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Kentucky

$74+ 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 1/14. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SDF
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
1 adult, Economy
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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 December 18, 2025.

This CheapOair deal was found by Cheapflights users on 12/16. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/296:00 amONT - CVG
1 stop10h 10mFrontier
Sun 1/48:20 pmCVG - ONT
1 stop23h 55mFrontier
Deal found 12/16$235
This CheapOair deal was found by Cheapflights users on 12/16. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/286:00 amONT - CVG
1 stop10h 10mFrontier
Sun 1/48:20 pmCVG - ONT
1 stop23h 55mFrontier
Deal found 12/16$259
This Trip.com deal was found by Cheapflights users on 12/15. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/226:00 amONT - CVG
1 stop10h 10mFrontier
Sat 1/39:30 pmCVG - ONT
1 stop26h 57mFrontier
Deal found 12/15$281
This Frontier deal was found by Cheapflights users on 12/16. 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.
Fri 12/266:00 amONT - CVG
1 stop10h 10mFrontier
Thu 1/17:16 pmCVG - ONT
1 stop7h 43mFrontier
Deal found 12/16$282
This Gotogate deal was found by Cheapflights users on 12/16. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/205:16 pmONT - CVG
1 stop22h 54mFrontier
Mon 12/228:20 pmCVG - ONT
1 stop27h 57mFrontier
Deal found 12/16$284
This CheapOair deal was found by Cheapflights users on 12/16. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/206:00 amONT - CVG
1 stop11h 30mFrontier
Fri 1/28:20 pmCVG - ONT
1 stop23h 11mFrontier
Deal found 12/16$289
This Booking.com deal was found by Cheapflights users on 12/15. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/256:07 pmONT - CVG
1 stop22h 03mFrontier
Fri 1/21:20 pmCVG - ONT
1 stop13h 39mFrontier
Deal found 12/15$302
This Travelocity deal was found by Cheapflights users on 12/17. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/246:45 amONT - CVG
1 stop27h 28mFrontier
Thu 1/17:16 pmCVG - ONT
1 stop7h 43mFrontier
Deal found 12/17$304
This Delta deal was found by Cheapflights users on 12/16. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/246:00 amONT - CVG
1 stop6h 00mDelta
Thu 1/16:00 amCVG - ONT
1 stop7h 00mDelta
Deal found 12/16$307
This CheapOair deal was found by Cheapflights users on 12/15. 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.
Sat 12/275:16 pmONT - CVG
1 stop22h 54mFrontier
Fri 1/21:20 pmCVG - ONT
1 stop13h 39mFrontier
Deal found 12/15$313
This Frontier deal was found by Cheapflights users on 12/16. 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.
Wed 12/246:45 amONT - BNA
1 stop9h 22mFrontier
Mon 12/297:02 pmBNA - ONT
1 stop6h 57mFrontier
Deal found 12/16$363
This Frontier deal was found by Cheapflights users on 12/16. 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.
Fri 12/196:45 amONT - BNA
1 stop9h 22mFrontier
Wed 12/317:02 pmBNA - ONT
1 stop6h 57mFrontier
Deal found 12/16$397

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 December 18, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$182
(Frontier)

One-way from

$74
(Kiwi.com)

Popular in

December

Cheapest in

July

Average price

$496
Provider with most accurate pricing for Los Angeles-Louisville Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Los Angeles-Louisville Intl flights.
Search Deals
From Ontario to Kentucky
Search Deals
One-way flight from Ontario to Kentucky
Search Deals
Highest demand for flights based on searches. 22% potential increase in price ($104 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($13 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

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 December 18, 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

Thu 1/29

11:04 am-11:58 pm

1 stop9h 54m

Cincinnati Cinci./N. Kentucky

Mon 2/2

2:11 pm-7:10 pm

1 stop7h 59m

$182

OntarioCincinnati

ONT - CVG

ONTCVG

Ontario

Wed 12/31

6:45 am-1:13 pm

1 stop27h 28m

Cincinnati Cinci./N. Kentucky

Sun 1/4

8:20 pm-5:15 pm

1 stop23h 55m

$196

OntarioCincinnati

ONT - CVG

ONTCVG

Ontario

Thu 1/22

6:20 am-8:48 pm

1 stop11h 28m

Cincinnati Cinci./N. Kentucky

Fri 1/23

2:10 pm-7:53 pm

1 stop8h 43m

$217

OntarioCincinnati

ONT - CVG

ONTCVG

Ontario

Fri 1/23

2:28 pm-11:57 pm

1 stop6h 29m

Cincinnati Cinci./N. Kentucky

Mon 1/26

2:11 pm-7:10 pm

1 stop7h 59m

$217

OntarioCincinnati

ONT - CVG

ONTCVG

Ontario

Thu 1/22

6:20 am-8:48 pm

1 stop11h 28m

Cincinnati Cinci./N. Kentucky

Sun 1/25

2:10 pm-7:32 pm

1 stop8h 22m

$217

OntarioKnoxville

ONT - TYS

ONTTYS

Ontario

Thu 1/8

6:00 am-3:28 pm

1 stop6h 28m

Knoxville McGhee Tyson

Sun 1/11

4:23 pm-11:56 pm

1 stop10h 33m

$217

OntarioCincinnati

ONT - CVG

ONTCVG

Ontario

Thu 1/15

10:18 pm-12:29 am

1 stop23h 11m

Cincinnati Cinci./N. Kentucky

Sun 1/18

3:09 pm-7:37 am

1 stop19h 28m

$218

OntarioCincinnati

ONT - CVG

ONTCVG

Ontario

Tue 1/6

4:04 pm-2:39 pm

2 stops19h 35m

Cincinnati Cinci./N. Kentucky

Thu 1/8

2:18 pm-7:22 pm

1 stop8h 04m

$219

OntarioKnoxville

ONT - TYS

ONTTYS

Ontario

Thu 1/8

6:00 am-3:28 pm

1 stop6h 28m

Knoxville McGhee Tyson

Thu 1/15

8:18 pm-11:59 pm

1 stop6h 41m

$233

OntarioCincinnati

ONT - CVG

ONTCVG

Ontario

Wed 1/14

5:05 am-7:03 pm

2 stops10h 58m

Cincinnati Cinci./N. Kentucky

Wed 1/21

2:08 pm-9:58 pm

2 stops10h 50m

$267

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/17

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, June is the cheapest month in which you can book a flight from Ontario to Kentucky (average of $71). Flying from Ontario to Kentucky in March is currently the most expensive (average of $322). 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 December 18, 2025.

It’s optimal to fly from Ontario to Kentucky in the evening. By choosing this option you can save up to 20% on the cost of your flight, compared to a flight in the afternoon.

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 December 18, 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
7.9
Good
4,250 reviews

Crew

8.6

Boarding

8.1

Entertainment

7.5

Overall

7.9

Food

7.0

Comfort

8.0

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.
Southwest
7.9
Good
4,250 reviews
Southwest
7.9
Good
4,250 reviews

Crew

8.6

Boarding

8.1

Entertainment

7.5

Overall

7.9

Food

7.0

Comfort

8.0

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.
Delta
7.9
Good
8,005 reviews
Southwest
7.9
Good
4,250 reviews

Crew

8.6

Boarding

8.1

Entertainment

7.5

Overall

7.9

Food

7.0

Comfort

8.0

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.
United Airlines
7.4
Good
9,091 reviews
Southwest
7.9
Good
4,250 reviews

Crew

8.6

Boarding

8.1

Entertainment

7.5

Overall

7.9

Food

7.0

Comfort

8.0

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.
American Airlines
7.2
Good
11,054 reviews
Southwest
7.9
Good
4,250 reviews

Crew

8.6

Boarding

8.1

Entertainment

7.5

Overall

7.9

Food

7.0

Comfort

8.0

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?

    Frontier, Delta, and United Airlines can get you from Ontario to Kentucky in just under 8h 42m. Your travel time can differ by up to 1h 12m. There are 1745 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 Delta, which is currently one of the cheapest options available, starting at $143. American Airlines flights start at $158 while deals on Southwest start at $189 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 - Louisville Intl.

  • 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 $71). Flying from Ontario to Kentucky in March is currently the most expensive (average of $322). 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 December 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$288Average$420FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$288Average$467FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$342Average$456FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$343Average$477FlexibilityNo cancel feeOn-time69%

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