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Kentucky

$79+ 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 10/14. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SDF
Oct 14 — Oct 211
Tue 10/14
Tue 10/21
1 adult, Economy
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Cheap flight deals from Ontario to Kentucky

Keep the following information in mind while searching for Ontario to Kentucky flight deals. Data was last updated September 14, 2025.

Round-trip from

$150
(CheapOair)

One-way from

$79
(Trip.com)

Popular in

December

Cheapest in

July

Average price

$346
From Ontario to Kentucky
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One-way flight from Ontario to Kentucky
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Highest demand for flights based on searches. 27% potential increase in price ($135 potential increase over avg. RT price).
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Cheapest flight prices on average. 6% potential price decrease ($25 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find 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 September 14, 2025.

This CheapOair deal was found by Cheapflights users on 9/12. 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.
Thu 11/612:05 pmONT - CVG
1 stop10h 34mFrontier
Sat 11/88:00 amCVG - ONT
1 stop6h 10mFrontier
Deal found 9/12$150
This CheapOair deal was found by Cheapflights users on 9/13. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/1011:53 amONT - CVG
1 stop10h 56mFrontier
Sun 10/1212:01 pmCVG - ONT
1 stop8h 48mFrontier
Deal found 9/13$152
This CheapOair deal was found by Cheapflights users on 9/12. 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.
Thu 10/166:54 pmONT - CVG
1 stop9h 00mFrontier
Sun 10/191:08 pmCVG - ONT
1 stop23h 27mFrontier
Deal found 9/12$156
This CheapOair deal was found by Cheapflights users on 9/13. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/612:13 pmONT - CVG
1 stop6h 46mFrontier
Fri 10/109:10 pmCVG - ONT
1 stop26h 32mFrontier
Deal found 9/13$158
This Frontier deal was found by Cheapflights users on 9/14. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/96:53 amONT - CVG
1 stop7h 11mFrontier
Mon 10/206:05 amCVG - ONT
1 stop6h 30mFrontier
Deal found 9/14$160
This Frontier deal was found by Cheapflights users on 9/14. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/612:13 pmONT - CVG
1 stop6h 46mFrontier
Thu 10/1612:01 pmCVG - ONT
1 stop8h 53mFrontier
Deal found 9/14$162
This CheapOair deal was found by Cheapflights users on 9/12. 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.
Mon 9/294:08 pmONT - CVG
1 stop6h 32mFrontier
Thu 10/26:18 amCVG - ONT
1 stop28h 35mFrontier
Deal found 9/12$171
This Priceline deal was found by Cheapflights users on 9/13. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/612:13 pmONT - CVG
1 stop6h 46mFrontier
Thu 10/96:14 pmCVG - ONT
1 stop8h 36mFrontier
Deal found 9/13$173
This CheapOair deal was found by Cheapflights users on 9/12. 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.
Sat 9/208:59 pmONT - CVG
1 stop25h 41mFrontier
Mon 9/298:00 amCVG - ONT
1 stop15h 56mFrontier
Deal found 9/12$177
This Trip.com deal was found by Cheapflights users on 9/13. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/236:05 amONT - LEX
1 stop12h 38mMultiple Airlines
Sun 10/2610:33 pmLEX - ONT
1 stop26h 32mMultiple Airlines
Deal found 9/13$184
This CheapOair deal was found by Cheapflights users on 9/12. 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 10/2411:53 amONT - CVG
1 stop10h 56mFrontier
Mon 10/276:05 amCVG - ONT
1 stop6h 30mFrontier
Deal found 9/12$188
This Frontier deal was found by Cheapflights users on 9/12. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/206:53 amONT - CVG
1 stop9h 58mFrontier
Sun 10/266:05 amCVG - ONT
1 stop6h 30mFrontier
Deal found 9/12$192

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 September 14, 2025.
Use the filters below to find and compare flights from Ontario to Kentucky that are best for you.

Fly from

Ontario

Fly to

Kentucky

Route

Depart

Return

Price

OntarioCincinnati

ONT - CVG

ONTCVG

Ontario

Fri 10/24

11:53 am-1:49 am

1 stop10h 56m

Cincinnati Cinci./N. Kentucky

Sun 10/26

6:05 am-9:35 am

1 stop6h 30m

$150

OntarioCincinnati

ONT - CVG

ONTCVG

Ontario

Thu 10/23

6:53 am-1:39 am

1 stop15h 46m

Cincinnati Cinci./N. Kentucky

Sun 10/26

6:05 am-9:35 am

1 stop6h 30m

$150

OntarioCincinnati

ONT - CVG

ONTCVG

Ontario

Mon 10/6

12:13 pm-9:59 pm

1 stop6h 46m

Cincinnati Cinci./N. Kentucky

Thu 10/16

12:01 pm-5:54 pm

1 stop8h 53m

$162

OntarioCincinnati

ONT - CVG

ONTCVG

Ontario

Mon 10/20

6:53 am-1:39 am

1 stop15h 46m

Cincinnati Cinci./N. Kentucky

Fri 10/24

9:10 pm-8:42 pm

1 stop26h 32m

$199

OntarioCincinnati

ONT - CVG

ONTCVG

Ontario

Sun 10/5

8:59 pm-12:19 pm

1 stop12h 20m

Cincinnati Cinci./N. Kentucky

Mon 10/20

6:05 am-9:35 am

1 stop6h 30m

$201

OntarioCincinnati

ONT - CVG

ONTCVG

Ontario

Wed 9/17

8:59 pm-1:40 am

1 stop25h 41m

Cincinnati Cinci./N. Kentucky

Tue 9/30

8:00 am-7:54 pm

1 stop14h 54m

$202

OntarioCincinnati

ONT - CVG

ONTCVG

Ontario

Fri 10/3

8:59 pm-10:41 pm

1 stop22h 42m

Cincinnati Cinci./N. Kentucky

Wed 10/8

8:00 am-11:50 pm

1 stop18h 50m

$225

OntarioCincinnati

ONT - CVG

ONTCVG

Ontario

Fri 10/3

12:13 pm-10:02 pm

1 stop6h 49m

Cincinnati Cinci./N. Kentucky

Fri 10/10

1:08 pm-7:49 am

2 stops21h 41m

$229

OntarioCincinnati

ONT - CVG

ONTCVG

Ontario

Mon 10/6

12:13 pm-1:56 pm

2 stops46h 43m

Cincinnati Cinci./N. Kentucky

Thu 10/9

5:59 pm-7:49 am

1 stop16h 50m

$254

OntarioNashville

ONT - BNA

ONTBNA

Ontario

Wed 11/12

1:20 pm-10:02 pm

1 stop6h 42m

Nashville Intl

Wed 11/19

5:15 am-10:40 am

1 stop7h 25m

$257

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/12

Showing 1-10 of 60 results
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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, January is the cheapest month in which you can book a flight from Ontario to Kentucky (average of $299). Flying from Ontario to Kentucky in April is currently the most expensive (average of $369). 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.

What is the cheapest time of day to fly from ONT to KY?

Find hourly flight availability from Ontario to Kentucky. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 14, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ontario to Kentucky as you normally would.

Weekly flight availability from Ontario to Kentucky

Explore weekly flight availability from Ontario to Kentucky. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated September 14, 2025.

The most flights from ONT to USKY are scheduled on a Monday (1 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (1 on average).

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 September 14, 2025.
Read through reviews of airlines operating flights from Ontario to Kentucky, such as Southwest, Delta, and United Airlines. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,245 reviews

Comfort

8.0

Food

7.0

Crew

8.6

Overall

8.0

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,245 reviews
Southwest
8.0
Very good
4,245 reviews

Comfort

8.0

Food

7.0

Crew

8.6

Overall

8.0

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Delta
8.0
Very good
7,956 reviews
Southwest
8.0
Very good
4,245 reviews

Comfort

8.0

Food

7.0

Crew

8.6

Overall

8.0

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
United Airlines
7.4
Good
8,931 reviews
Southwest
8.0
Very good
4,245 reviews

Comfort

8.0

Food

7.0

Crew

8.6

Overall

8.0

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,245 reviews

Comfort

8.0

Food

7.0

Crew

8.6

Overall

8.0

Boarding

8.1

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

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?

    Frontier, Delta, and American Airlines can get you from Ontario to Kentucky in just under 6h 32m. Your travel time can differ by up to 4h 24m. There are 1897 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 Frontier, which is currently one of the cheapest options available, starting at $81. United Airlines flights start at $92 while deals on Southwest start at $105 one-way.

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

    The most popular flight routes from Ontario to Kentucky are Ontario - Nashville Intl, Ontario - Cincinnati Cinci./N. Kentucky and Ontario - Knoxville McGhee Tyson.

  • 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, January is the cheapest month in which you can book a flight from Ontario to Kentucky (average of $299). Flying from Ontario to Kentucky in April is currently the most expensive (average of $369). 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.
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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 September 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$248Average$481FlexibilityNo cancel feeOn-time71%
DeltaCheapest$288Average$421FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$342Average$476FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$378Average$556FlexibilityNo cancel feeOn-time69%

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