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$229+ Cheap flights from Monterey to Ontario (MRY - ONT)

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 11/11. Fares are subject to change and may not be available on all flights or dates of travel.
MRY — ONT
nov. 27 — déc. 41
jeu. 11/27
jeu. 12/4
1 adult, Economy
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Cheap 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 octobre 28, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$229
(United Airlines)

Popular in

April

Cheapest in

January

Average price

$155
Provider with most accurate pricing for Monterey Regional-Ontario flight deals.
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Provider most trusted by Cheapflights users for Monterey Regional-Ontario flights.
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From Monterey Regional to Ontario
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Highest demand for flights based on searches. 6% potential increase in price ($11 potential increase over avg. RT price).
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Cheapest flight prices on average. 0% potential price decrease ($2 potential savings vs. average RT price).
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Average for round-trip flights in October 2025
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Find 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 octobre 28, 2025.

This United Airlines deal was found by Cheapflights users on 10/27. 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.
mar. 11/112:30 pmMRY - ONT
1 stop3h 04mUnited Airlines
sam. 11/156:00 amONT - MRY
1 stop4h 33mUnited Airlines
Deal found 10/27$229
This United Airlines deal was found by Cheapflights users on 10/28. 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.
mer. 11/127:50 amMRY - ONT
1 stop4h 47mUnited Airlines
dim. 11/166:00 amONT - MRY
1 stop4h 33mUnited Airlines
Deal found 10/28$249
This United Airlines deal was found by Cheapflights users on 10/28. 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.
sam. 12/62:33 pmMRY - ONT
1 stop3h 04mUnited Airlines
mar. 12/96:00 amONT - MRY
1 stop4h 33mUnited Airlines
Deal found 10/28$279
This United Airlines deal was found by Cheapflights users on 10/28. 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.
jeu. 11/207:50 amMRY - ONT
1 stop4h 47mUnited Airlines
dim. 11/236:38 pmONT - MRY
1 stop3h 20mUnited Airlines
Deal found 10/28$280
This Kiwi.com deal was found by Cheapflights users on 10/25. 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.
lun. 11/103:50 pmMRY - ONT
1 stop6h 07mMultiple Airlines
ven. 11/146:00 amONT - MRY
1 stop9h 00mMultiple Airlines
Deal found 10/25$297
This United Airlines deal was found by Cheapflights users on 10/26. 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.
sam. 11/85:00 amMRY - ONT
1 stop7h 30mUnited Airlines
mer. 11/126:00 amONT - MRY
1 stop4h 33mUnited Airlines
Deal found 10/26$299
This United Airlines deal was found by Cheapflights users on 10/28. 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.
ven. 11/217:50 amMRY - ONT
1 stop4h 47mUnited Airlines
sam. 11/226:38 pmONT - MRY
1 stop3h 20mUnited Airlines
Deal found 10/28$319
This Alaska Airlines deal was found by Cheapflights users on 10/28. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ven. 12/1211:23 amMRY - ONT
1 stop12h 06mAlaska Airlines
lun. 12/157:33 pmONT - MRY
1 stop15h 13mAlaska Airlines
Deal found 10/28$322
This United Airlines deal was found by Cheapflights users on 10/26. 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.
lun. 11/102:30 pmMRY - ONT
1 stop3h 04mUnited Airlines
lun. 11/176:00 amONT - MRY
1 stop4h 33mUnited Airlines
Deal found 10/26$324
This United Airlines deal was found by Cheapflights users on 10/28. 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.
sam. 11/112:35 pmMRY - ONT
1 stop8h 09mUnited Airlines
lun. 11/31:29 pmONT - MRY
1 stop7h 38mUnited Airlines
Deal found 10/28$329
This United Airlines deal was found by Cheapflights users on 10/26. 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.
ven. 10/3112:35 pmMRY - ONT
1 stop8h 09mUnited Airlines
lun. 11/31:29 pmONT - MRY
1 stop7h 38mUnited Airlines
Deal found 10/26$334

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 octobre 28, 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

mar. 11/11

2:30 pm-5:34 pm

1 stop3h 04m

Ontario

sam. 11/15

6:00 am-10:33 am

1 stop4h 33m

$229

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

mer. 11/12

7:50 am-12:37 pm

1 stop4h 47m

Ontario

dim. 11/16

6:00 am-10:33 am

1 stop4h 33m

$249

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

sam. 12/6

2:33 pm-5:37 pm

1 stop3h 04m

Ontario

mar. 12/9

6:00 am-10:33 am

1 stop4h 33m

$279

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

jeu. 11/20

7:50 am-12:37 pm

1 stop4h 47m

Ontario

lun. 11/24

6:00 am-10:33 am

1 stop4h 33m

$279

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

lun. 11/10

3:50 pm-9:57 pm

1 stop6h 07m

Ontario

ven. 11/14

6:00 am-3:00 pm

1 stop9h 00m

$297

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

sam. 11/8

5:00 am-12:30 pm

1 stop7h 30m

Ontario

mar. 11/11

6:00 am-10:33 am

1 stop4h 33m

$299

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

sam. 11/8

5:00 am-12:30 pm

1 stop7h 30m

Ontario

mer. 11/12

6:00 am-10:33 am

1 stop4h 33m

$299

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

sam. 12/6

5:05 am-12:32 pm

1 stop7h 27m

Ontario

sam. 12/13

6:00 am-10:33 am

1 stop4h 33m

$319

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

lun. 11/24

7:50 am-12:37 pm

1 stop4h 47m

Ontario

sam. 11/29

6:00 am-10:33 am

1 stop4h 33m

$319

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

sam. 12/6

2:33 pm-5:37 pm

1 stop3h 04m

Ontario

lun. 12/8

6:00 am-10:33 am

1 stop4h 33m

$319

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/28

Showing 1-10 of 21 results
1
2
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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 October.
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 octobre 28, 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
9,001 reviews

Overall

7.4

Food

6.6

Boarding

7.7

Entertainment

7.1

Comfort

7.3

Crew

8.1

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
9,001 reviews
United Airlines
7.4
Good
9,001 reviews

Overall

7.4

Food

6.6

Boarding

7.7

Entertainment

7.1

Comfort

7.3

Crew

8.1

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 4h 47m. 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

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Alternative routes for Monterey to Ontario

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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 octobre 28, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$218Average$297FlexibilityNo cancel feeOn-time69%

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