$139+ Cheap flights from Louisville to Ontario (SDF - ONT)
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/8. Fares are subject to change and may not be available on all flights or dates of travel.
SDF — ONT
Sep 14 — Sep 211
Round-trip
1 adult, Economy
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Find cheap flights from Louisville to Ontario 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 Louisville to Ontario
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Cheapest flights from Louisville to OntarioExplore the most affordable flight options available from Louisville to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 15, 2026.
Explore the most affordable flight options available from Louisville to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 15, 2026.
This Southwest deal was found by Cheapflights users on 8/11. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1110:40 am -
1 stop6h 20m
Tue 9/152:10 pm -
1 stop5h 55m
Deal found 8/11![Southwest logo]()
$254
This American Airlines deal was found by Cheapflights users on 8/11. 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.
Wed 9/27:03 am -
1 stop7h 40m
Wed 9/912:37 pm -
1 stop6h 06m
Deal found 8/11![American Airlines logo]()
$267
This Delta deal was found by Cheapflights users on 8/13. 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.
Tue 9/157:05 am -
1 stop7h 00m
Mon 9/2110:00 pm -
1 stop7h 51m
Deal found 8/13![Delta logo]()
$277
This Delta deal was found by Cheapflights users on 8/12. 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.
Sat 9/56:00 am -
1 stop7h 42m
Sat 9/1212:17 pm -
1 stop8h 42m
Deal found 8/12![Delta logo]()
$283
This Southwest deal was found by Cheapflights users on 8/13. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1011:05 am -
1 stop7h 00m
Mon 9/1411:55 pm -
1 stop8h 20m
Deal found 8/13![Southwest logo]()
$284
This United Airlines deal was found by Cheapflights users on 8/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1111:00 am -
2 stops12h 01m
Tue 9/155:00 am -
1 stop6h 23m
Deal found 8/11![United Airlines logo]()
$288
This Delta deal was found by Cheapflights users on 8/12. 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.
Fri 9/41:21 pm -
1 stop8h 09m
Thu 9/1710:00 pm -
1 stop7h 51m
Deal found 8/12![Delta logo]()
$308
This Delta deal was found by Cheapflights users on 8/11. 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.
Wed 9/97:05 am -
1 stop7h 00m
Mon 9/2110:00 pm -
1 stop9h 19m
Deal found 8/11![Delta logo]()
$317
This Southwest deal was found by Cheapflights users on 8/11. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/912:10 pm -
2 stops8h 25m
Mon 9/212:40 pm -
1 stop5h 30m
Deal found 8/11![Southwest logo]()
$322
This Delta deal was found by Cheapflights users on 8/13. 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.
Wed 9/167:05 am -
1 stop7h 00m
Thu 9/2410:00 pm -
1 stop7h 51m
Deal found 8/13![Delta logo]()
$323
This Delta deal was found by Cheapflights users on 8/12. 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.
Mon 8/313:25 pm -
1 stop7h 28m
Thu 9/1710:00 pm -
1 stop7h 51m
Deal found 8/12![Delta logo]()
$324
This American Airlines deal was found by Cheapflights users on 8/13. 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 9/104:19 pm -
2 stops9h 24m
Thu 9/177:11 pm -
2 stops11h 32m
Deal found 8/13![American Airlines logo]()
$334
Best flights from Louisville to OntarioDiscover carefully curated flight deals from Louisville to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 15, 2026.
Discover carefully curated flight deals from Louisville to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 15, 2026.
This Delta deal was found by Cheapflights users on 8/13. 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.
Sat 9/197:05 am -
1 stop7h 00m
Tue 9/2212:17 pm -
1 stop6h 13m
Deal found 8/13![Delta logo]()
$277
This Southwest deal was found by Cheapflights users on 8/13. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1011:05 am -
1 stop7h 00m
Mon 9/1411:55 pm -
1 stop8h 20m
Deal found 8/13![Southwest logo]()
$284
This United Airlines deal was found by Cheapflights users on 8/13. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2810:37 am -
2 stops12h 38m
Sat 10/319:25 am -
2 stops9h 59m
Deal found 8/13![United Airlines logo]()
$387
This Delta deal was found by Cheapflights users on 8/12. 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.
Sat 9/56:00 am -
1 stop7h 42m
Sat 9/1212:17 pm -
1 stop8h 42m
Deal found 8/12![Delta logo]()
$283
This Southwest deal was found by Cheapflights users on 8/11. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/912:10 pm -
2 stops8h 25m
Mon 9/212:40 pm -
1 stop5h 30m
Deal found 8/11![Southwest logo]()
$322
This Delta deal was found by Cheapflights users on 8/11. 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.
Wed 9/97:05 am -
1 stop7h 00m
Mon 9/2110:00 pm -
1 stop9h 19m
Deal found 8/11![Delta logo]()
$317
This Southwest deal was found by Cheapflights users on 8/12. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/226:35 am -
1 stop7h 50m
Sun 10/2511:55 pm -
1 stop7h 15m
Deal found 8/12![Southwest logo]()
$367
This United Airlines deal was found by Cheapflights users on 8/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/23:24 pm -
1 stop8h 27m
Mon 11/95:00 am -
2 stops9h 02m
Deal found 8/11![United Airlines logo]()
$440
This United Airlines deal was found by Cheapflights users on 8/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/263:36 pm -
1 stop8h 22m
Wed 9/301:24 pm -
1 stop6h 08m
Deal found 8/15![United Airlines logo]()
$441
This United Airlines deal was found by Cheapflights users on 8/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/83:25 pm -
1 stop8h 28m
Thu 9/101:18 pm -
1 stop6h 11m
Deal found 8/11![United Airlines logo]()
$470
Last-minute flights from Louisville to OntarioDiscover last-minute flight deals from Louisville to Ontario. Data last updated August 15, 2026 and is based on user searches.
Discover last-minute flight deals from Louisville to Ontario. Data last updated August 15, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 8/12. 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.
Mon 8/313:25 pm -
1 stop7h 28m
Thu 9/1710:00 pm -
1 stop7h 51m
Deal found 8/12![Delta logo]()
$324
This American Airlines deal was found by Cheapflights users on 8/11. 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.
Wed 9/27:03 am -
1 stop7h 40m
Wed 9/912:37 pm -
1 stop6h 06m
Deal found 8/11![American Airlines logo]()
$267
This Delta deal was found by Cheapflights users on 8/12. 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.
Fri 9/41:21 pm -
1 stop8h 09m
Thu 9/1710:00 pm -
1 stop7h 51m
Deal found 8/12![Delta logo]()
$308
This Delta deal was found by Cheapflights users on 8/12. 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.
Sat 9/56:00 am -
1 stop7h 42m
Sat 9/1212:17 pm -
1 stop8h 42m
Deal found 8/12![Delta logo]()
$283
This Delta deal was found by Cheapflights users on 8/11. 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.
Wed 9/97:05 am -
1 stop7h 00m
Mon 9/2110:00 pm -
1 stop9h 19m
Deal found 8/11![Delta logo]()
$317
This Southwest deal was found by Cheapflights users on 8/11. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/912:10 pm -
2 stops8h 25m
Mon 9/212:40 pm -
1 stop5h 30m
Deal found 8/11![Southwest logo]()
$322
This Southwest deal was found by Cheapflights users on 8/13. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1011:05 am -
1 stop7h 00m
Mon 9/1411:55 pm -
1 stop8h 20m
Deal found 8/13![Southwest logo]()
$284
This American Airlines deal was found by Cheapflights users on 8/13. 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 9/104:19 pm -
2 stops9h 24m
Thu 9/177:11 pm -
2 stops11h 32m
Deal found 8/13![American Airlines logo]()
$334
This Southwest deal was found by Cheapflights users on 8/11. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1110:40 am -
1 stop6h 20m
Tue 9/152:10 pm -
1 stop5h 55m
Deal found 8/11![Southwest logo]()
$254
This United Airlines deal was found by Cheapflights users on 8/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1111:00 am -
2 stops12h 01m
Tue 9/155:00 am -
1 stop6h 23m
Deal found 8/11![United Airlines logo]()
$288
This Delta deal was found by Cheapflights users on 8/13. 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.
Tue 9/157:05 am -
1 stop7h 00m
Mon 9/2110:00 pm -
1 stop7h 51m
Deal found 8/13![Delta logo]()
$277
This Delta deal was found by Cheapflights users on 8/13. 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.
Wed 9/167:05 am -
1 stop7h 00m
Thu 9/2410:00 pm -
1 stop7h 51m
Deal found 8/13![Delta logo]()
$323
One-way flights from Louisville to OntarioSearch for one-way flight options from Louisville to Ontario. Find affordable one-way fares based on user searches. Data last updated August 15, 2026.
Search for one-way flight options from Louisville to Ontario. Find affordable one-way fares based on user searches. Data last updated August 15, 2026.
This Delta deal was found by Cheapflights users on 8/13. 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.
Tue 9/83:43 pm -
1 stop7h 41m
Deal found 8/13![Delta logo]()
$139
This deal was found by Cheapflights users on 8/14. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/97:05 am -
1 stop7h 00m
Deal found 8/14![Delta logo]()
$171
This Kiwi.com deal was found by Cheapflights users on 8/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/309:11 pm -
3 stops29h 36m
Deal found 8/15![Multiple Airlines logo]()
$174
This Southwest deal was found by Cheapflights users on 8/15. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/3012:10 pm -
2 stops8h 25m
Deal found 8/15![Southwest logo]()
$176
This United Airlines deal was found by Cheapflights users on 8/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/283:45 pm -
1 stop8h 55m
Deal found 8/11![United Airlines logo]()
$189
This Delta deal was found by Cheapflights users on 8/12. 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.
Fri 10/237:05 am -
1 stop7h 01m
Deal found 8/12![Delta logo]()
$192
This Kiwi.com deal was found by Cheapflights users on 8/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/19:09 pm -
3 stops46h 37m
Deal found 8/13![Multiple Airlines logo]()
$204
This United Airlines deal was found by Cheapflights users on 8/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/18:00 am -
1 stop7h 50m
Deal found 8/11![United Airlines logo]()
$218
This United Airlines deal was found by Cheapflights users on 8/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/83:25 pm -
1 stop8h 28m
Deal found 8/15![United Airlines logo]()
$221
This United Airlines deal was found by Cheapflights users on 8/13. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/63:24 pm -
2 stops10h 24m
Deal found 8/13![United Airlines logo]()
$225
Find flight deals from Louisville to Ontario
Discover tips and strategies to find the most affordable flight options for your journey from Louisville (SDF) to Ontario (ONT). 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 August 15, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $254 (Southwest) |
One-way from | $139 (Delta) |
Popular in | November |
Cheapest in | March |
Average price | $476 |
Cheapflights Fare Finder
Customize your flight search to find flights from Louisville to Ontario 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 2,558,603 searches. Data last updated August 15, 2026.
Use the filters below to find and compare flights from Louisville to Ontario that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Quickest round-trip
LouisvilleOntario
SDF Louisville Intl - ONT Ontario
SDFONT
Louisville Intl
Sat 9/19
7:05 am-11:05 am
1 stop7h 00m
Ontario
Tue 9/22
12:17 pm-9:30 pm
1 stop6h 13m
$277
LouisvilleOntario
SDF Louisville Intl - ONT Ontario
SDFONT
Louisville Intl
Sat 9/5
6:00 am-10:42 am
1 stop7h 42m
Ontario
Sat 9/12
12:17 pm-11:59 pm
1 stop8h 42m
$283
LouisvilleOntario
SDF Louisville Intl - ONT Ontario
SDFONT
Louisville Intl
Thu 9/10
11:05 am-3:05 pm
1 stop7h 00m
Ontario
Mon 9/14
11:55 pm-11:15 am
1 stop8h 20m
$284
LouisvilleOntario
SDF Louisville Intl - ONT Ontario
SDFONT
Louisville Intl
Wed 9/9
7:05 am-11:05 am
1 stop7h 00m
Ontario
Mon 9/21
10:00 pm-10:19 am
1 stop9h 19m
$317
LouisvilleOntario
SDF Louisville Intl - ONT Ontario
SDFONT
Louisville Intl
Wed 9/9
12:10 pm-5:35 pm
2 stops8h 25m
Ontario
Mon 9/21
2:40 pm-11:10 pm
1 stop5h 30m
$322
LouisvilleOntario
SDF Louisville Intl - ONT Ontario
SDFONT
Louisville Intl
Thu 10/22
6:35 am-11:25 am
1 stop7h 50m
Ontario
Sun 10/25
11:55 pm-10:10 am
1 stop7h 15m
$367
LouisvilleOntario
SDF Louisville Intl - ONT Ontario
SDFONT
Louisville Intl
Wed 10/28
10:37 am-8:15 pm
2 stops12h 38m
Ontario
Sat 10/31
9:25 am-10:24 pm
2 stops9h 59m
$387
LouisvilleOntario
SDF Louisville Intl - ONT Ontario
SDFONT
Louisville Intl
Mon 11/2
3:24 pm-8:51 pm
1 stop8h 27m
Ontario
Mon 11/9
5:00 am-5:02 pm
2 stops9h 02m
$440
LouisvilleOntario
SDF Louisville Intl - ONT Ontario
SDFONT
Louisville Intl
Sat 9/26
3:36 pm-8:58 pm
1 stop8h 22m
Ontario
Wed 9/30
1:24 pm-10:32 pm
1 stop6h 08m
$441
LouisvilleOntario
SDF Louisville Intl - ONT Ontario
SDFONT
Louisville Intl
Tue 9/8
3:25 pm-8:53 pm
1 stop8h 28m
Ontario
Thu 9/10
1:18 pm-10:29 pm
1 stop6h 11m
$470
Showing 1-10 of 21 resultsSorted by cheapest first
Compare providers for flights from Louisville to Ontario
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 Louisville to Ontario in August.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Louisville-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Louisville-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Louisville-Ontario flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Louisville-Ontario 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 Louisville-Ontario 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 Louisville to Ontario
Have a flexible travel schedule? Discover the best time to fly to Ontario from Louisville with our price prediction graph.
SDF-ONT
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.
Cheapflights Insights
Everything you need to know about your flight from Louisville to Ontario
What is the cheapest month to book a flight from Louisville to Ontario?
Currently, March is the cheapest month in which you can book a flight from Louisville to Ontario (average of $359). Flying from Louisville to Ontario in November is currently the most expensive (average of $656). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
How much does it cost to fly round-trip from Louisville to Ontario?
Airfare is below average for this route at the moment.
Louisville to Ontario flights typically cost between $447 and $507 in September.The cheapest round-trip price found within the last 5 days was $254 on Southwest (Sep 11-Sep 15).
Reviews of airlines servicing Ontario
Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated August 15, 2026.
Get a feel of what it's like to fly with Southwest and American Airlines from Louisville to Ontario by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Boarding
8.1
Overall
8.0
Entertainment
7.5
Comfort
8.0
Crew
8.6
Food
7.0
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Boarding
8.1
Overall
8.0
Entertainment
7.5
Comfort
8.0
Crew
8.6
Food
7.0
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Boarding
8.1
Overall
8.0
Entertainment
7.5
Comfort
8.0
Crew
8.6
Food
7.0
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Related info for your journey
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Top 2 airlines flying from Louisville to Ontario
Discover the top 2 airlines that operate flights from Louisville to Ontario. 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 2,558,603 searches. Data last updated August 15, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$324 | Average$424 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$331 | Average$482 | FlexibilityNo cancel fee | On-time63% |