ONT - MLU

$402 Find Cheap Flights from Ontario to Monroe

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ontario to Monroe departing on 6/3. 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 Monroe

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Monroe, 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 Ontario to Monroe, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$413
American Airlines
Sun 5/24Sun 5/31
ONT - MLU • 1 stop
Cheapest one-way
$402
Delta
Wed 6/3
ONT - MLU • 1 stop
Nonstop flights
Not available
There are currently no direct flights between Ontario and Monroe. You'll need at least 1 connection.
Insights
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Top layover airports
Atlanta (ATL)
Cheapest • Avg $427 (round-trip)
Dallas (DFW)
Shortest trip • 6h 02m (one-way)
Insights
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Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Ontario to Monroe (ONT-MLU)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to Monroe 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 Ontario to Monroe

Sun, May 24 - Sun, May 31
American Airlines Logo
11:59 pm - 9:48 am
ONT
-
MLU
7h 49m
1 stop
American Airlines Logo
5:30 am - 9:31 am
MLU
-
ONT
6h 01m
1 stop
$413American Airlines
Sun, May 24 - Sun, May 31
American Airlines Logo
7:12 pm - 9:48 am
ONT
-
MLU
12h 36m
2 stops
American Airlines Logo
5:30 am - 9:31 am
MLU
-
ONT
6h 01m
1 stop
$419American Airlines
Fri, Jul 24 - Mon, Jul 27
American Airlines Logo
11:59 pm - 9:49 am
ONT
-
MLU
7h 50m
1 stop
American Airlines Logo
6:44 pm - 11:59 pm
MLU
-
ONT
7h 15m
1 stop
$453American Airlines
Fri, Jul 24 - Mon, Jul 27
American Airlines Logo
7:14 pm - 9:49 am
ONT
-
MLU
12h 35m
2 stops
American Airlines Logo
6:44 pm - 10:32 pm
MLU
-
ONT
5h 48m
1 stop
$459American Airlines
Fri, Jul 24 - Mon, Jul 27
American Airlines Logo
7:14 pm - 9:49 am
ONT
-
MLU
12h 35m
2 stops
American Airlines Logo
1:43 pm - 9:44 pm
MLU
-
ONT
10h 01m
2 stops
$464American Airlines
Thu, May 14 - Sat, May 16
American Airlines Logo
11:59 pm - 9:40 am
ONT
-
MLU
7h 41m
1 stop
American Airlines Logo
6:39 pm - 10:40 pm
MLU
-
ONT
6h 01m
1 stop
$587American Airlines
Thu, May 14 - Sat, May 16
American Airlines Logo
7:35 pm - 9:40 am
ONT
-
MLU
12h 05m
2 stops
American Airlines Logo
6:39 pm - 10:40 pm
MLU
-
ONT
6h 01m
1 stop
$593American Airlines
Mon, May 11 - Sat, May 16
American Airlines Logo
12:19 pm - 10:33 pm
ONT
-
MLU
8h 14m
2 stops
American Airlines Logo
6:39 pm - 10:40 pm
MLU
-
ONT
6h 01m
1 stop
$621American Airlines
Sun, May 24 - Sun, May 31
American Airlines Logo
7:12 pm - 9:48 am
ONT
-
MLU
12h 36m
2 stops
American Airlines Logo
1:42 pm - 9:57 pm
MLU
-
ONT
10h 15m
2 stops
$646American Airlines
Mon, May 11 - Sat, May 16
American Airlines Logo
12:19 pm - 10:33 pm
ONT
-
MLU
8h 14m
2 stops
American Airlines Logo
10:10 am - 7:34 pm
MLU
-
ONT
11h 24m
2 stops
$714American Airlines
Booking Insights

KAYAK's insights & trends for Ontario to Monroe flights

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

What is the most popular layover airport when flying from Ontario to Monroe?

Percentage of 1-stop round-trip flights from Ontario to Monroe chosen by KAYAK users via each layover airport in the last 12 months (only includes trips with the same layover airport on both legs).

Dallas (DFW) is the top choice – 96% of KAYAK users who clicked on 1-stop flights from Ontario to Monroe picked an itinerary connecting there.

What is the cheapest layover airport when flying from Ontario to Monroe?

Average round-trip price for 1-stop flights from Ontario to Monroe clicked by KAYAK users in the last 12 months (only includes trips with the same layover airport on both legs).

Flights via Atlanta (ATL) offer the most affordable fares, with an average round-trip price of $427.

Which layover airport offers the shortest total travel time from Ontario to Monroe?

Shortest average total travel time for 1-stop one-way flights from Ontario to Monroe via different layover airports, based on KAYAK user data from the last 12 months.

Consider flying via Dallas (DFW) for the shortest journey. The average one-way travel time for flights connecting there is 6h 02m.

Which layover airport has the quickest connection when flying from Ontario to Monroe?

Average layover duration at different layover airports for 1-stop one-way flights from Ontario to Monroe, based on KAYAK user data from the last 12 months.

If you prefer a quick connection, Atlanta (ATL) often has the shortest layovers from Ontario to Monroe, with an average of 1h 23m.

Find deals

Good to know

Cheapest flight$402
Flight from Ontario to Monroe

When to book flights from Ontario to Monroe

Are your dates flexible? Find out the best times to travel from Ontario to Monroe 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 Ontario to Monroe

  • What is the cheapest flight from Ontario to Monroe?

    In the last 3 days, the lowest price for a flight from Ontario to Monroe was $402 for a one-way ticket and $413 for a round-trip.

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

    A passport is not required to fly from Ontario to Monroe.

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

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

  • Which airline alliances offer flights from Ontario to Monroe?

    oneworld is the only airline alliance operating flights between Ontario and Monroe.

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

    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 Ontario to Monroe.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Monroe from Ontario 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 Ontario to Monroe?

    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 Monroe with an airline and back to Ontario with another airline. Booking your flights between Ontario and MLU 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 Ontario to Monroe?

    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 Monroe from Ontario 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 Ontario to Monroe

 
See real verified KAYAK customer reviews for airlines flying from Ontario to Monroe. 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 Ontario to Monroe? 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.
7.1
American AirlinesOverall score based on 11678 reviews
6.4Food
7.2Comfort
7.5Boarding
6.9Entertainment
7.9Crew
Airline reviews

Boarding gate at LAX was too crowded—two gates next to one another

8.0 ExcellentGary, Apr 2026
LAX - JFK
Read more American Airlines reviews

Boarding gate at LAX was too crowded—two gates next to one another

On time departure and early arrival. Flight attendant very nice.

The SFO Lounge crew were amazing. The bartender Faris was great. Thanks!

Was not able to do a online check-in because the American Airlines system doesn't store our visa or other passport information, allowing us to have a trouble-free check-in. We were forced to have to check-in at the counter which Changes are upgrade status given that we were not able to check in much earlier.

Good flight, seated and had a water within 5 minutes. Crew was hospitable.

We left at 1030 am pacific from LA and supposed to land at 7 pm Eastern in NY. They made a detour, stopped in Philadelphia and didn’t land till 1130 PM Eastern!!! Worst flight experience with no pilot communication with no explanation as to what was going on. Everyone was very frustrated to say the least.

Flight boarded from Gate 159B, the farthest gate in the LAX Bradley Terminal. While the flight operated on time, the first class cabin attendant made no recognition of my being an Advantage Executive Platinum member.

The flight itself was excellent but the gate attendant made me check my carryon since she said it was an inch too big. I’ve had no problems with this carryon on recent flights on Qantas, Delta, Austrian, Southwest Airlines even though the overhead bins are the same size. there were other carryons in the bins that also looked larger than mine and there was room left in the bins for more. When I picked up my carryon from baggage claim one of the wheels had broken off.

I was in last row so that is never great bc the person in front of me leaned his seat all the way back into me.

The experience at checkin for my American Airlines flight from Sacramento to LAX was very good including the assistance I received in getting my bags checked in and boarding passes printed. Was pleasantly surprised the my bags were checked through all the way to my destination at Clark International Airport in Angeles, Philippines.

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

Information on your arrival and departure airports

Ontario (ONT)
Monroe (MLU)