$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 8/31. Fares are subject to change and may not be available on all flights or dates of travel.
SDF — ONT
Jul 8 — Jul 151
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
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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 June 8, 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 June 8, 2026.
This Delta deal was found by Cheapflights users on 6/3. 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 9/17:05 am
SDF
- ONT
1 stop6h 37m
Delta
Tue 9/812:00 pm
ONT
- SDF
1 stop8h 59m
Delta
Deal found 6/3![Delta logo]()
$351
This United Airlines deal was found by Cheapflights users on 6/5. 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 7/15:50 pm
SDF
- ONT
1 stop8h 01m
United Airlines
Sat 7/46:10 am
ONT
- SDF
1 stop7h 53m
United Airlines
Deal found 6/5![United Airlines logo]()
$356
This Delta deal was found by Cheapflights users on 6/8. 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 6/307:05 am
SDF
- ONT
1 stop6h 35m
Delta
Fri 7/311:50 am
ONT
- SDF
1 stop9h 42m
Delta
Deal found 6/8![Delta logo]()
$361
This Delta deal was found by Cheapflights users on 6/5. 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 10/37:05 am
SDF
- ONT
1 stop6h 42m
Delta
Wed 10/712:00 pm
ONT
- SDF
1 stop7h 35m
Delta
Deal found 6/5![Delta logo]()
$366
This Southwest deal was found by Cheapflights users on 6/5. 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 7/111:45 am
SDF
- ONT
1 stop11h 35m
Southwest
Sat 7/45:25 am
ONT
- SDF
2 stops7h 15m
Southwest
Deal found 6/5![Southwest logo]()
$367
This Delta deal was found by Cheapflights users on 6/8. 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 6/301:02 pm
SDF
- ONT
1 stop8h 28m
Delta
Wed 7/811:48 am
ONT
- SDF
1 stop9h 38m
Delta
Deal found 6/8![Delta logo]()
$381
This Delta deal was found by Cheapflights users on 6/5. 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 8/276:00 am
SDF
- ONT
1 stop7h 42m
Delta
Mon 8/317:05 am
ONT
- SDF
1 stop9h 25m
Delta
Deal found 6/5![Delta logo]()
$391
This Southwest deal was found by Cheapflights users on 6/7. 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 7/155:35 am
SDF
- ONT
1 stop9h 30m
Southwest
Wed 7/2211:30 am
ONT
- SDF
1 stop7h 15m
Southwest
Deal found 6/7![Southwest logo]()
$401
This Delta deal was found by Cheapflights users on 6/3. 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 9/17:05 am
SDF
- ONT
1 stop6h 37m
Delta
Fri 9/412:00 pm
ONT
- SDF
1 stop7h 08m
Delta
Deal found 6/3![Delta logo]()
$404
This Delta deal was found by Cheapflights users on 6/8. 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 6/301:02 pm
SDF
- ONT
1 stop8h 28m
Delta
Thu 7/910:00 pm
ONT
- SDF
1 stop7h 54m
Delta
Deal found 6/8![Delta logo]()
$409
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 June 8, 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 June 8, 2026.
This Southwest deal was found by Cheapflights users on 6/7. 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 7/155:25 pm
SDF
- ONT
2 stops7h 55m
Southwest
Wed 7/229:45 am
ONT
- SDF
2 stops9h 00m
Southwest
Deal found 6/7![Southwest logo]()
$411
This Delta deal was found by Cheapflights users on 6/8. 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 10/1012:53 pm
SDF
- ONT
1 stop8h 25m
Delta
Mon 10/1210:59 pm
ONT
- SDF
1 stop7h 55m
Delta
Deal found 6/8![Delta logo]()
$429
This United Airlines deal was found by Cheapflights users on 6/5. 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.
Thu 8/278:00 am
SDF
- ONT
1 stop7h 50m
United Airlines
Mon 8/317:13 pm
ONT
- SDF
2 stops11h 29m
United Airlines
Deal found 6/5![United Airlines logo]()
$486
This Southwest deal was found by Cheapflights users on 6/6. 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 7/1612:35 pm
SDF
- ONT
1 stop5h 30m
Southwest
Sat 8/13:00 pm
ONT
- SDF
1 stop7h 25m
Southwest
Deal found 6/6![Southwest logo]()
$424
This Delta deal was found by Cheapflights users on 6/5. 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 8/286:00 am
SDF
- ONT
1 stop7h 42m
Delta
Mon 8/317:05 am
ONT
- SDF
1 stop9h 25m
Delta
Deal found 6/5![Delta logo]()
$429
This Delta deal was found by Cheapflights users on 6/6. 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 9/237:05 am
SDF
- ONT
1 stop6h 42m
Delta
Sun 9/2710:00 pm
ONT
- SDF
1 stop7h 53m
Delta
Deal found 6/6![Delta logo]()
$439
This United Airlines deal was found by Cheapflights users on 6/5. 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 8/283:25 pm
SDF
- ONT
1 stop8h 28m
United Airlines
Mon 8/317:13 pm
ONT
- SDF
2 stops11h 29m
United Airlines
Deal found 6/5![United Airlines logo]()
$524
This Delta deal was found by Cheapflights users on 6/7. 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.
Sun 8/27:05 am
SDF
- ONT
1 stop6h 33m
Delta
Sat 8/812:00 pm
ONT
- SDF
1 stop7h 05m
Delta
Deal found 6/7![Delta logo]()
$455
This United Airlines deal was found by Cheapflights users on 6/4. 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 7/13:41 pm
SDF
- ONT
1 stop9h 14m
United Airlines
Fri 7/36:10 am
ONT
- SDF
2 stops13h 40m
United Airlines
Deal found 6/4![United Airlines logo]()
$539
This Delta deal was found by Cheapflights users on 6/5. 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 8/287:05 am
SDF
- ONT
1 stop6h 37m
Delta
Sun 8/3010:00 pm
ONT
- SDF
1 stop9h 32m
Delta
Deal found 6/5![Delta logo]()
$497
This United Airlines deal was found by Cheapflights users on 6/3. 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 8/105:50 pm
SDF
- ONT
1 stop8h 01m
United Airlines
Tue 8/185:00 am
ONT
- SDF
2 stops11h 07m
United Airlines
Deal found 6/3![United Airlines logo]()
$554
This Delta deal was found by Cheapflights users on 6/4. 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 7/227:05 am
SDF
- ONT
1 stop6h 33m
Delta
Sat 7/257:05 am
ONT
- SDF
1 stop7h 10m
Delta
Deal found 6/4![Delta logo]()
$515
Last-minute flights from Louisville to OntarioDiscover last-minute flight deals from Louisville to Ontario. Data last updated June 8, 2026 and is based on user searches.
Discover last-minute flight deals from Louisville to Ontario. Data last updated June 8, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 6/8. 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 6/307:05 am
SDF
- ONT
1 stop6h 35m
Delta
Fri 7/311:50 am
ONT
- SDF
1 stop9h 42m
Delta
Deal found 6/8![Delta logo]()
$361
This Delta deal was found by Cheapflights users on 6/8. 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 6/301:02 pm
SDF
- ONT
1 stop8h 28m
Delta
Wed 7/811:48 am
ONT
- SDF
1 stop9h 38m
Delta
Deal found 6/8![Delta logo]()
$381
This Delta deal was found by Cheapflights users on 6/8. 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 6/301:02 pm
SDF
- ONT
1 stop8h 28m
Delta
Thu 7/910:00 pm
ONT
- SDF
1 stop7h 54m
Delta
Deal found 6/8![Delta logo]()
$409
This United Airlines deal was found by Cheapflights users on 6/5. 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 7/15:50 pm
SDF
- ONT
1 stop8h 01m
United Airlines
Sat 7/46:10 am
ONT
- SDF
1 stop7h 53m
United Airlines
Deal found 6/5![United Airlines logo]()
$356
This Southwest deal was found by Cheapflights users on 6/5. 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 7/111:45 am
SDF
- ONT
1 stop11h 35m
Southwest
Sat 7/45:25 am
ONT
- SDF
2 stops7h 15m
Southwest
Deal found 6/5![Southwest logo]()
$367
This Delta deal was found by Cheapflights users on 6/4. 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 7/31:02 pm
SDF
- ONT
1 stop8h 28m
Delta
Fri 7/1010:00 pm
ONT
- SDF
1 stop9h 29m
Delta
Deal found 6/4![Delta logo]()
$414
This Southwest deal was found by Cheapflights users on 6/4. 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 7/312:35 pm
SDF
- ONT
1 stop5h 30m
Southwest
Wed 7/151:20 pm
ONT
- SDF
1 stop8h 00m
Southwest
Deal found 6/4![Southwest logo]()
$429
This Southwest deal was found by Cheapflights users on 6/7. 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 7/155:35 am
SDF
- ONT
1 stop9h 30m
Southwest
Wed 7/2211:30 am
ONT
- SDF
1 stop7h 15m
Southwest
Deal found 6/7![Southwest logo]()
$401
This Southwest deal was found by Cheapflights users on 6/6. 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 7/1612:35 pm
SDF
- ONT
1 stop5h 30m
Southwest
Sat 8/13:00 pm
ONT
- SDF
1 stop7h 25m
Southwest
Deal found 6/6![Southwest logo]()
$424
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 June 8, 2026.
Search for one-way flight options from Louisville to Ontario. Find affordable one-way fares based on user searches. Data last updated June 8, 2026.
This Kiwi.com deal was found by Cheapflights users on 6/4. 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.
Mon 8/319:31 am
SDF
- ONT
1 stop30h 11m
Multiple Airlines
Deal found 6/4![Multiple Airlines logo]()
$139
This United Airlines deal was found by Cheapflights users on 6/8. 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 7/15:50 pm
SDF
- ONT
1 stop8h 01m
United Airlines
Deal found 6/8![United Airlines logo]()
$181
This Southwest deal was found by Cheapflights users on 6/4. 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.
Mon 8/316:45 am
SDF
- ONT
2 stops7h 40m
Southwest
Deal found 6/4![Southwest logo]()
$196
This Kiwi.com deal was found by Cheapflights users on 6/7. 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.
Sun 8/211:13 am
SDF
- ONT
3 stops39h 37m
Multiple Airlines
Deal found 6/7![Multiple Airlines logo]()
$198
This Southwest deal was found by Cheapflights users on 6/7. 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.
Tue 9/84:00 pm
SDF
- ONT
1 stop5h 55m
Southwest
Deal found 6/7![Southwest logo]()
$201
This United Airlines deal was found by Cheapflights users on 6/4. 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 8/193:25 pm
SDF
- ONT
1 stop8h 28m
United Airlines
Deal found 6/4![United Airlines logo]()
$226
This Southwest deal was found by Cheapflights users on 6/4. 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 7/810:55 am
SDF
- ONT
1 stop6h 10m
Southwest
Deal found 6/4![Southwest logo]()
$229
This Southwest deal was found by Cheapflights users on 6/7. 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.
Sun 8/25:30 pm
SDF
- ONT
2 stops9h 15m
Southwest
Deal found 6/7![Southwest logo]()
$234
This Southwest deal was found by Cheapflights users on 6/5. 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 6/255:05 pm
SDF
- ONT
1 stop8h 20m
Southwest
Deal found 6/5![Southwest logo]()
$259
This Southwest deal was found by Cheapflights users on 6/8. 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 7/11:00 pm
SDF
- ONT
2 stops11h 15m
Southwest
Deal found 6/8![Southwest logo]()
$264
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 June 8, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $351 (Delta) |
One-way from | $139 (Kiwi.com) |
Popular in | December |
Cheapest in | October |
Average price | $448 |
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 June 8, 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
LouisvilleOntario
SDF - ONT
SDFONT
Louisville Intl
Wed 7/15
5:25 pm-10:20 pm
2 stops7h 55m
Ontario
Wed 7/22
9:45 am-9:45 pm
2 stops9h 00m
$411
Quickest round-trip
LouisvilleOntario
SDF - ONT
SDFONT
Louisville Intl
Thu 7/16
12:35 pm-3:05 pm
1 stop5h 30m
Ontario
Sat 8/1
3:00 pm-1:25 am
1 stop7h 25m
$424
LouisvilleOntario
SDF - ONT
SDFONT
Louisville Intl
Sat 10/10
12:53 pm-6:18 pm
1 stop8h 25m
Ontario
Mon 10/12
10:59 pm-9:54 am
1 stop7h 55m
$429
LouisvilleOntario
SDF - ONT
SDFONT
Louisville Intl
Fri 8/28
6:00 am-10:42 am
1 stop7h 42m
Ontario
Mon 8/31
7:05 am-7:30 pm
1 stop9h 25m
$429
LouisvilleOntario
SDF - ONT
SDFONT
Louisville Intl
Wed 9/23
7:05 am-10:47 am
1 stop6h 42m
Ontario
Sun 9/27
10:00 pm-8:53 am
1 stop7h 53m
$439
LouisvilleOntario
SDF - ONT
SDFONT
Louisville Intl
Sun 8/2
7:05 am-10:38 am
1 stop6h 33m
Ontario
Sat 8/8
12:00 pm-10:05 pm
1 stop7h 05m
$455
LouisvilleOntario
SDF - ONT
SDFONT
Louisville Intl
Thu 8/27
8:00 am-12:50 pm
1 stop7h 50m
Ontario
Mon 8/31
7:13 pm-9:42 am
2 stops11h 29m
$486
LouisvilleOntario
SDF - ONT
SDFONT
Louisville Intl
Fri 8/28
7:05 am-10:42 am
1 stop6h 37m
Ontario
Sun 8/30
10:00 pm-10:32 am
1 stop9h 32m
$497
LouisvilleOntario
SDF - ONT
SDFONT
Louisville Intl
Wed 7/22
7:05 am-10:38 am
1 stop6h 33m
Ontario
Sat 7/25
7:05 am-5:15 pm
1 stop7h 10m
$515
LouisvilleOntario
SDF - ONT
SDFONT
Louisville Intl
Fri 8/28
3:25 pm-8:53 pm
1 stop8h 28m
Ontario
Mon 8/31
7:13 pm-9:42 am
2 stops11h 29m
$524
Showing 1-10 of 22 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 June.
| 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
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 June 8, 2026.
Get a feel of what it's like to fly with Southwest,United Airlines, andAmerican 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.
Overall
7.9
Boarding
8.1
Entertainment
7.5
Comfort
8.0
Crew
8.6
Food
7.0
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Overall
7.9
Boarding
8.1
Entertainment
7.5
Comfort
8.0
Crew
8.6
Food
7.0
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Overall
7.9
Boarding
8.1
Entertainment
7.5
Comfort
8.0
Crew
8.6
Food
7.0
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Overall
7.9
Boarding
8.1
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
Find useful and relevant information for your journey from Louisville to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Alternative routes for Louisville to Ontario
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Complete your trip
Complete your trip to Ontario by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Louisville to Ontario by cabin class
Find flights from Louisville to Ontario, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Other flights to Ontario
Explore flights to Ontario departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on June 8, 2026.
Louisville and Ontario flights
Browse other Louisville and Ontario flight options. Last updated on June 8, 2026.
Other flights from Louisville
Browse through other flights departing from Louisville. Flights are based on user searches made on Cheapflights and were last updated on June 8, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 3 airlines flying from Louisville to Ontario
Discover the top 3 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 June 8, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$268 | Average$434 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$306 | Average$447 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$337 | Average$607 | FlexibilityNo cancel fee | On-time69% |