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$101+ 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 9/26. Fares are subject to change and may not be available on all flights or dates of travel.
MRY — ONT
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
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 September 11, 2025.

Round-trip from

$229
(United Airlines)

One-way from

$101
(Trip.com)

Popular in

April

Cheapest in

September

Average price

$120
From Monterey Regional to Ontario
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One-way flight from Monterey Regional to Ontario
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Highest demand for flights based on searches. 11% potential increase in price ($20 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($3 potential savings vs. average RT price).
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Average for round-trip flights in September 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 September 11, 2025.

This United Airlines deal was found by Cheapflights users on 9/11. 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 9/266:15 amMRY - ONT
1 stop5h 58mUnited Airlines
Tue 9/306:36 pmONT - MRY
1 stop3h 02mUnited Airlines
Deal found 9/11$229
This United Airlines deal was found by Cheapflights users on 9/11. 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 9/152:20 pmMRY - ONT
1 stop3h 17mUnited Airlines
Sat 9/206:00 amONT - MRY
1 stop4h 31mUnited Airlines
Deal found 9/11$257
This United Airlines deal was found by Cheapflights users on 9/10. 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 10/36:15 amMRY - ONT
1 stop5h 58mUnited Airlines
Sun 10/56:36 pmONT - MRY
1 stop3h 02mUnited Airlines
Deal found 9/10$279
This United Airlines deal was found by Cheapflights users on 9/9. 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 9/252:19 pmMRY - ONT
1 stop3h 21mUnited Airlines
Tue 9/306:36 pmONT - MRY
1 stop3h 02mUnited Airlines
Deal found 9/9$284
This United Airlines deal was found by Cheapflights users on 9/10. 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 9/236:30 amMRY - ONT
1 stop5h 43mUnited Airlines
Tue 9/306:36 pmONT - MRY
1 stop3h 02mUnited Airlines
Deal found 9/10$294
This United Airlines deal was found by Cheapflights users on 9/10. 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 10/36:15 amMRY - ONT
1 stop5h 58mUnited Airlines
Mon 10/66:36 pmONT - MRY
1 stop3h 02mUnited Airlines
Deal found 9/10$314
This United Airlines deal was found by Cheapflights users on 9/10. 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 9/176:30 amMRY - ONT
1 stop5h 43mUnited Airlines
Sat 9/206:00 amONT - MRY
1 stop4h 31mUnited Airlines
Deal found 9/10$324
This Alaska Airlines deal was found by Cheapflights users on 9/10. 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.
Fri 11/1411:14 amMRY - ONT
1 stop12h 18mAlaska Airlines
Mon 11/176:11 pmONT - MRY
1 stop16h 26mAlaska Airlines
Deal found 9/10$342
This United Airlines deal was found by Cheapflights users on 9/10. 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 11/222:30 pmMRY - ONT
1 stop3h 04mUnited Airlines
Wed 12/36:00 amONT - MRY
1 stop4h 25mUnited Airlines
Deal found 9/10$344
This lol.travel deal was found by Cheapflights users on 9/11. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/26:15 amMRY - ONT
1 stop5h 58mUnited Airlines
Sun 10/56:36 pmONT - MRY
1 stop3h 02mUnited Airlines
Deal found 9/11$349
This Alaska Airlines deal was found by Cheapflights users on 9/10. 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.
Fri 11/217:46 pmMRY - ONT
1 stop14h 09mAlaska Airlines
Sun 11/236:00 amONT - MRY
1 stop13h 09mAlaska Airlines
Deal found 9/10$352
This United Airlines deal was found by Cheapflights users on 9/10. 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 10/26:15 amMRY - ONT
1 stop5h 58mUnited Airlines
Fri 10/36:36 pmONT - MRY
1 stop15h 55mUnited Airlines
Deal found 9/10$362

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 September 11, 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

Fri 10/3

6:15 am-12:13 pm

1 stop5h 58m

Ontario

Sun 10/5

6:36 pm-9:38 pm

1 stop3h 02m

$279

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

Sat 10/18

2:19 pm-5:40 pm

1 stop3h 21m

Ontario

Mon 10/20

6:36 pm-9:38 pm

1 stop3h 02m

$279

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

Thu 10/16

2:19 pm-5:40 pm

1 stop3h 21m

Ontario

Mon 10/20

6:36 pm-9:38 pm

1 stop3h 02m

$279

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

Thu 11/13

7:50 am-12:37 pm

1 stop4h 47m

Ontario

Mon 11/24

6:00 am-10:33 am

1 stop4h 33m

$279

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

Tue 9/23

6:30 am-12:13 pm

1 stop5h 43m

Ontario

Tue 9/30

6:36 pm-9:38 pm

1 stop3h 02m

$294

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

Fri 10/3

6:15 am-12:13 pm

1 stop5h 58m

Ontario

Mon 10/6

6:36 pm-9:38 pm

1 stop3h 02m

$314

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

Thu 11/13

7:50 am-12:37 pm

1 stop4h 47m

Ontario

Mon 11/17

6:38 pm-9:58 pm

1 stop3h 20m

$314

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

Fri 11/14

11:14 am-11:32 pm

1 stop12h 18m

Ontario

Mon 11/17

6:11 pm-10:37 am

1 stop16h 26m

$342

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

Fri 12/5

7:00 am-12:17 pm

1 stop5h 17m

Ontario

Sun 12/7

6:00 am-10:25 am

1 stop4h 25m

$344

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

Sat 11/22

2:30 pm-5:34 pm

1 stop3h 04m

Ontario

Wed 12/3

6:00 am-10:25 am

1 stop4h 25m

$344

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/11

Showing 1-10 of 23 results
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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, August is the cheapest month in which you can book a flight from Monterey to Ontario (average of $246). Flying from Monterey to Ontario in March is currently the most expensive (average of $328). 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 September 11, 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
8,937 reviews

Boarding

7.7

Entertainment

7.1

Comfort

7.3

Food

6.6

Crew

8.1

Overall

7.4

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
8,937 reviews
United Airlines
7.4
Good
8,937 reviews

Boarding

7.7

Entertainment

7.1

Comfort

7.3

Food

6.6

Crew

8.1

Overall

7.4

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, August is the cheapest month in which you can book a flight from Monterey to Ontario (average of $246). Flying from Monterey to Ontario in March is currently the most expensive (average of $328). 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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$218Average$318FlexibilityNo cancel feeOn-time69%

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