$368+ Cheap flights from Ontario to Monroe (ONT - MLU)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/18. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — MLU
Oct 18 — Oct 251
Round-trip
1 adult, Economy
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Find cheap flights from Ontario to Monroe with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Ontario to Monroe
Cheapest
Best
Last-minute
One-way
Cheapest flights from Ontario to MonroeExplore the most affordable flight options available from Ontario to Monroe. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 18, 2026.
Explore the most affordable flight options available from Ontario to Monroe. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 18, 2026.
This American Airlines deal was found by Cheapflights users on 9/15. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2912:43 pm -
1 stop7h 53m
Sun 11/16:00 am -
1 stop5h 40m
Deal found 9/15![American Airlines logo]()
$538
This Delta deal was found by Cheapflights users on 9/15. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2912:16 pm -
1 stop7h 53m
Sun 11/11:05 pm -
2 stops11h 06m
Deal found 9/15![Delta logo]()
$589
Best flights from Ontario to MonroeDiscover carefully curated flight deals from Ontario to Monroe that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 18, 2026.
Discover carefully curated flight deals from Ontario to Monroe that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 18, 2026.
This American Airlines deal was found by Cheapflights users on 9/15. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2912:43 pm -
1 stop7h 53m
Sun 11/16:00 am -
1 stop5h 40m
Deal found 9/15![American Airlines logo]()
$538
This Delta deal was found by Cheapflights users on 9/15. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/299:45 am -
2 stops10h 24m
Sun 11/11:05 pm -
2 stops11h 06m
Deal found 9/15![Delta logo]()
$594
Last-minute flights from Ontario to MonroeDiscover last-minute flight deals from Ontario to Monroe. Data last updated September 18, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Monroe. Data last updated September 18, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 9/15. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2912:43 pm -
1 stop7h 53m
Sun 11/16:00 am -
1 stop5h 40m
Deal found 9/15![American Airlines logo]()
$538
This Delta deal was found by Cheapflights users on 9/15. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2912:16 pm -
1 stop7h 53m
Sun 11/11:05 pm -
2 stops11h 06m
Deal found 9/15![Delta logo]()
$589
One-way flights from Ontario to MonroeSearch for one-way flight options from Ontario to Monroe. Find affordable one-way fares based on user searches. Data last updated September 18, 2026.
Search for one-way flight options from Ontario to Monroe. Find affordable one-way fares based on user searches. Data last updated September 18, 2026.
This KAYAK deal was found by Cheapflights users on 9/16. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/1811:59 pm -
1 stop7h 45m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![American Airlines logo]()
$368
This KAYAK deal was found by Cheapflights users on 9/16. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/1912:16 pm -
1 stop7h 53m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Delta logo]()
$384
This American Airlines deal was found by Cheapflights users on 9/17. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/610:25 am -
1 stop5h 53m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/17![American Airlines logo]()
$447
Find flight deals from Ontario to Monroe
Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Monroe (MLU). 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 September 18, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $538 (American Airlines) |
One-way from | $368 (KAYAK) |
Popular in | December |
Cheapest in | January |
Average price | $448 |
Cheapflights Fare Finder
Customize your flight search to find flights from Ontario to Monroe 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 7,457,451 searches. Data last updated September 18, 2026.
Use the filters below to find and compare flights from Ontario to Monroe that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
OntarioMonroe
ONT Ontario - MLU Monroe Huenefeld
ONTMLU
Ontario
Mon 10/19
12:43 pm-10:36 pm
1 stop7h 53m
Monroe Huenefeld
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$368
OntarioMonroe
ONT Ontario - MLU Monroe Huenefeld
ONTMLU
Ontario
Mon 10/19
12:16 pm-10:09 pm
1 stop7h 53m
Monroe Huenefeld
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$384
Quickest round-trip
OntarioMonroe
ONT Ontario - MLU Monroe Huenefeld
ONTMLU
Ontario
Tue 10/6
10:25 am-6:18 pm
1 stop5h 53m
Monroe Huenefeld
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$447
OntarioMonroe
ONT Ontario - MLU Monroe Huenefeld
ONTMLU
Ontario
Thu 10/29
12:43 pm-10:36 pm
1 stop7h 53m
Monroe Huenefeld
Sun 11/1
6:00 am-9:40 am
1 stop5h 40m
$538
OntarioMonroe
ONT Ontario - MLU Monroe Huenefeld
ONTMLU
Ontario
Thu 10/29
9:45 am-10:09 pm
2 stops10h 24m
Monroe Huenefeld
Sun 11/1
1:05 pm-10:11 pm
2 stops11h 06m
$594
Sorted by cheapest first
Compare providers for flights from Ontario to Monroe
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to Monroe in September.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Ontario-Monroe flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Monroe flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-Monroe flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Ontario-Monroe flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ontario-Monroe flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from Ontario to Monroe
Have a flexible travel schedule? Discover the best time to fly to Monroe from Ontario with our price prediction graph.
ONT-MLU
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.
Reviews of airlines servicing Monroe
Get insights into the airlines that provide service to Monroe. 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 Monroe. Reviews last updated September 18, 2026.
Get a feel of what it's like to fly with American Airlines from Ontario to Monroe by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Comfort
7.2
Crew
7.9
Overall
7.1
Entertainment
6.8
Food
6.4
Boarding
7.4
Reviews
1 / 20
2.0
MediocreJeremy,Sep 2025
SAN - PHL
Comfort
7.2
Crew
7.9
Overall
7.1
Entertainment
6.8
Food
6.4
Boarding
7.4
Reviews
1 / 20
2.0
MediocreJeremy,Sep 2025
SAN - PHL
Related info for your journey
Find useful and relevant information for your journey from Ontario to Monroe. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near Monroe?
Book flights to Monroe if you plan to visit one of these locationsRuston
West Monroe
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Other flights to Monroe
Explore flights to Monroe departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on September 18, 2026.
Ontario and Monroe flights
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Top airline flying from Ontario to Monroe
Discover the top airline that operate flights from Ontario to Monroe. 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 7,457,451 searches. Data last updated September 18, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$398 | Average$620 | FlexibilityNo cancel fee | On-time71% |