MRY - ONT

$95 Find Cheap Flights from Monterey to Ontario

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Monterey to Ontario departing on 3/22. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Ontario

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Monterey to Ontario, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Monterey to Ontario, as well as popular online travel agencies
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41,299,237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$239
United Airlines
Fri 4/3Sun 4/5
MRY - ONT • 1 stop
Cheapest one-way
$95
Multiple Airlines
Sun 3/22
MRY - ONT • 1 stop
Top airlines
United Airlines
Cheapest • from $239 (round-trip)
United Airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Monterey and Ontario. You'll need at least 1 connection.
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Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Monterey to Ontario (MRY-ONT)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Monterey to Ontario that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Monterey to Ontario

Fri, Apr 3 - Sun, Apr 5
United Airlines Logo
7:00 pm - 10:45 pm
MRY
-
ONT
3h 45m
1 stop
United Airlines Logo
1:27 pm - 6:00 pm
ONT
-
MRY
4h 33m
1 stop
$239United Airlines
Thu, Mar 26 - Thu, Apr 2
Multiple Airlines Logo
9:34 pm - 8:06 am
MRY
-
ONT
10h 32m
1 stop
Multiple Airlines Logo
10:50 am - 9:20 pm
ONT
-
MRY
10h 30m
1 stop
$256Multiple Airlines
Wed, Mar 18 - Mon, Mar 30
United Airlines Logo
7:00 pm - 10:57 pm
MRY
-
ONT
3h 57m
1 stop
United Airlines Logo
6:49 pm - 10:39 pm
ONT
-
MRY
3h 50m
1 stop
$299United Airlines
Thu, Mar 26 - Thu, Apr 2
Multiple Airlines Logo
9:34 pm - 11:59 pm
MRY
-
ONT
26h 25m
2 stops
Multiple Airlines Logo
10:50 am - 9:20 pm
ONT
-
MRY
10h 30m
1 stop
$314Multiple Airlines
Fri, May 29 - Sun, May 31
United Airlines Logo
8:00 am - 12:12 pm
MRY
-
ONT
4h 12m
1 stop
United Airlines Logo
6:00 am - 11:10 am
ONT
-
MRY
5h 10m
1 stop
$324United Airlines
Wed, Mar 25 - Sat, Mar 28
United Airlines Logo
7:00 pm - 10:57 pm
MRY
-
ONT
3h 57m
1 stop
United Airlines Logo
1:40 pm - 6:00 pm
ONT
-
MRY
4h 20m
1 stop
$359United Airlines
Thu, Mar 26 - Mon, Mar 30
United Airlines Logo
7:00 pm - 10:57 pm
MRY
-
ONT
3h 57m
1 stop
United Airlines Logo
1:27 pm - 6:00 pm
ONT
-
MRY
4h 33m
1 stop
$360United Airlines
Sat, May 2 - Sun, May 3
United Airlines Logo
5:00 am - 5:52 pm
MRY
-
ONT
12h 52m
2 stops
United Airlines Logo
6:00 am - 11:16 am
ONT
-
MRY
5h 16m
1 stop
$365United Airlines
Thu, Mar 26 - Mon, Mar 30
United Airlines Logo
7:00 pm - 10:57 pm
MRY
-
ONT
3h 57m
1 stop
United Airlines Logo
1:27 pm - 6:00 pm
ONT
-
MRY
4h 33m
1 stop
$388United Airlines
Tue, Mar 24 - Tue, Mar 31
United Airlines Logo
5:00 am - 5:41 pm
MRY
-
ONT
12h 41m
2 stops
United Airlines Logo
6:00 am - 11:27 am
ONT
-
MRY
5h 27m
1 stop
$393United Airlines
Booking Insights

KAYAK's insights & trends for Monterey to Ontario flights

Get data-powered insights and trends into flights from Monterey to Ontario to help you find the cheapest flights, the best time to fly and much more.

Which airlines provide the cheapest flights from Monterey to Ontario?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 72 hours.

In the past 3 days, the cheapest round-trip tickets from Monterey to Ontario were found on United Airlines ($239) and Alaska Airlines ($432).

Find deals

Good to know

Cheapest flight$95
Flight from Monterey to Ontario

When to book flights from Monterey to Ontario

Are your dates flexible? Find out the best times to travel from Monterey to Ontario based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Monterey to Ontario

  • What is the cheapest flight from Monterey to Ontario?

    In the last 3 days, the lowest price for a flight from Monterey to Ontario was $109 for a one-way ticket and $239 for a round-trip.

  • Do I need a passport to fly between Monterey and Ontario?

    Even though you are not required to have a passport, keep in mind that an official ID is needed to board the airplane.

  • Which airports will I be using when flying from Monterey to Ontario?

    Monterey and Ontario are both served by 1 main airport. You will leave Monterey from Monterey Regional and will be arriving at Ontario.

  • Which aircraft models fly most regularly from Monterey to Ontario?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Monterey to Ontario?

    Star Alliance is the only airline alliance operating flights between Monterey and Ontario.

  • How does KAYAK find such low prices on flights from Monterey to Ontario?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Monterey to Ontario.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Monterey to Ontario?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario from Monterey is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Monterey to Ontario?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Ontario with an airline and back to Monterey with another airline. Booking your flights between Monterey and ONT can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Monterey to Ontario?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Ontario from Monterey up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Monterey to Ontario

 
See real verified KAYAK customer reviews for airlines flying from Monterey to Ontario. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Monterey to Ontario? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.4
United AirlinesOverall score based on 9345 reviews
7.1Entertainment
6.6Food
8.1Crew
7.7Boarding
7.3Comfort
Airline reviews

Overall we had a good experience during our flight from San Francisco to Houston.

10.0 ExcellentAgustin, Feb 2026
IAH - SFO
Read more United Airlines reviews

Overall we had a good experience during our flight from San Francisco to Houston.

it was a very short flight so my expectations were low.

Very disappointing given gate agent behavior. Filed a formal complaint with United.

Flight delayed. WiFi connectivity very poor if not existant. Last minute arrival forced me to run to catch my connection.

The power at the seat didn't work and the seat itself was difficult to adjust - this was a business class seat. Flight attendant gave me miles to compensate. The attendant was very professional and on top of his game the entire flight.

the whole trip was smooth, and as comfortable as flying is these days. flight crew was friendly and very courteous and helpful.

First class ticket gets you a choice of chips or nuts. . Just like economy Southwest. Also no screen in the seats. This is first class???!

Flight arrived 30 min early and bag was waiting at the baggage pickup. United Club HNL was one of the nicest in the system

Yet another flight in which beverage and snack service was skipped. Other that that, firmly mediocre. Landed early, to gate late due to congestion at the gates. Airline's fault or airports fault: unknown.

Teeny tiny bathrooms, crew was not realistic about when we'd arrive.

Everything you need to know for your flight from Monterey to Ontario

Information on your arrival and departure airports

Monterey (MRY)
Ontario (ONT)