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$81+ Cheap flights from Kentucky to Ontario (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 10/24. Fares are subject to change and may not be available on all flights or dates of travel.
SDF — ONT
Oct 24 — Oct 311
Fri 10/24
Fri 10/31
1 adult, Economy
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Cheap flight deals from Kentucky to Ontario

Keep the following information in mind while searching for Kentucky to Ontario flight deals. Data was last updated September 24, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$145
(CheapOair)

One-way from

$81
(Cheapflightsfares)

Popular in

April

Cheapest in

July

Average price

$303
Provider with most accurate pricing for Louisville Intl-Los Angeles flight deals.
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Provider most trusted by Cheapflights users for Louisville Intl-Los Angeles flights.
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From Kentucky to Ontario
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One-way flight from Kentucky to Ontario
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Highest demand for flights based on searches. 12% potential increase in price ($47 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($16 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 Kentucky to Ontario

Cheapest flights from Kentucky to Ontario
Explore the most affordable flight options available from Kentucky to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 24, 2025.

This Priceline deal was found by Cheapflights users on 9/23. 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.
Thu 11/133:42 pmBNA - ONT
1 stop10h 08mFrontier
Mon 11/176:53 amONT - BNA
1 stop5h 54mFrontier
Deal found 9/23$145
This Cheapflightsfares deal was found by Cheapflights users on 9/24. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/246:05 amCVG - ONT
1 stop6h 30mFrontier
Fri 10/314:05 pmONT - CVG
1 stop6h 34mFrontier
Deal found 9/24$149
This Frontier deal was found by Cheapflights users on 9/23. 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 10/236:05 amCVG - ONT
1 stop6h 30mFrontier
Thu 10/3012:05 pmONT - CVG
1 stop10h 34mFrontier
Deal found 9/23$150
This Booking.com deal was found by Cheapflights users on 9/23. 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.
Sat 10/188:00 amCVG - ONT
1 stop18h 50mFrontier
Sun 10/196:53 amONT - CVG
1 stop15h 46mFrontier
Deal found 9/23$151
This Frontier deal was found by Cheapflights users on 9/24. 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 11/612:01 pmCVG - ONT
1 stop9h 48mFrontier
Mon 11/104:05 pmONT - CVG
1 stop6h 34mFrontier
Deal found 9/24$152
This Booking.com deal was found by Cheapflights users on 9/23. 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.
Wed 10/158:00 amCVG - ONT
1 stop18h 50mFrontier
Fri 10/178:34 amONT - CVG
1 stop12h 25mFrontier
Deal found 9/23$153
This Booking.com deal was found by Cheapflights users on 9/22. 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.
Tue 9/308:00 amCVG - ONT
1 stop14h 54mFrontier
Tue 10/77:04 amONT - CVG
1 stop13h 55mFrontier
Deal found 9/22$157
This Booking.com deal was found by Cheapflights users on 9/24. 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.
Tue 10/78:00 amCVG - ONT
1 stop18h 50mFrontier
Thu 10/98:34 amONT - CVG
1 stop12h 25mFrontier
Deal found 9/24$159
This Frontier deal was found by Cheapflights users on 9/23. 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 10/23:21 pmCVG - ONT
1 stop7h 33mFrontier
Mon 10/612:13 pmONT - CVG
1 stop6h 46mFrontier
Deal found 9/23$162
This Booking.com deal was found by Cheapflights users on 9/24. 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.
Fri 10/179:10 pmCVG - ONT
1 stop26h 32mFrontier
Sun 10/196:53 amONT - CVG
1 stop15h 46mFrontier
Deal found 9/24$163
This CheapOair deal was found by Cheapflights users on 9/22. 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 10/39:38 pmBNA - ONT
1 stop24h 16mFrontier
Wed 10/156:53 amONT - BNA
1 stop15h 06mFrontier
Deal found 9/22$169
This Priceline deal was found by Cheapflights users on 9/24. 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.
Fri 10/246:05 amCVG - ONT
1 stop6h 30mFrontier
Fri 11/77:44 pmONT - CVG
1 stop8h 10mFrontier
Deal found 9/24$171

Cheapflights Fare Finder

 
Customize your flight search to find flights from Kentucky 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 September 24, 2025.
Use the filters below to find and compare flights from Kentucky to Ontario that are best for you.

Fly from

Kentucky

Fly to

Ontario

Route

Depart

Return

Price

CincinnatiOntario

CVG - ONT

CVGONT

Cincinnati Cinci./N. Kentucky

Fri 11/7

1:27 pm-11:10 am

1 stop24h 43m

Ontario

Tue 11/11

8:45 am-10:08 pm

1 stop10h 23m

$151

CincinnatiOntario

CVG - ONT

CVGONT

Cincinnati Cinci./N. Kentucky

Thu 10/30

9:30 pm-7:17 am

1 stop12h 47m

Ontario

Wed 11/5

8:45 am-10:08 pm

1 stop10h 23m

$162

CincinnatiOntario

CVG - ONT

CVGONT

Cincinnati Cinci./N. Kentucky

Fri 10/17

9:10 pm-8:42 pm

1 stop26h 32m

Ontario

Sun 10/19

6:53 am-1:39 am

1 stop15h 46m

$163

NashvilleOntario

BNA - ONT

BNAONT

Nashville Intl

Thu 10/16

6:12 am-11:50 pm

1 stop19h 38m

Ontario

Wed 10/22

6:53 am-11:59 pm

1 stop15h 06m

$176

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Fri 10/17

8:17 pm-11:50 pm

1 stop6h 33m

Ontario

Mon 10/27

6:53 am-7:32 pm

1 stop9h 39m

$191

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Fri 10/17

8:17 pm-11:50 pm

1 stop6h 33m

Ontario

Sun 10/26

6:53 am-7:32 pm

1 stop9h 39m

$191

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Fri 10/17

8:17 pm-11:50 pm

1 stop6h 33m

Ontario

Mon 10/20

6:53 am-7:32 pm

1 stop9h 39m

$222

NashvilleOntario

BNA - ONT

BNAONT

Nashville Intl

Sat 9/27

7:00 am-7:54 pm

1 stop14h 54m

Ontario

Tue 10/7

7:04 am-11:59 pm

1 stop14h 55m

$229

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Thu 10/23

8:17 pm-11:50 pm

1 stop6h 33m

Ontario

Thu 10/30

6:53 am-6:22 pm

1 stop8h 29m

$267

CincinnatiOntario

CVG - ONT

CVGONT

Cincinnati Cinci./N. Kentucky

Wed 10/22

6:49 pm-12:03 am

1 stop8h 14m

Ontario

Tue 10/28

4:11 pm-5:30 pm

1 stop22h 19m

$270

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/23

Showing 1-10 of 60 results
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Best time to book a flight from Kentucky to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Kentucky 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 Kentucky to Ontario

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

Currently, August is the cheapest month in which you can book a flight from Kentucky to Ontario (average of $246). Flying from Kentucky to Ontario in March is currently the most expensive (average of $328). 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 KY to ONT?

Find hourly flight availability from Kentucky to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 24, 2025.

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

Related info for your journey

Find useful and relevant information for your journey from Kentucky to Ontario. 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 into for flights to Ontario from Kentucky?

    Ontario (ONT), located 3.1 mi from the city center, is the airport you fly into when you book flights from Kentucky to Ontario.

  • How long is the flight from Kentucky to Ontario?

    Departing from Kentucky to Ontario will take you 6h 36m. Kentucky and Ontario are separated by a distance of 1745 mi. This flight may include one or multiple stops.

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

    $138 is the cheapest one-way deal found within the past few days, from Alaska Airlines. You may also be able to find cheap deals on United Airlines and Delta, with prices starting from $143 and $143, respectively.

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

    While some choose either Cincinnati Cinci./N. Kentucky - Ontario or Louisville Intl - Ontario, Nashville Intl - Ontario is the most popular route from Kentucky to Ontario.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Kentucky to Ontario 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 Kentucky to Ontario?

    Currently, August is the cheapest month in which you can book a flight from Kentucky to Ontario (average of $246). Flying from Kentucky to Ontario in March is currently the most expensive (average of $328). 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 Kentucky to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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Top 4 airlines flying from Kentucky to Ontario

Discover the top 4 airlines that operate flights from Kentucky 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 September 24, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$257Average$606FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$268Average$475FlexibilityNo cancel feeOn-time71%
DeltaCheapest$288Average$393FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$315Average$416FlexibilityNo cancel feeOn-time63%

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