Find flights
Deals

$134+ Cheap flights from Ontario

This is the cheapest return flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 3/12. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
ONT — AKL
2 Dec — 9 Dec1
1 adult
1 adult, Economy, 0 bags

What to know about flights from Ontario

Discover essential information about flights departing from Ontario, including flight schedules, destinations, airlines operating at the Ontario airport, and any specific guidelines or requirements for travellers. Please note that the information is based on the most recent updates available. Data last updated 2 November 2025.

Cheapest one-way flight

$706

Cheapest airline

Spirit Airlines

Most popular destination

Nadi (NAN)
The cheapest one-way flight from Ontario is currently to Nadi.
Search Deals
On average, Spirit Airlines currently has the cheapest one-way flight from Ontario (avg. price of $115).
Search Deals
Nadi (NAN) is currently the most popular flight destination from Ontario (average return price of $949).
Search Deals

Find flights from Ontario

Enter your travel dates to find the best prices.

Cheapest flights from Ontario
Explore the most affordable flight options available from Ontario. Find the lowest fares based on data from user searches, with prices last updated on 2 November 2025.

Wed 3/1207:10ONT - PDX
Nonstop2h 31mAlaska Airlines
Tue 6/109:49PDX - ONT
Nonstop2h 19mAlaska Airlines
Deal found 31/10$274
Wed 24/1218:05ONT - PDX
Nonstop2h 25mAlaska Airlines
Fri 2/121:38PDX - ONT
Nonstop2h 21mAlaska Airlines
Deal found 31/10$292
Tue 9/1206:00ONT - PDX
1 stop4h 50mAlaska Airlines
Tue 9/1213:34PDX - ONT
1 stop4h 59mAlaska Airlines
Deal found 1/11$299
Wed 3/1215:55ONT - PDX
1 stop4h 00mSouthwest
Tue 6/105:05PDX - ONT
2 stops7h 20mSouthwest
Deal found 31/10$300
Tue 16/1206:00ONT - PDX
1 stop7h 50mAlaska Airlines
Tue 6/110:45PDX - ONT
1 stop4h 57mAlaska Airlines
Deal found 31/10$307
Fri 5/1207:10ONT - PDX
Nonstop2h 31mAlaska Airlines
Thu 11/1217:45PDX - ONT
Nonstop2h 18mAlaska Airlines
Deal found 31/10$309
Sat 24/105:30ONT - PDX
1 stop6h 10mSouthwest
Mon 26/114:25PDX - ONT
2 stops6h 40mSouthwest
Deal found 31/10$318
Tue 3/306:00ONT - PDX
1 stop6h 36mAlaska Airlines
Thu 5/310:30PDX - ONT
1 stop7h 12mAlaska Airlines
Deal found 30/10$325
Tue 16/1206:00ONT - PDX
1 stop7h 50mAlaska Airlines
Tue 30/1214:55PDX - ONT
Nonstop2h 16mAlaska Airlines
Deal found 1/11$326
Thu 1/107:00ONT - PDX
Nonstop2h 29mAlaska Airlines
Sun 4/109:49PDX - ONT
Nonstop2h 19mAlaska Airlines
Deal found 31/10$344
Sat 13/1206:00ONT - PDX
1 stop7h 50mAlaska Airlines
Wed 17/1217:45PDX - ONT
Nonstop2h 18mAlaska Airlines
Deal found 31/10$351
Sat 6/1207:10ONT - BZN
1 stop4h 54mAlaska Airlines
Sat 6/1215:58BZN - ONT
1 stop5h 05mAlaska Airlines
Deal found 31/10$393

Find flights from Ontario within your budget

 
Find flights departing from Ontario that match your specified budget. Filter results by price range, allowing you to narrow down options and find flights that fit within your financial constraints. Please note that the search results are based on data from user searches, with fares last updated on 2 November 2025. In the last 7 days, Cheapflights users made a total of 134,765 searches

Fly to

Auckland

Route

Departure

Return

Price

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Sat 6/12

07:10-09:41

Nonstop2h 31m

Portland

Tue 9/12

10:30-12:46

Nonstop2h 16m

$274

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Wed 24/12

18:05-20:30

Nonstop2h 25m

Portland

Fri 2/1

21:38-23:59

Nonstop2h 21m

$292

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Tue 16/12

07:10-09:41

Nonstop2h 31m

Portland

Sun 4/1

21:38-23:59

Nonstop2h 21m

$292

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Tue 3/3

06:00-12:36

1 stop6h 36m

Portland

Thu 5/3

10:30-17:42

1 stop7h 12m

$325

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Thu 20/11

17:49-00:14

1 stop6h 25m

Portland

Mon 24/11

19:22-23:52

1 stop4h 30m

$326

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Wed 11/3

07:00-09:24

Nonstop2h 24m

Portland

Sat 14/3

14:35-16:53

Nonstop2h 18m

$344

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Fri 27/2

18:55-00:03

1 stop5h 08m

Portland

Thu 5/3

10:30-17:42

1 stop7h 12m

$344

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Sat 13/12

06:00-13:50

1 stop7h 50m

Portland

Wed 17/12

17:45-20:03

Nonstop2h 18m

$351

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Fri 6/2

07:00-09:33

Nonstop2h 33m

Portland

Mon 9/2

14:41-19:16

1 stop4h 35m

$361

OntarioBozeman

ONT - BZN

ONTBZN

Ontario

Sat 6/12

07:10-13:04

1 stop4h 54m

Bozeman Gallatin Field

Sat 6/12

15:58-20:03

1 stop5h 05m

$393

Flights are sorted by cheapest return flights first.

Deals found on 1/11

Showing 1-10 of 60 results
1
2
3
...
6

Best time to book a flight from Ontario

Have a flexible travel schedule? Discover the best time to fly from 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.

Travel insights for flights from Ontario

Get recent, data-driven insights about flights from Ontario including ideal travel times, pricing trends, and more.

What is the cheapest month to book a flight from Ontario?

Currently, April is the cheapest month in which you can book a flight from Ontario (average of $574). Flying from Ontario in August will prove the most costly (average of $1,238). There are multiple factors that influence the price of a flight so comparing airlines, departure airports and times can help keep costs down.

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Direct flights from California

Book a direct flight from one of these other cities located in California.
Direct flights from Los Angeles
Direct flights from San Francisco
Direct flights from San Diego
Direct flights from San Jose
Direct flights from Palm Springs

Related info for your journey

Access useful and relevant information related to your journey from Ontario. This can include details such as airport transportation, visa requirements, travel insurance, luggage regulations, and any other information that can ensure a smooth and hassle-free travel experience. Please note that the information is based on general guidance and may need to be verified with official sources. Data last updated 2 November 2025.

  • What are the most popular destinations to fly to from Ontario?

    The most popular destinations from Ontario this month are Dallas/Fort Worth Airport, Denver, Guadalajara. The top year-round destinations include Dallas/Fort Worth Airport, Denver, Guadalajara.

  • What is the cheapest first class flight from Ontario?

    If you’re looking for a cheap first-class flight from Ontario, consider Seattle. Prices start at $2,782 so you can fly first-class even on a budget.

  • What is the cheapest month to fly from Ontario?

    At the present moment the cheapest month to fly from Ontario is currently April; with August being the most expensive. Prices will vary depending on multiple factors such as booking in advance, airline and departure airports and times.

  • Where are the cheapest places to fly to from Ontario?

    Here are some of the cheapest flight destinations from Ontario:
    Fly from Ontario to Auckland from $1,678 round trip

  • How does Cheapflights help users find flights from Ontario?

    When you search for this flight from Ontario, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the best flight for you.

  • Why should you use Cheapflights to find cheap flight tickets from Ontario?

    Millions of users choose and trust Cheapflights to book the best flight deals from Ontario for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

  • Can Cheapflights find flights from Ontario with no change fees?

    Cheapflights does show flights with no change fees to all users. To see these options for flights from Ontario, users can toggle the no change fees filter when performing a flight search.

  • Can Cheapflights notify me if prices for flights from Ontario become cheaper?

    Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and use a valid email address to enable the Price Alerts feature. That’s it!

See more FAQs

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Ontario?

When you search for this flight from Ontario, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the best flight for you.

Why should you use Cheapflights to find cheap flight tickets from Ontario?

Millions of users choose and trust Cheapflights to book the best flight deals from Ontario for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from Ontario with no change fees?

Cheapflights does show flights with no change fees to all users. To see these options for flights from Ontario, users can toggle the no change fees filter when performing a flight search.

Can Cheapflights notify me if prices for flights from Ontario become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and use a valid email address to enable the Price Alerts feature. That’s it!

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.