario International Airport (ONT)

  • August is the busiest month for flights from Adelaide Airport to Ontario International Airport. To escape the crowds, head to Ontario in May.

  • Book your flight from Adelaide Airport to Ontario International Airport for August if you'd like to go to Ontario during its warmest month. Expect temperatures of between 15ºC (59ºF) and 35ºC (95ºF).

  • If you like travelling in cooler conditions, search for a cheap ticket from ADL to ONT in January. Average temperatures are between 4ºC (39ºF) and 23ºC (73ºF) then.

Explore more of United States

  • You've seen Ontario, now it's time to discover other parts of United States. Journey about 56 kilometres west to Los Angeles to check off its popular sights. From Griffith Observatory to The Broad and La Brea Tar Pits & Museum, there's plenty to keep you busy.

  • San Diego is another standout destination in United States and is around 153 kilometres south of Ontario. No trip is complete without visiting San Diego Zoo, USS Midway Museum and SeaWorld San Diego.

Plan the rest of your trip from Adelaide to Ontario

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.