Kentucky

$104+ Cheap flights from Ontario (ONT) to Kentucky

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 3/31. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SDF
Apr 17 — Apr 241
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Cheap flight deals from Ontario to Kentucky

Cheapest flights from Ontario to Kentucky
Explore the most affordable flight options available from Ontario to Kentucky. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 18, 2026.

This Expedia deal was found by Cheapflights users on 3/17. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/176:15 am
ONT
-
CVG
1 stop10h 08m
Frontier
Sun 4/198:38 pm
CVG
-
ONT
1 stop26h 26m
Frontier
Deal found 3/17$210
This Booking.com deal was found by Cheapflights users on 3/16. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/235:33 pm
ONT
-
CVG
1 stop22h 39m
Frontier
Thu 4/308:17 pm
CVG
-
ONT
1 stop6h 38m
Frontier
Deal found 3/16$217
This Mytrip deal was found by Cheapflights users on 3/13. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/2312:59 am
ONT
-
CVG
1 stop15h 13m
Frontier
Mon 4/278:38 pm
CVG
-
ONT
1 stop17h 06m
Frontier
Deal found 3/13$219
This CheapOair deal was found by Cheapflights users on 3/15. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/235:33 pm
ONT
-
CVG
1 stop22h 39m
Frontier
Mon 4/278:38 pm
CVG
-
ONT
1 stop17h 06m
Frontier
Deal found 3/15$221
This CheapOair deal was found by Cheapflights users on 3/12. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/86:00 am
ONT
-
TYS
1 stop10h 33m
Frontier
Fri 5/158:32 pm
TYS
-
ONT
1 stop16h 33m
Frontier
Deal found 3/12$221
This Gotogate deal was found by Cheapflights users on 3/15. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/235:33 pm
ONT
-
CVG
1 stop22h 39m
Frontier
Sun 4/268:38 pm
CVG
-
ONT
1 stop14h 46m
Frontier
Deal found 3/15$222
This Booking.com deal was found by Cheapflights users on 3/14. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/2312:59 am
ONT
-
CVG
1 stop15h 13m
Frontier
Sun 4/268:38 pm
CVG
-
ONT
1 stop14h 46m
Frontier
Deal found 3/14$223
This Frontier deal was found by Cheapflights users on 3/16. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/167:49 pm
ONT
-
CVG
1 stop7h 04m
Frontier
Mon 4/208:17 pm
CVG
-
ONT
1 stop6h 38m
Frontier
Deal found 3/16$230
This Booking.com deal was found by Cheapflights users on 3/13. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/1611:47 am
ONT
-
CVG
1 stop15h 06m
Frontier
Sun 4/198:38 pm
CVG
-
ONT
1 stop16h 36m
Frontier
Deal found 3/13$232
This Mytrip deal was found by Cheapflights users on 3/15. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/16:20 am
ONT
-
CVG
1 stop29h 02m
Frontier
Tue 4/77:20 am
CVG
-
ONT
1 stop19h 36m
Frontier
Deal found 3/15$240
This Kiwi.com deal was found by Cheapflights users on 3/13. 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.
Fri 5/18:20 pm
ONT
-
CVG
2 stops19h 16m
Frontier
Mon 5/49:29 pm
CVG
-
ONT
1 stop15h 36m
Frontier
Deal found 3/13$246
This Frontier deal was found by Cheapflights users on 3/15. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/56:00 am
ONT
-
BNA
1 stop10h 22m
Frontier
Tue 5/127:17 pm
BNA
-
ONT
1 stop6h 32m
Frontier
Deal found 3/15$250

Find flight deals from Ontario to Kentucky

Keep the following information in mind while searching for Ontario to Kentucky flight deals. Data was last updated March 18, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$210
(Expedia)

One-way from

$104
(Super.com)

Popular in

March

Cheapest in

June

Average price

$522
Provider with most accurate pricing for Los Angeles Los Angeles-Louisville Intl flight deals.
Provider most trusted by Cheapflights users for Los Angeles Los Angeles-Louisville Intl flights.
From Ontario to Kentucky
One-way flight from Ontario to Kentucky
Highest demand for flights based on searches. 25% potential increase in price ($123 potential increase over avg. RT price).
Cheapest flight prices on average. 4% potential price decrease ($16 potential savings vs. average RT price).
Average for round-trip flights in March 2026

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Kentucky 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 March 18, 2026.
Use the filters below to find and compare flights from Ontario to Kentucky that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

OntarioLouisville

ONT - SDF

ONTSDF

Ontario

Thu 5/7

11:55 pm-9:55 am

1 stop7h 00m

Louisville Intl

Sat 5/9

1:45 pm-8:15 pm

2 stops9h 30m

$338

OntarioLouisville

ONT - SDF

ONTSDF

Ontario

Mon 5/11

9:50 am-12:25 am

2 stops11h 35m

Louisville Intl

Sat 5/16

6:05 am-12:19 pm

2 stops9h 14m

$364

OntarioKnoxville

ONT - TYS

ONTTYS

Ontario

Sat 4/25

5:10 am-7:56 pm

2 stops11h 46m

Knoxville McGhee Tyson

Tue 5/5

5:55 pm-10:35 pm

1 stop7h 40m

$364

OntarioNashville

ONT - BNA

ONTBNA

Ontario

Fri 5/8

10:10 am-3:55 pm

Nonstop3h 45m

Nashville Intl

Mon 5/11

5:35 am-10:55 am

1 stop7h 20m

$367

OntarioLexington

ONT - LEX

ONTLEX

Ontario

Fri 5/29

12:07 pm-10:05 pm

1 stop6h 58m

Lexington Blue Grass

Fri 7/31

5:55 pm-10:09 pm

1 stop7h 14m

$369

OntarioNashville

ONT - BNA

ONTBNA

Ontario

Fri 5/1

9:55 pm-5:10 am

1 stop5h 15m

Nashville Intl

Sun 5/3

8:15 pm-12:05 am

1 stop5h 50m

$377

OntarioKnoxville

ONT - TYS

ONTTYS

Ontario

Sat 4/18

10:15 pm-9:22 am

1 stop8h 07m

Knoxville McGhee Tyson

Tue 4/21

4:38 pm-9:00 pm

1 stop7h 22m

$379

OntarioLouisville

ONT - SDF

ONTSDF

Ontario

Thu 5/7

12:40 pm-12:15 am

1 stop8h 35m

Louisville Intl

Fri 5/8

6:30 am-11:20 am

1 stop7h 50m

$395

OntarioNashville

ONT - BNA

ONTBNA

Ontario

Tue 5/5

6:59 pm-8:53 am

2 stops11h 54m

Nashville Intl

Sat 5/9

6:00 am-5:52 pm

2 stops13h 52m

$397

OntarioNashville

ONT - BNA

ONTBNA

Ontario

Sat 5/2

6:59 pm-8:53 am

2 stops11h 54m

Nashville Intl

Tue 5/5

8:40 am-8:36 pm

2 stops13h 56m

$397

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/15

Showing 1-10 of 60 resultsSorted by cheapest first
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Best time to book a flight from Ontario to Kentucky

Have a flexible travel schedule? Discover the best time to fly to Kentucky from Ontario with our price prediction graph.
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 Ontario to Kentucky

What is the cheapest month to book a flight from Ontario to Kentucky?

Currently, June is the cheapest month in which you can book a flight from Ontario to Kentucky (average of $67). Flying from Ontario to Kentucky in March is currently the most expensive (average of $304). 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.

Reviews of airlines servicing Kentucky

Get insights into the airlines that provide service to Kentucky. 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 Kentucky. Reviews last updated March 18, 2026.
Read through reviews of airlines operating flights from Ontario to Kentucky, such as Southwest,Delta, andUnited Airlines. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Boarding

8.1

Crew

8.6

Food

7.0

Comfort

8.0

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

Boarding

8.1

Crew

8.6

Food

7.0

Comfort

8.0

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

Boarding

8.1

Crew

8.6

Food

7.0

Comfort

8.0

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

Boarding

8.1

Crew

8.6

Food

7.0

Comfort

8.0

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

Boarding

8.1

Crew

8.6

Food

7.0

Comfort

8.0

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
10.0
Excellent

William Drew,Nov 2025

SJC - HNL

Flight crew was amazing! Usually they're very good on Southwest, but this crew went above and beyond. I have never ever seen so many rounds of drink service on a flight before.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Kentucky. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
  • What airport do you fly from for flights from Ontario to Kentucky?

    Ontario (ONT) is the airport you will fly out of if you book a flight from Ontario to Kentucky. It is only a 3.1 mi journey to Ontario (ONT) from Ontario’s city center.

  • How long is the flight from Ontario to Kentucky?

    United Airlines, Southwest, and American Airlines can get you from Ontario to Kentucky in just under 6h 03m. Your travel time can differ by up to 57m. There are 1791 mi between Ontario and Kentucky. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines to fly from Ontario to Kentucky one-way?

    To fly one-way, consider booking your trip with American Airlines, which is currently one of the cheapest options available, starting at $158. Southwest flights start at $160 while deals on United Airlines start at $195 one-way.

  • What are the most popular routes from Ontario to Kentucky?

  • Can I find deals for flights from Ontario to Kentucky that include hotel bookings?

    Yes. In addition to deals on Ontario to Kentucky flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Kentucky?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Kentucky.

  • Can I find deals for business class flights from Ontario to Kentucky?

    Yes. Cheapflights offers flight deals from Ontario to Kentucky by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Ontario to Kentucky?

    Currently, June is the cheapest month in which you can book a flight from Ontario to Kentucky (average of $67). Flying from Ontario to Kentucky in March is currently the most expensive (average of $304). 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.

See more FAQs

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Alternative routes for Ontario to Kentucky

See prices for flight routes from nearby airports that may be better suited for you.

Top 4 airlines flying from Ontario to Kentucky

Discover the top 4 airlines that operate flights from Ontario to Kentucky. 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 March 18, 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$238Average$450FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$288Average$465FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$320Average$443FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$342Average$446FlexibilityNo cancel feeOn-time63%

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