ONT - MLU

$398 Find Cheap Flights from Ontario to Monroe

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ontario to Monroe departing on 4/15. 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
$398
American Airlines
Wed 4/15Wed 4/22
ONT - MLU • 1 stop
Cheapest one-way
$422
American Airlines
Sat 3/21
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.
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Top layover airports
Atlanta (ATL)
Cheapest • Avg $427 (round-trip)
Dallas (DFW)
Shortest trip • 5h 59m (one-way)
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We hope you love your trip to Monroe!
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

Wed, Apr 15 - Wed, Apr 22
American Airlines Logo
11:59 pm - 9:40 am
ONT
-
MLU
7h 41m
1 stop
American Airlines Logo
6:39 pm - 10:36 pm
MLU
-
ONT
5h 57m
1 stop
$398American Airlines
Wed, Apr 15 - Wed, Apr 22
American Airlines Logo
11:59 pm - 9:40 am
ONT
-
MLU
7h 41m
1 stop
American Airlines Logo
10:10 am - 6:30 pm
MLU
-
ONT
10h 20m
2 stops
$404American Airlines
Wed, Apr 15 - Wed, Apr 22
American Airlines Logo
12:19 pm - 10:33 pm
ONT
-
MLU
8h 14m
2 stops
American Airlines Logo
10:10 am - 6:30 pm
MLU
-
ONT
10h 20m
2 stops
$465American 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 5h 59m.

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$398
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 $422 for a one-way ticket and $398 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 11467 reviews
7.5Boarding
7.2Comfort
6.4Food
7.9Crew
6.9Entertainment
Airline reviews

Delay after delay with little communication then AA lost my luggage and at airport would not assist just said scan this QR code to track your luggage and submit a claim. However QR code provided did not work so have to go back to airport

4.0 OkaySean, Mar 2026
PSP - DFW
Read more American Airlines reviews

Delay after delay with little communication then AA lost my luggage and at airport would not assist just said scan this QR code to track your luggage and submit a claim. However QR code provided did not work so have to go back to airport

Dloght delayed by 2.5 hrs . Common theme in my last four american floghts

They are rarely on time! Very hard to plan your travels when flights or connections keep getting delayed.

My seat was assigned last row behind restrooms No legroom’s I’m very Pettit Still was not comfortable Food choice was excellent

The chicken wrap was tiny ($13 for what looked like a 1/3 of a normal wrap?) and disgusting.

Mediocre would be best description. Food bland. Seat biz class uncomfortable to sleep. Crew never dimmed lights completely in an overnight flight to Europe. Would avoid AA if possible.

Small plane, poor meal choices for first class, bad terminal and boarding experience at LAX

Massimo, flight attendant was very authentic, attentive - wonderful. Food/wrap was just okay.

Experience was great. The best part is the free Wi-Fi connection which helps me to work on the flight

The flight was fine. It's the satellite terminal that supports American eagle flights is what sucks. There is only one food option and everything there is way overpriced. I mean I know it's airport pricing, but it's even crazier than that. I bought a sandwich in a plastic container for $18.

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

Information on your arrival and departure airports

Ontario (ONT)
Monroe (MLU)