$169 Cheap Flights from Monroe (MLU) to Ontario (ONT)

View $169 flight on Thu, Aug 14, 2025Opens in a new window

Popular airlines from Monroe, LA (MLU-Monroe Regional) to Los Angeles - Ontario Intl. Airport (ONT)

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Cheap Flights from Monroe to Ontario (MLU-ONT)

Prices were available within the past 7 days and start at $169 for one-way flights and $338 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Sat, Aug 23 - Wed, Aug 27
MLU
Monroe
ONT
Ontario
$338 Roundtrip, found 9 hours ago
$338
Roundtrip
found 9 hours ago
Select American Airlines flight, departing Sat, Aug 23 from Monroe to Ontario, returning Wed, Aug 27, priced at $338 found 9 hours ago
Delta
Sat, Aug 23 - Wed, Aug 27
MLU
Monroe
ONT
Ontario
$338 Roundtrip, found 9 hours ago
$338
Roundtrip
found 9 hours ago
Select Delta flight, departing Sat, Aug 23 from Monroe to Ontario, returning Wed, Aug 27, priced at $338 found 9 hours ago
American Airlines
Sat, Aug 23 - Thu, Aug 28
MLU
Monroe
ONT
Ontario
$343 Roundtrip, found 22 hours ago
$343
Roundtrip
found 22 hours ago
Select American Airlines flight, departing Sat, Aug 23 from Monroe to Ontario, returning Thu, Aug 28, priced at $343 found 22 hours ago
American Airlines
Wed, Aug 6 - Sun, Aug 10
MLU
Monroe
ONT
Ontario
$344 Roundtrip, found 1 day ago
$344
Roundtrip
found 1 day ago
Select American Airlines flight, departing Wed, Aug 6 from Monroe to Ontario, returning Sun, Aug 10, priced at $344 found 1 day ago
American Airlines
Thu, Sep 11 - Tue, Sep 16
MLU
Monroe
ONT
Ontario
$345 Roundtrip, found 8 hours ago
$345
Roundtrip
found 8 hours ago
Select American Airlines flight, departing Thu, Sep 11 from Monroe to Ontario, returning Tue, Sep 16, priced at $345 found 8 hours ago
American Airlines
Thu, Sep 11 - Tue, Sep 16
MLU
Monroe
ONT
Ontario
$347 Roundtrip, found 8 hours ago
$347
Roundtrip
found 8 hours ago
Select American Airlines flight, departing Thu, Sep 11 from Monroe to Ontario, returning Tue, Sep 16, priced at $347 found 8 hours ago
American Airlines
Thu, Sep 11 - Tue, Sep 16
MLU
Monroe
ONT
Ontario
$349 Roundtrip, found 8 hours ago
$349
Roundtrip
found 8 hours ago
Select American Airlines flight, departing Thu, Sep 11 from Monroe to Ontario, returning Tue, Sep 16, priced at $349 found 8 hours ago
Delta
Tue, Jan 6 - Sat, Jan 24
MLU
Monroe
ONT
Ontario
$353 Roundtrip, found 5 days ago
$353
Roundtrip
found 5 days ago
Select Delta flight, departing Tue, Jan 6 from Monroe to Ontario, returning Sat, Jan 24, priced at $353 found 5 days ago
Delta
Wed, Jan 7 - Tue, Jan 20
MLU
Monroe
ONT
Ontario
$359 Roundtrip, found 5 days ago
$359
Roundtrip
found 5 days ago
Select Delta flight, departing Wed, Jan 7 from Monroe to Ontario, returning Tue, Jan 20, priced at $359 found 5 days ago
Delta
Thu, Aug 14 - Sun, Aug 17
MLU
Monroe
ONT
Ontario
$363 Roundtrip, found 3 hours ago
$363
Roundtrip
found 3 hours ago
Select Delta flight, departing Thu, Aug 14 from Monroe to Ontario, returning Sun, Aug 17, priced at $363 found 3 hours ago

Find the cheapest month to fly from Monroe (MLU) to Ontario (ONT)

September is typically the cheapest month to fly

From $258 - $898 per traveler.

Graph displaying average flight prices per month

Alternative airports near Ontario

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to John Wayne SNA. Average driving time to city center is 42 minutes. Flights from $423
SNA
John Wayne
Average driving time to city center42 min
Flights from $423
Flights from Monroe (MLU) to Ontario (ONT)
Origin airport
Monroe Regional
Destination airport
Los Angeles - Ontario Intl.
Airlines serving
American Airlines, Delta
Roundtrip price
$338
Distance
1475 mi

Monroe to Ontario Flights

The cheapest times to fly from Monroe to Ontario

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Monroe to Ontario are during the month of August. You can find some of the cheapest flights from Monroe to Ontario with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Monroe to Ontario

Sunday is one of the best days to book for cheap flights from Monroe to Ontario: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Monroe to Ontario

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Monroe to Ontario in 2025. You can also book with separate airlines for your outbound and return journeys, from $169 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Monroe to Ontario flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Monroe to Ontario airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Monroe Regional Airport (MLU) to Los Angeles - Ontario Intl. Airport (ONT) cost?
Discover the latest flight deals from MLU to ONT by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from MLU to ONT?
The cheapest flights from MLU to ONT are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from MLU to ONT?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from MLU to ONT. Sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Monroe Regional Airport (MLU) to Los Angeles - Ontario Intl. Airport (ONT)?
You'll have to catch a flight with a layover when traveling from Monroe Regional Airport (MLU) to Los Angeles - Ontario Intl. Airport (ONT). Direct flights don't operate daily on this route. However, simply filter your search to include one or more stops to find an option that works for you.
What day of the week has the most flights from MLU to ONT?
You'll usually find Tuesday the quietest day for flights, while Fridays tend to be the busiest.* However this can vary from season to season and during peak travel times or public holidays.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Monroe Regional Airport (MLU) to Los Angeles - Ontario Intl. Airport (ONT)?
To avoid possible delays on the Monroe Regional Airport (MLU) to Los Angeles - Ontario Intl. Airport (ONT) route, aim to fly before 3 PM. Departures after this hour have a 22% higher chance of cancellation.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Monroe Regional Airport (MLU) to Los Angeles - Ontario Intl. Airport (ONT) last-minute?
Holding off until right before your break to book your flight from MLU to ONT often results in higher prices. While you might find some last-minute offers, there's no guarantee. Keep your travel schedule open to maximize your chances of getting a bargain.
Is it cheaper to book a MLU to ONT flight and hotel package?
You'll generally save money by securing a MLU to ONT flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it's simple to manage it all in one convenient place. After selecting your preferred flights and accommodations, consider adding extras including car rentals, tours and activities.
Can I cancel or change the date of my flight from Monroe Regional Airport (MLU) to Los Angeles - Ontario Intl. Airport (ONT)?
You can usually reschedule or cancel your MLU to ONT flight. However, if the booking was made more than 24 hours ago, additional charges may apply. Refer to your airline's policies in your itinerary to see what changes are possible and whether any costs are involved. You'll also find further details on our Customer Service portal.

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*Available to One Key members.