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Ontario

$152+ 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 3/13. Fares are subject to change and may not be available on all flights or dates of travel.
MRY — ONT
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
1 adult, Economy
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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 January 29, 2026.

This Kiwi.com deal was found by Cheapflights users on 1/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/194:19 pm
MRY
-
ONT
1 stop15h 03m
Multiple Airlines
Wed 2/257:17 pm
ONT
-
MRY
1 stop20h 10m
Multiple Airlines
Deal found 1/27$218
This Alaska Airlines deal was found by Cheapflights users on 1/27. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/294:44 pm
MRY
-
ONT
1 stop5h 48m
Alaska Airlines
Wed 5/66:00 am
ONT
-
MRY
1 stop10h 07m
Alaska Airlines
Deal found 1/27$293
This United Airlines deal was found by Cheapflights users on 1/27. 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.
Tue 4/288:05 am
MRY
-
ONT
1 stop4h 09m
United Airlines
Tue 5/51:30 pm
ONT
-
MRY
1 stop4h 38m
United Airlines
Deal found 1/27$299
This United Airlines deal was found by Cheapflights users on 1/28. 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.
Thu 2/196:03 pm
MRY
-
ONT
1 stop4h 54m
United Airlines
Mon 2/231:50 pm
ONT
-
MRY
1 stop3h 30m
United Airlines
Deal found 1/28$301
This Alaska Airlines deal was found by Cheapflights users on 1/27. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/294:44 pm
MRY
-
ONT
1 stop5h 48m
Alaska Airlines
Fri 5/17:59 pm
ONT
-
MRY
1 stop20h 08m
Alaska Airlines
Deal found 1/27$303
This United Airlines deal was found by Cheapflights users on 1/26. 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.
Tue 2/105:00 am
MRY
-
ONT
1 stop7h 47m
United Airlines
Sat 2/141:45 pm
ONT
-
MRY
1 stop7h 40m
United Airlines
Deal found 1/26$309
This United Airlines deal was found by Cheapflights users on 1/28. 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.
Fri 2/66:40 am
MRY
-
ONT
1 stop4h 38m
United Airlines
Thu 2/126:37 pm
ONT
-
MRY
1 stop3h 52m
United Airlines
Deal found 1/28$319
This United Airlines deal was found by Cheapflights users on 1/29. 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.
Fri 2/66:40 am
MRY
-
ONT
1 stop4h 38m
United Airlines
Sun 2/86:39 pm
ONT
-
MRY
1 stop3h 20m
United Airlines
Deal found 1/29$329
This United Airlines deal was found by Cheapflights users on 1/27. 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.
Fri 2/136:03 pm
MRY
-
ONT
1 stop4h 54m
United Airlines
Mon 2/161:50 pm
ONT
-
MRY
1 stop3h 30m
United Airlines
Deal found 1/27$333
This United Airlines deal was found by Cheapflights users on 1/29. 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.
Fri 4/107:00 pm
MRY
-
ONT
1 stop3h 45m
United Airlines
Mon 4/136:00 am
ONT
-
MRY
1 stop5h 27m
United Airlines
Deal found 1/29$339
This United Airlines deal was found by Cheapflights users on 1/27. 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.
Mon 4/278:05 am
MRY
-
ONT
1 stop4h 09m
United Airlines
Mon 5/46:59 pm
ONT
-
MRY
1 stop3h 24m
United Airlines
Deal found 1/27$340

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 January 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$218
(Kiwi.com)

One-way from

$152
(Alaska Airlines)

Popular in

December

Cheapest in

February

Average price

$179
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. 10% potential increase in price ($21 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($3 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
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 January 29, 2026.
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

Wed 4/29

4:44 pm-10:32 pm

1 stop5h 48m

Ontario

Wed 5/6

6:00 am-4:07 pm

1 stop10h 07m

$293

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

Tue 4/28

8:05 am-12:14 pm

1 stop4h 09m

Ontario

Tue 5/5

1:30 pm-6:08 pm

1 stop4h 38m

$299

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

Wed 4/29

8:05 am-12:14 pm

1 stop4h 09m

Ontario

Sat 5/2

1:30 pm-6:08 pm

1 stop4h 38m

$299

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

Sat 2/28

5:00 am-12:43 pm

1 stop7h 43m

Ontario

Wed 3/11

1:40 pm-6:00 pm

1 stop4h 20m

$299

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

Tue 4/28

8:05 am-12:14 pm

1 stop4h 09m

Ontario

Mon 5/4

6:59 pm-10:23 pm

1 stop3h 24m

$299

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

Wed 4/29

8:05 am-12:14 pm

1 stop4h 09m

Ontario

Mon 5/4

6:59 pm-10:23 pm

1 stop3h 24m

$299

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

Fri 4/3

7:00 pm-10:45 pm

1 stop3h 45m

Ontario

Sun 4/5

6:00 am-11:27 am

1 stop5h 27m

$299

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

Tue 4/28

8:05 am-12:14 pm

1 stop4h 09m

Ontario

Sat 5/2

1:30 pm-6:08 pm

1 stop4h 38m

$299

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

Fri 2/27

6:03 pm-10:57 pm

1 stop4h 54m

Ontario

Fri 3/6

1:40 pm-6:00 pm

1 stop4h 20m

$299

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

Thu 2/19

6:03 pm-10:57 pm

1 stop4h 54m

Ontario

Mon 2/23

1:50 pm-5:20 pm

1 stop3h 30m

$301

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/28

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 January.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice 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 FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Monterey-Ontario flight deals on Cheapflights vs. FlightHub >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 FlightHub the most. FlightHub 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 January 29, 2026.
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
9,215 reviews

Overall

7.4

Entertainment

7.1

Food

6.6

Crew

8.1

Boarding

7.7

Comfort

7.3

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
9,215 reviews
United Airlines
7.4
Good
9,215 reviews

Overall

7.4

Entertainment

7.1

Food

6.6

Crew

8.1

Boarding

7.7

Comfort

7.3

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 09m. Monterey and Ontario are separated by a distance of 296 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • 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 January 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$218Average$297FlexibilityNo cancel feeOn-time69%

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