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$172+ 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 9/9. Fares are subject to change and may not be available on all flights or dates of travel.
MRY — ONT
Aug 4 — Aug 111
Mon 8/4
Mon 8/11
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 July 30, 2025.

Round-trip from

$219
(United Airlines)

One-way from

$172
(Alaska Airlines)

Popular in

April

Cheapest in

September

Average price

$171
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. 12% potential increase in price ($21 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 July 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 July 30, 2025.

This United Airlines deal was found by Cheapflights users on 7/28. 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.
Tue 9/26:30 amMRY - ONT
1 stop5h 43mUnited Airlines
Sat 9/66:00 amONT - MRY
1 stop4h 31mUnited Airlines
Deal found 7/28$219
This Alaska Airlines deal was found by Cheapflights users on 7/29. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/247:56 pmMRY - ONT
2 stops13h 30mAlaska Airlines
Tue 9/307:10 amONT - MRY
2 stops11h 02mAlaska Airlines
Deal found 7/29$343

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 July 30, 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

Tue 9/2

6:30 am-12:13 pm

1 stop5h 43m

Ontario

Sat 9/6

6:00 am-10:31 am

1 stop4h 31m

$219

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

Wed 9/24

7:56 pm-9:26 am

2 stops13h 30m

Ontario

Tue 9/30

7:10 am-6:12 pm

2 stops11h 02m

$343

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

Tue 9/9

7:56 pm-9:26 am

2 stops13h 30m

$172

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

Fri 11/7

4:26 pm-6:20 pm

1 stop25h 54m

$194

MontereyOntario

MRY - ONT

MRYONT

Monterey Regional

Thu 8/21

2:20 pm-8:33 pm

1 stop6h 13m

$230

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

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 July 30, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines and 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.
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Comfort

7.8

Crew

8.5

Overall

8.0

Food

7.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Comfort

7.8

Crew

8.5

Overall

8.0

Food

7.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,896 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Comfort

7.8

Crew

8.5

Overall

8.0

Food

7.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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.

  • What are the cheapest airlines flying from Monterey to Ontario round-trip?

    United Airlines, at $219, was found to be the cheapest airline from Monterey to Ontario. An alternate airline flying to your destination would be Alaska Airlines.

  • 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.

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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 July 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$218Average$308FlexibilityNo cancel feeOn-time69%

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