How long is the flight from California to Region of Ontario?

A quick flight from California to Region of Ontario can take about 10h 11m. WestJet provides one of the quickest options available for as low as C$ 571. Airlines will cover a distance of 3492 km. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

What are the cheapest airlines to fly from California to Region of Ontario one-way?

C$ 74 is the cheapest one-way deal found within the past few days, from WestJet. You may also be able to find cheap deals on Porter Airlines and Delta, with prices starting from C$ 101 and C$ 121, respectively.

In terms of precipitation, rainfall in Region of Ontario ranges from 51.0 - 83.0 mm per month. June is typically the wettest month, when rainfall can reach 83.0 mm. February is typically the driest time to visit Region of Ontario when rainfall is around 51.0 mm.

If weather is an important factor for your trip to Region of Ontario, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 21.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around -6.0 C).

Can I find deals for flights from California to Ontario that include hotel bookings?

Yes. In addition to deals on California to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from California to Ontario?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from California to Ontario.

Can I find deals for business class flights from California to Ontario?

Yes. Cheapflights offers flight deals from California to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

C$ 205+ Cheap Flights from California to Ontario

Cheap flight deals from California to Ontario

Enter your travel dates to find the best prices.

Cheapest

Best

Direct

Last-minute

One-way

Cheapest flights from California to Ontario
Explore the most affordable flight options available from California to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 8 September 2026.

Thu 24/94:30 p.m. -

Nonstop4h 43m

Fri 2/1011:05 a.m. -

Nonstop5h 15m

Deal found 3/9C$ 426

Sat 17/102:15 p.m. -

Nonstop4h 44m

Fri 23/1011:05 a.m. -

Nonstop5h 15m

Deal found 4/9C$ 428

Wed 21/102:15 p.m. -

Nonstop4h 44m

Sun 25/109:55 a.m. -

Nonstop5h 39m

Deal found 5/9C$ 430

Fri 2/104:55 p.m. -

1 stop9h 15m

Sat 3/109:00 a.m. -

1 stop11h 10m

Deal found 4/9C$ 433

Sat 17/107:30 a.m. -

1 stop8h 25m

Fri 23/1010:50 a.m. -

1 stop9h 20m

Deal found 4/9C$ 434

Fri 9/101:15 p.m. -

1 stop8h 50m

Sun 11/102:50 p.m. -

1 stop10h 15m

Deal found 4/9C$ 437

Fri 2/104:55 p.m. -

1 stop9h 15m

Mon 5/102:50 p.m. -

1 stop10h 15m

Deal found 4/9C$ 438

Sat 17/102:15 p.m. -

Nonstop4h 44m

Thu 22/103:50 p.m. -

1 stop9h 15m

Deal found 4/9C$ 440

Tue 29/92:15 p.m. -

Nonstop4h 45m

Thu 1/103:50 p.m. -

1 stop9h 15m

Deal found 3/9C$ 441

Fri 2/1012:10 p.m. -

1 stop9h 55m

Wed 7/101:30 p.m. -

1 stop11h 35m

Deal found 3/9C$ 442

Tue 20/101:15 p.m. -

2 stops12h 55m

Mon 26/109:55 a.m. -

Nonstop5h 39m

Deal found 4/9C$ 444

Sun 18/107:30 a.m. -

1 stop8h 25m

Mon 26/109:35 a.m. -

1 stop10h 35m

Deal found 4/9C$ 445

Best flights from California to Ontario
Discover carefully curated flight deals from California to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 8 September 2026.

Thu 15/106:00 a.m. -

1 stop8h 15m

Sun 18/106:10 p.m. -

1 stop20h 50m

Deal found 6/9C$ 527

Tue 1/1212:25 a.m. -

1 stop10h 38m

Wed 2/125:10 p.m. -

1 stop8h 49m

Deal found 6/9C$ 551

Thu 12/119:46 a.m. -

1 stop10h 11m

Sun 15/112:20 p.m. -

1 stop11h 14m

Deal found 3/9C$ 571

Tue 20/106:45 a.m. -

2 stops12h 40m

Sat 24/106:05 a.m. -

3 stops19h 00m

Deal found 4/9C$ 576

Mon 26/105:45 p.m. -

1 stop19h 20m

Mon 9/115:15 p.m. -

2 stops18h 45m

Deal found 5/9C$ 634

Tue 9/21:45 p.m. -

Nonstop4h 54m

Sun 14/29:50 a.m. -

Nonstop5h 55m

Deal found 7/9C$ 697

Thu 5/1112:55 p.m. -

Nonstop5h 00m

Sun 8/119:20 a.m. -

Nonstop5h 40m

Deal found 3/9C$ 850

Tue 13/106:00 a.m. -

1 stop8h 15m

Mon 19/106:10 p.m. -

1 stop20h 50m

Deal found 6/9C$ 527

Tue 29/91:15 p.m. -

1 stop6h 58m

Thu 8/102:26 p.m. -

1 stop11h 08m

Deal found 3/9C$ 571

Sun 4/106:00 a.m. -

1 stop8h 15m

Wed 14/106:05 a.m. -

3 stops13h 35m

Deal found 6/9C$ 582

Sun 27/96:00 a.m. -

1 stop8h 15m

Tue 29/96:10 p.m. -

1 stop25h 30m

Deal found 3/9C$ 532

Wed 18/116:59 p.m. -

2 stops18h 06m

Sun 22/115:15 p.m. -

2 stops18h 46m

Deal found 6/9C$ 641

Thu 1/106:05 p.m. -

2 stops20h 55m

Sun 4/107:25 a.m. -

2 stops17h 40m

Deal found 6/9C$ 616

Thu 8/106:05 p.m. -

1 stop20h 10m

Mon 12/106:10 p.m. -

1 stop21h 15m

Deal found 4/9C$ 561

Mon 21/910:59 p.m. -

1 stop6h 54m

Fri 25/97:24 p.m. -

1 stop7h 29m

Deal found 3/9C$ 619

Wed 14/1012:45 a.m. -

1 stop10h 39m

Thu 15/105:16 p.m. -

Nonstop5h 36m

Deal found 5/9C$ 723

Sat 10/103:37 p.m. -

2 stops21h 08m

Sat 31/105:15 p.m. -

2 stops20h 40m

Deal found 3/9C$ 677

Sun 27/96:00 a.m. -

2 stops13h 09m

Tue 29/96:05 a.m. -

3 stops32h 55m

Deal found 3/9C$ 616

Tue 13/106:00 a.m. -

1 stop8h 15m

Sun 18/106:10 p.m. -

1 stop20h 50m

Deal found 4/9C$ 567

Fri 30/101:35 p.m. -

1 stop8h 00m

Sat 31/106:45 a.m. -

1 stop8h 49m

Deal found 7/9C$ 784

Wed 10/28:11 a.m. -

Nonstop5h 00m

Sun 14/26:30 a.m. -

Nonstop6h 09m

Deal found 7/9C$ 744

Wed 21/106:05 p.m. -

3 stops25h 20m

Wed 28/106:05 a.m. -

2 stops19h 26m

Deal found 6/9C$ 623

Thu 22/1012:15 p.m. -

1 stop8h 44m

Mon 2/116:33 p.m. -

1 stop9h 10m

Deal found 7/9C$ 687

Sat 26/96:05 p.m. -

1 stop20h 10m

Thu 1/106:10 p.m. -

1 stop30h 55m

Deal found 3/9C$ 603

Tue 13/1012:57 p.m. -

2 stops23h 48m

Wed 21/104:55 p.m. -

2 stops19h 03m

Deal found 6/9C$ 738

Tue 13/108:10 a.m. -

Nonstop5h 04m

Sun 18/106:30 a.m. -

Nonstop5h 38m

Deal found 7/9C$ 744

Wed 30/96:00 a.m. -

2 stops10h 29m

Fri 2/107:00 a.m. -

2 stops17h 55m

Deal found 7/9C$ 644

Wed 30/96:05 p.m. -

1 stop20h 10m

Tue 6/106:10 p.m. -

1 stop20h 50m

Deal found 4/9C$ 611

Fri 25/911:30 p.m. -

1 stop11h 49m

Tue 29/97:00 a.m. -

1 stop7h 23m

Deal found 7/9C$ 752

Sat 17/101:20 p.m. -

1 stop8h 17m

Sun 25/109:45 a.m. -

2 stops33h 37m

Deal found 4/9C$ 915

Find flight deals from California to Ontario

Round-trip from	C$ 409
One-way from	C$ 205
Popular in	July
Cheapest in	January
Average price	C$ 610
Good round-trip deal	C$ 522 or less
Good one-way deal	C$ 212 or less

Porter Airlines
28/10-31/10
Nonstop
10h 22m total
California to Ontario

Search Deals

WestJet
16/9-31/12
1 total stop
8h 15m total
California to Ontario

Search Deals

Highest demand for flights based on searches. 17% potential increase in price (C$ 185 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease (C$ 24 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in September 2026

Search Deals

Price to beat on a round-trip flight from California to Ontario.

Search Deals

Price to beat on a one-way flight from California to Ontario.

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

San FranciscoHamilton

SFO San Francisco - YHM Hamilton

SFOYHM

San Francisco

Sun 18/10

6:00 a.m.-5:15 p.m.

1 stop8h 15m

Hamilton

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 220

San FranciscoHamilton

SFO San Francisco - YHM Hamilton

SFOYHM

San Francisco

Fri 9/10

6:00 a.m.-5:15 p.m.

1 stop8h 15m

Hamilton

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 227

San FranciscoHamilton

SFO San Francisco - YHM Hamilton

SFOYHM

San Francisco

Mon 21/9

6:00 a.m.-5:15 p.m.

1 stop8h 15m

Hamilton

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 239

Los AngelesHamilton

LAX Los Angeles - YHM Hamilton

LAXYHM

Los Angeles

Sat 24/10

12:10 p.m.-3:25 p.m.

2 stops24h 15m

Hamilton

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 246

San FranciscoToronto

SFO San Francisco - YYZ Toronto Pearson Intl

SFOYYZ

San Francisco

Wed 28/10

4:51 p.m.-4:05 p.m.

2 stops20h 14m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 253

San FranciscoHamilton

SFO San Francisco - YHM Hamilton

SFOYHM

San Francisco

Tue 13/10

6:00 a.m.-5:15 p.m.

1 stop8h 15m

Hamilton

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 253

San FranciscoHamilton

SFO San Francisco - YHM Hamilton

SFOYHM

San Francisco

Tue 15/9

1:00 p.m.-5:15 p.m.

1 stop25h 15m

Hamilton

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 257

San FranciscoToronto

SFO San Francisco - YYZ Toronto Pearson Intl

SFOYYZ

San Francisco

Thu 8/10

6:05 a.m.-6:29 p.m.

1 stop9h 24m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 260

Los AngelesToronto

LAX Los Angeles - YYZ Toronto Pearson Intl

LAXYYZ

Los Angeles

Tue 15/12

10:45 a.m.-11:59 p.m.

2 stops10h 14m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 260

Los AngelesToronto

LAX Los Angeles - YYZ Toronto Pearson Intl

LAXYYZ

Los Angeles

Thu 8/10

10:05 p.m.-11:19 a.m.

1 stop10h 14m

Toronto Pearson Intl

Wed 31/12

12:00 a.m.-9:00 p.m.

Nonstop0h 00m

C$ 260

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/9

Showing 1-10 of 60 resultsSorted by cheapest first

...

Best time to book a flight from California to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from California with our price prediction graph.

SFO-YHM

LAX-YHM

SFO-YYZ

SAN-YYZ

LAX-YYZ

Estimated round-trip 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.

Cheapflights Insights

Everything you need to know about your flight from California to Ontario

USCA-CAON

SFO-YHM

LAX-YHM

SFO-YYZ

SAN-YYZ

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

Currently, February is the cheapest month in which you can book a flight from California to Region of Ontario (average of C$ 546). Flying from California to Region of Ontario in December is currently the most expensive (average of C$ 804). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from CA to ON?

Unlike in the evening, when flights are generally more expensive, you can save up to 10% on flights from California to Region of Ontario by exploring options for tickets at noon.

Weekly flight availability from California to Region of Ontario

The most flights from USCA to CAON are scheduled on a Monday (23 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (7 on average).

How much does it cost to fly round-trip from California to Region of Ontario?

Airfare is typical for this route at the moment.

California to Region of Ontario flights typically cost between C$ 408 and C$ 782 in October.
The cheapest round-trip price found within the last 5 days was C$ 409 on Porter Airlines (28 Oct-31 Oct).

How far ahead should I book a flight from California to Region of Ontario?

The best time to book flights from California to Region of Ontario is 89 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest day to fly from California to Region of Ontario?

Travelers seeking maximum savings on their California to Region of Ontario flight should consider departing on Sunday mornings when fares are most often at their lowest. Thursday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Ontario

See what other customers who have flown with Porter Airlines,Delta, andUnited Airlines from California to Ontario have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Porter Airlines

8.0

Very good

458 reviews

Check prices

Reviews

1 / 20

6.0

Good

Shannon,Jul 2026

YQT - YOW

Seats need to be a bit bigger & I'm not impressed that you have to pay to change seats

Porter Airlines

8.0

Very good

458 reviews

Porter Airlines

8.0

Very good

458 reviews

Check prices

Reviews

1 / 20

6.0

Good

Shannon,Jul 2026

YQT - YOW

Seats need to be a bit bigger & I'm not impressed that you have to pay to change seats

Delta

7.8

Good

8,548 reviews

Porter Airlines

8.0

Very good

458 reviews

Check prices

Reviews

1 / 20

6.0

Good

Shannon,Jul 2026

YQT - YOW

Seats need to be a bit bigger & I'm not impressed that you have to pay to change seats

United Airlines

7.4

Good

10,180 reviews

Porter Airlines

8.0

Very good

458 reviews

Check prices

Reviews

1 / 20

6.0

Good

Shannon,Jul 2026

YQT - YOW

Seats need to be a bit bigger & I'm not impressed that you have to pay to change seats

WestJet

7.2

Good

3,447 reviews

Porter Airlines

8.0

Very good

458 reviews

Check prices

Reviews

1 / 20

6.0

Good

Shannon,Jul 2026

YQT - YOW

Seats need to be a bit bigger & I'm not impressed that you have to pay to change seats

Air Canada

7.1

Good

11,600 reviews

Porter Airlines

8.0

Very good

458 reviews

Check prices

Reviews

1 / 20

6.0

Good

Shannon,Jul 2026

YQT - YOW

Seats need to be a bit bigger & I'm not impressed that you have to pay to change seats

Related info for your journey

How long is the flight from California to Region of Ontario?
A quick flight from California to Region of Ontario can take about 10h 11m. WestJet provides one of the quickest options available for as low as C$ 571. Airlines will cover a distance of 3492 km. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.
What are the cheapest airlines to fly from California to Region of Ontario one-way?
C$ 74 is the cheapest one-way deal found within the past few days, from WestJet. You may also be able to find cheap deals on Porter Airlines and Delta, with prices starting from C$ 101 and C$ 121, respectively.
Can I find deals for flights from California to Ontario that include hotel bookings?
Yes. In addition to deals on California to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from California to Ontario?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from California to Ontario.
Can I find deals for business class flights from California to Ontario?
Yes. Cheapflights offers flight deals from California to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from California to Region of Ontario?
Currently, February is the cheapest month in which you can book a flight from California to Region of Ontario (average of C$ 546). Flying from California to Region of Ontario in December is currently the most expensive (average of C$ 804). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Alternative routes

Complete your trip

Direct flights to Canada

Flights by cabin class

Other flight options

Popular flights

Return Flight Options

Top destinations

Alternative routes for California to Ontario

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Top 7 airlines flying from California to Ontario

Airline	Cheapest	Average	Flexibility	On-time
WestJet	CheapestC$ 220	AverageC$ 601	FlexibilityNo cancel fee	On-time60%	Search WestJet flights
American Airlines	CheapestC$ 260	AverageC$ 857	FlexibilityNo cancel fee	On-time71%	Search American Airlines flights
Air Transat	CheapestC$ 277	AverageC$ 829	FlexibilityNo cancel fee	On-time50%	Search Air Transat flights
Air Canada	CheapestC$ 293	AverageC$ 773	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights
Porter Airlines	CheapestC$ 298	AverageC$ 628	FlexibilityNo cancel fee	On-time52%	Search Porter Airlines flights
Delta	CheapestC$ 330	AverageC$ 863	FlexibilityNo cancel fee	On-timeN/A	Search Delta flights
United Airlines	CheapestC$ 445	AverageC$ 1,052	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights

Fly with Cheapflights

How does Cheapflights help users find flights from California to Ontario?

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Ontario from California today with Cheapflights!

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

Cheapflights helps you find that perfect flight to Ontario from California by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from California to Ontario with no change fees?

Certainly. Search results for flights to Ontario from California shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

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

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Ontario from California today and book when prices fit your budget.

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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.

Cheap flights from California to Ontario from C$ 205

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 16/9. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from California to Ontario

Cheapest flights from California to OntarioExplore the most affordable flight options available from California to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 8 September 2026.

Explore the most affordable flight options available from California to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 8 September 2026.

Best flights from California to OntarioDiscover carefully curated flight deals from California to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 8 September 2026.

Discover carefully curated flight deals from California to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 8 September 2026.

Direct flights from California to OntarioExplore direct flight options from California to Ontario based on user searches, and compare prices and availability for your desired travel dates. Data last updated 8 September 2026.

Explore direct flight options from California to Ontario based on user searches, and compare prices and availability for your desired travel dates. Data last updated 8 September 2026.

Last-minute flights from California to OntarioDiscover last-minute flight deals from California to Ontario. Data last updated 8 September 2026 and is based on user searches.

Discover last-minute flight deals from California to Ontario. Data last updated 8 September 2026 and is based on user searches.

One-way flights from California to OntarioSearch for one-way flight options from California to Ontario. Find affordable one-way fares based on user searches. Data last updated 8 September 2026.

Search for one-way flight options from California to Ontario. Find affordable one-way fares based on user searches. Data last updated 8 September 2026.

Find flight deals from California to Ontario

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Cheapflights Fare Finder

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

Best time to book a flight from California to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from California with our price prediction graph.

Cheapflights Insights

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

What is the cheapest time of day to fly from CA to ON?

Find hourly flight availability from California to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 8 September 2026.

Unlike in the evening, when flights are generally more expensive, you can save up to 10% on flights from California to Region of Ontario by exploring options for tickets at noon.

Weekly flight availability from California to Region of Ontario

Explore weekly flight availability from California to Ontario. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 8 September 2026.

The most flights from USCA to CAON are scheduled on a Monday (23 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (7 on average).

How much does it cost to fly round-trip from California to Region of Ontario?

Airfare is typical for this route at the moment.

California to Region of Ontario flights typically cost between C$ 408 and C$ 782 in October.The cheapest round-trip price found within the last 5 days was C$ 409 on Porter Airlines (28 Oct-31 Oct).

How far ahead should I book a flight from California to Region of Ontario?

The best time to book flights from California to Region of Ontario is 89 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest day to fly from California to Region of Ontario?

Use this chart to determine the cheapest time to fly round-trip from California to Ontario. Price data was last updated on 5 September 2026.

Travelers seeking maximum savings on their California to Region of Ontario flight should consider departing on Sunday mornings when fares are most often at their lowest. Thursday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Ontario

See what other customers who have flown with Porter Airlines,Delta, andUnited Airlines from California to Ontario have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

How long is the flight from California to Region of Ontario?

What are the cheapest airlines to fly from California to Region of Ontario one-way?

Can I find deals for flights from California to Ontario that include hotel bookings?

How can I find direct flights from California to Ontario?

Can I find deals for business class flights from California to Ontario?

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

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Alternative routes for California to Ontario

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California and Ontario flights

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California to Ontario flights

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Top 7 airlines flying from California to Ontario

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Cheapest flights from California to Ontario
Explore the most affordable flight options available from California to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 8 September 2026.

Best flights from California to Ontario
Discover carefully curated flight deals from California to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 8 September 2026.

Direct flights from California to Ontario
Explore direct flight options from California to Ontario based on user searches, and compare prices and availability for your desired travel dates. Data last updated 8 September 2026.

Last-minute flights from California to Ontario
Discover last-minute flight deals from California to Ontario. Data last updated 8 September 2026 and is based on user searches.

One-way flights from California to Ontario
Search for one-way flight options from California to Ontario. Find affordable one-way fares based on user searches. Data last updated 8 September 2026.

California to Region of Ontario flights typically cost between C$ 408 and C$ 782 in October.
The cheapest round-trip price found within the last 5 days was C$ 409 on Porter Airlines (28 Oct-31 Oct).