HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$128+ Cheap flights from Monterey to Ontario (MRY - ONT)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/30. Fares are subject to change and may not be available on all flights or dates of travel.
MRY — ONT
Jan 14 — Jan 211
Wed 1/14
Wed 1/21
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Monterey to Ontario with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Monterey to Ontario

Cheapest flights from Monterey to Ontario
Explore the most affordable flight options available from Monterey to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 15, 2025.

This United Airlines deal was found by Cheapflights users on 12/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/182:30 pmMRY - ONT
1 stop3h 13mUnited Airlines
Sun 12/216:00 amONT - MRY
1 stop4h 29mUnited Airlines
Deal found 12/14$339
This Kiwi.com deal was found by Cheapflights users on 12/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/299:52 pmMRY - ONT
1 stop19h 30mMultiple Airlines
Fri 1/26:00 amONT - MRY
1 stop15h 24mMultiple Airlines
Deal found 12/14$406
This United Airlines deal was found by Cheapflights users on 12/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/272:30 pmMRY - ONT
1 stop3h 13mUnited Airlines
Sat 1/101:24 pmONT - MRY
1 stop7h 56mUnited Airlines
Deal found 12/14$464
This United Airlines deal was found by Cheapflights users on 12/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/272:30 pmMRY - ONT
1 stop3h 13mUnited Airlines
Sun 12/286:00 amONT - MRY
1 stop4h 29mUnited Airlines
Deal found 12/14$490
This United Airlines deal was found by Cheapflights users on 12/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/142:33 pmMRY - ONT
1 stop3h 04mUnited Airlines
Fri 1/96:39 pmONT - MRY
1 stop3h 20mUnited Airlines
Deal found 12/14$524
This United Airlines deal was found by Cheapflights users on 12/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/1312:40 pmMRY - ONT
1 stop8h 02mUnited Airlines
Sun 12/146:41 pmONT - MRY
1 stop3h 18mUnited Airlines
Deal found 12/13$549
This United Airlines deal was found by Cheapflights users on 12/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/282:30 pmMRY - ONT
1 stop3h 13mUnited Airlines
Mon 12/296:00 amONT - MRY
1 stop4h 29mUnited Airlines
Deal found 12/13$584
This United Airlines deal was found by Cheapflights users on 12/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/202:30 pmMRY - ONT
1 stop8h 11mUnited Airlines
Sun 12/215:05 amONT - MRY
1 stop8h 40mUnited Airlines
Deal found 12/13$590
This United Airlines deal was found by Cheapflights users on 12/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/242:30 pmMRY - ONT
1 stop3h 40mUnited Airlines
Mon 12/296:00 amONT - MRY
1 stop4h 29mUnited Airlines
Deal found 12/14$624
This American Airlines deal was found by Cheapflights users on 12/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/234:24 pmMRY - ONT
1 stop19h 29mAmerican Airlines
Thu 12/259:53 amONT - MRY
1 stop23h 36mAmerican Airlines
Deal found 12/13$642
This United Airlines deal was found by Cheapflights users on 12/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/152:33 pmMRY - ONT
1 stop3h 04mUnited Airlines
Fri 12/196:39 pmONT - MRY
1 stop15h 50mUnited Airlines
Deal found 12/13$646

Find flight deals from Monterey to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Monterey (MRY) to Ontario (ONT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated December 15, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$279
(Alaska Airlines)

One-way from

$128
(Alaska Airlines)

Popular in

November

Cheapest in

January

Average price

$200
Provider with most accurate pricing for Monterey Regional-Ontario flight deals.
Search Deals
Provider most trusted by Cheapflights users for Monterey Regional-Ontario flights.
Search Deals
From Monterey Regional to Ontario
Search Deals
One-way flight from Monterey Regional to Ontario
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($22 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Monterey to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated December 15, 2025.
Use the filters below to find and compare flights from Monterey to Ontario that are best for you.

Fly from

Monterey

Fly to

Ontario

Route

Depart

Return

Price

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

Thu 2/26

6:40 am-12:38 pm

1 stop5h 58m

Ontario

Sun 3/1

1:50 pm-5:20 pm

1 stop3h 30m

$290

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

Thu 2/26

5:00 am-12:43 pm

1 stop7h 43m

Ontario

Mon 3/2

6:37 pm-10:28 pm

1 stop3h 51m

$299

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

Thu 1/22

12:35 pm-8:58 pm

1 stop8h 23m

Ontario

Sat 1/24

6:32 pm-9:59 pm

1 stop3h 27m

$299

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

Fri 2/20

6:03 pm-10:57 pm

1 stop4h 54m

Ontario

Mon 2/23

6:37 pm-10:28 pm

1 stop3h 51m

$299

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

Thu 1/8

5:00 am-12:47 pm

1 stop7h 47m

Ontario

Sun 1/11

1:53 pm-7:19 pm

1 stop5h 26m

$299

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

Wed 2/25

6:40 am-12:48 pm

1 stop6h 08m

Ontario

Mon 3/2

1:50 pm-5:20 pm

1 stop3h 30m

$299

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

Thu 1/1

2:30 pm-5:43 pm

1 stop3h 13m

Ontario

Mon 1/5

6:39 pm-9:59 pm

1 stop3h 20m

$304

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

Wed 2/25

6:00 am-10:44 pm

2 stops16h 44m

Ontario

Mon 3/2

6:14 am-6:36 pm

1 stop12h 22m

$314

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

Thu 2/26

6:56 pm-3:08 pm

1 stop20h 12m

Ontario

Sun 3/1

6:14 am-6:36 pm

1 stop12h 22m

$338

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

Sat 1/24

5:00 am-12:47 pm

1 stop7h 47m

Ontario

Tue 1/27

1:24 pm-9:20 pm

1 stop7h 56m

$339

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/14

Showing 1-10 of 22 results
1
2
3

Compare providers for flights from Monterey to Ontario

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Monterey to Ontario in December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Monterey-Ontario flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Monterey-Ontario flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Monterey-Ontario flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Monterey-Ontario flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Monterey-Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Monterey to Ontario

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

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

Currently, February is the cheapest month in which you can book a flight from Monterey to Ontario (average of $19). Flying from Monterey to Ontario in September is currently the most expensive (average of $60). 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.

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ontario. Reviews last updated December 15, 2025.
Peruse reviews from past customers who have flown with United Airlines from Monterey to Ontario to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,092 reviews

Crew

8.1

Food

6.6

Boarding

7.7

Comfort

7.3

Overall

7.4

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Simon,Jun 2024

LAS - LAX

Basic and no-frills. Late timing put pressure on disembarking and making connections.
United Airlines
7.4
Good
9,092 reviews
United Airlines
7.4
Good
9,092 reviews

Crew

8.1

Food

6.6

Boarding

7.7

Comfort

7.3

Overall

7.4

Entertainment

7.1

Reviews

1 / 20
4.0
Okay

Simon,Jun 2024

LAS - LAX

Basic and no-frills. Late timing put pressure on disembarking and making connections.

Related info for your journey

Find useful and relevant information for your journey from Monterey to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Monterey to Ontario?

    Departing from Monterey to Ontario will take you 5h 58m. Monterey and Ontario are separated by a distance of 296 mi.

  • What is the cheapest airline to fly from Monterey to Ontario round-trip?

    United Airlines, at $218, was found to be the cheapest airline from Monterey to Ontario..

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

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

  • How can I find direct flights from Monterey to Ontario?

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

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

    Yes. Cheapflights offers flight deals from Monterey 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 Monterey to Ontario?

    Currently, February is the cheapest month in which you can book a flight from Monterey to Ontario (average of $19). Flying from Monterey to Ontario in September is currently the most expensive (average of $60). 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

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

Alternative routes for Monterey to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
San Francisco to Las Vegas flights
Los Angeles to Las Vegas flights
Ontario to San Francisco flights
San Francisco to Ontario flights
San Francisco to Los Angeles flights
Burbank to Las Vegas flights
Los Angeles to San Francisco flights
Santa Ana to Las Vegas flights
San Jose to Los Angeles flights
San Francisco to Santa Ana flights
Oakland to Las Vegas flights
San Jose to Las Vegas flights
Los Angeles to San Jose flights
San Francisco to San Diego flights
Santa Ana to San Francisco flights
Sacramento to Las Vegas flights
San Diego to Las Vegas flights
Ontario to Las Vegas flights
San Diego to San Francisco flights
Sacramento to Los Angeles flights
Los Angeles to Sacramento flights
San Francisco to Palm Springs flights
Burbank to San Francisco flights
Las Vegas to Los Angeles flights
Los Angeles to Reno flights
San Jose to San Diego flights
Oakland to Los Angeles flights
San Francisco to Burbank flights
Sacramento to Ontario flights
San Jose to Santa Ana flights
San Jose to Ontario flights
Ontario to Sacramento flights
Oakland to San Diego flights
Ontario to San Jose flights
Stockton to Las Vegas flights
Las Vegas to San Francisco flights
Las Vegas to Santa Ana flights
Sacramento to Santa Ana flights
Santa Rosa to Las Vegas flights
Las Vegas to Burbank flights
Fresno to Las Vegas flights
Santa Ana to San Jose flights
Santa Rosa to Los Angeles flights
Long Beach to San Francisco flights
Las Vegas to Ontario flights
Reno to Las Vegas flights
Long Beach to Las Vegas flights
San Diego to Sacramento flights
Las Vegas to San Jose flights
San Diego to San Jose flights

Top airline flying from Monterey to Ontario

Discover the top airline that operate flights from Monterey to Ontario. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated December 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$218Average$297FlexibilityNo cancel feeOn-time69%

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.