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$110+ 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 8/9. Fares are subject to change and may not be available on all flights or dates of travel.
SDF — ONT
Jul 10 — Jul 171
Fri 7/10
Fri 7/17
1 adult, Economy
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Cheap 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 June 10, 2026.

This Delta deal was found by Cheapflights users on 6/10. 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 8/117:30 am
BNA
-
ONT
1 stop6h 46m
Delta
Wed 8/1912:00 pm
ONT
-
BNA
1 stop6h 40m
Delta
Deal found 6/10$237
This Frontier deal was found by Cheapflights users on 6/10. 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 8/1212:25 pm
BNA
-
ONT
1 stop13h 25m
Frontier
Thu 8/2011:43 am
ONT
-
BNA
1 stop6h 46m
Frontier
Deal found 6/10$240
This Booking.com deal was found by Cheapflights users on 6/9. 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 8/63:41 pm
BNA
-
ONT
1 stop26h 13m
Frontier
Mon 8/1010:49 am
ONT
-
BNA
1 stop22h 51m
Frontier
Deal found 6/9$241
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 10/137:05 am
BNA
-
ONT
1 stop7h 25m
Delta
Mon 10/261:00 pm
ONT
-
BNA
1 stop7h 15m
Delta
Deal found 6/8$249
This Expedia deal was found by Cheapflights users on 6/9. 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.
Thu 8/2011:59 am
BNA
-
ONT
1 stop24h 06m
Frontier
Sun 8/233:34 pm
ONT
-
BNA
1 stop26h 55m
Frontier
Deal found 6/9$250
This Booking.com 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/312:09 pm
BNA
-
ONT
1 stop23h 56m
Frontier
Tue 7/710:49 am
ONT
-
BNA
1 stop22h 43m
Frontier
Deal found 6/6$251
This Booking.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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/36:35 pm
BNA
-
ONT
1 stop27h 16m
Frontier
Thu 7/163:40 pm
ONT
-
BNA
1 stop21h 06m
Frontier
Deal found 6/7$252
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.
Tue 9/2211:18 am
BNA
-
ONT
2 stops10h 43m
United Airlines
Sat 9/266:00 am
ONT
-
BNA
1 stop6h 02m
United Airlines
Deal found 6/8$254
This American Airlines deal was found by Cheapflights users on 6/9. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/276:03 am
TYS
-
ONT
1 stop6h 31m
American Airlines
Tue 9/112:33 pm
ONT
-
TYS
1 stop7h 45m
American Airlines
Deal found 6/9$256
This Booking.com deal was found by Cheapflights users on 6/9. 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 7/103:41 pm
BNA
-
ONT
1 stop18h 22m
Frontier
Wed 7/151:38 pm
ONT
-
BNA
1 stop23h 08m
Frontier
Deal found 6/9$256
This Booking.com 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/912:17 pm
BNA
-
ONT
1 stop13h 33m
Frontier
Thu 7/1611:52 am
ONT
-
BNA
1 stop24h 54m
Frontier
Deal found 6/8$258
This Frontier deal was found by Cheapflights users on 6/9. 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 8/118:34 pm
CVG
-
ONT
1 stop6h 16m
Frontier
Wed 8/126:00 am
ONT
-
CVG
1 stop10h 29m
Frontier
Deal found 6/9$258

Find flight deals from Kentucky to Ontario

Keep the following information in mind while searching for Kentucky to Ontario flight deals. Data was last updated June 10, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$237
(Delta)

One-way from

$110
(Kiwi.com)

Popular in

December

Cheapest in

July

Average price

$346
Provider with most accurate pricing for Louisville Intl-Los Angeles flight deals.
Search Deals
Provider most trusted by Cheapflights users for Louisville Intl-Los Angeles flights.
Search Deals
From Kentucky to Ontario
Search Deals
One-way flight from Kentucky to Ontario
Search Deals
Highest demand for flights based on searches. 13% potential increase in price ($54 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($14 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2026
Search Deals

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 June 10, 2026.
Use the filters below to find and compare flights from Kentucky to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

NashvilleOntario

BNA - ONT

BNAONT

Nashville Intl

Sat 10/17

7:16 pm-11:48 pm

1 stop6h 32m

Ontario

Thu 10/22

1:00 pm-10:15 pm

1 stop7h 15m

$261

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Wed 9/23

5:45 am-10:47 am

1 stop8h 02m

Ontario

Mon 9/28

10:00 pm-9:39 am

1 stop8h 39m

$278

KnoxvilleOntario

TYS - ONT

TYSONT

Knoxville McGhee Tyson

Thu 9/17

6:11 pm-10:26 pm

1 stop7h 15m

Ontario

Tue 9/22

7:05 am-5:12 pm

1 stop7h 07m

$278

NashvilleOntario

BNA - ONT

BNAONT

Nashville Intl

Tue 7/28

7:34 pm-11:48 pm

1 stop6h 14m

Ontario

Tue 8/4

1:06 pm-10:50 pm

1 stop7h 44m

$284

NashvilleOntario

BNA - ONT

BNAONT

Nashville Intl

Tue 8/4

6:35 am-12:40 pm

1 stop8h 05m

Ontario

Fri 8/7

5:40 am-3:20 pm

2 stops7h 40m

$321

NashvilleOntario

BNA - ONT

BNAONT

Nashville Intl

Sun 8/16

6:15 am-10:42 am

1 stop6h 27m

Ontario

Sun 8/23

10:00 pm-8:30 am

1 stop8h 30m

$331

NashvilleOntario

BNA - ONT

BNAONT

Nashville Intl

Sun 7/5

7:36 pm-11:49 pm

1 stop6h 13m

Ontario

Tue 7/14

1:00 pm-11:05 pm

1 stop8h 05m

$331

NashvilleOntario

BNA - ONT

BNAONT

Nashville Intl

Tue 8/11

4:15 pm-8:53 pm

1 stop6h 38m

Ontario

Wed 8/12

9:01 am-8:58 pm

1 stop9h 57m

$337

LexingtonOntario

LEX - ONT

LEXONT

Lexington Blue Grass

Tue 9/22

6:00 am-10:47 am

1 stop7h 47m

Ontario

Sat 9/26

11:59 am-10:42 pm

1 stop7h 43m

$341

LexingtonOntario

LEX - ONT

LEXONT

Lexington Blue Grass

Wed 11/4

3:45 pm-10:14 pm

1 stop9h 29m

Ontario

Sat 11/7

7:00 am-5:10 pm

1 stop7h 10m

$341

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/5

Showing 1-10 of 60 resultsSorted by cheapest first
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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, July is the cheapest month in which you can book a flight from Kentucky to Ontario (average of $204). Flying from Kentucky to Ontario in November is currently the most expensive (average of $482). 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.

How much does it cost to fly round-trip from Kentucky to Ontario?

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 32m. 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?

    $148 is the cheapest one-way deal found within the past few days, from American Airlines. You may also be able to find cheap deals on Delta and Southwest, with prices starting from $160 and $162, 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, July is the cheapest month in which you can book a flight from Kentucky to Ontario (average of $204). Flying from Kentucky to Ontario in November is currently the most expensive (average of $482). 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 June 10, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$268Average$471FlexibilityNo cancel feeOn-time71%
DeltaCheapest$288Average$373FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$306Average$447FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$337Average$607FlexibilityNo cancel feeOn-time69%

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