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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 3/10. Fares are subject to change and may not be available on all flights or dates of travel.
SDF — ONT
Mar 6 — Mar 131
Fri 3/6
Fri 3/13
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 February 4, 2026.

This Kiwi.com deal was found by Cheapflights users on 2/2. 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 2/278:45 pm
BNA
-
ONT
1 stop24h 29m
Multiple Airlines
Mon 3/26:43 pm
ONT
-
BNA
1 stop8h 25m
Multiple Airlines
Deal found 2/2$174
This Kiwi.com deal was found by Cheapflights users on 2/1. 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.
Wed 3/48:45 pm
BNA
-
ONT
1 stop18h 26m
Multiple Airlines
Tue 3/172:23 pm
ONT
-
BNA
1 stop12h 47m
Multiple Airlines
Deal found 2/1$178
This Kiwi.com deal was found by Cheapflights users on 2/3. 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.
Tue 3/38:45 pm
BNA
-
ONT
1 stop23h 37m
Multiple Airlines
Tue 3/102:23 pm
ONT
-
BNA
1 stop12h 45m
Multiple Airlines
Deal found 2/3$181
This Kiwi.com deal was found by Cheapflights users on 2/2. 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.
Thu 3/128:41 pm
BNA
-
ONT
1 stop13h 25m
Multiple Airlines
Wed 3/182:23 pm
ONT
-
BNA
1 stop12h 47m
Multiple Airlines
Deal found 2/2$187
This Kiwi.com deal was found by Cheapflights users on 2/2. 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.
Thu 3/58:45 pm
BNA
-
ONT
1 stop13h 21m
Multiple Airlines
Wed 3/112:23 pm
ONT
-
BNA
1 stop12h 45m
Multiple Airlines
Deal found 2/2$188
This Frontier deal was found by Cheapflights users on 2/3. 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 4/2312:09 pm
BNA
-
ONT
1 stop13h 15m
Frontier
Sun 4/2612:59 am
ONT
-
BNA
1 stop11h 30m
Frontier
Deal found 2/3$190
This Frontier deal was found by Cheapflights users on 2/3. 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 4/201:05 pm
CVG
-
ONT
1 stop13h 19m
Frontier
Thu 4/238:59 pm
ONT
-
CVG
1 stop6h 16m
Frontier
Deal found 2/3$190
This Kiwi.com deal was found by Cheapflights users on 2/2. 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.
Sat 2/288:45 pm
BNA
-
ONT
1 stop26h 44m
Multiple Airlines
Mon 3/26:43 pm
ONT
-
BNA
1 stop8h 25m
Multiple Airlines
Deal found 2/2$192
This Mytrip deal was found by Cheapflights users on 2/2. 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.
Mon 3/27:00 am
CVG
-
ONT
1 stop19h 59m
Frontier
Thu 3/52:06 pm
ONT
-
CVG
1 stop7h 53m
Frontier
Deal found 2/2$199
This Expedia deal was found by Cheapflights users on 2/2. 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.
Mon 2/237:00 am
CVG
-
ONT
1 stop19h 59m
Frontier
Mon 3/22:06 pm
ONT
-
CVG
1 stop7h 53m
Frontier
Deal found 2/2$200
This CheapOair deal was found by Cheapflights users on 2/3. 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 2/237:00 am
CVG
-
ONT
1 stop19h 59m
Frontier
Wed 2/257:17 pm
ONT
-
CVG
1 stop25h 42m
Frontier
Deal found 2/3$201
This Kiwi.com deal was found by Cheapflights users on 2/3. 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 3/611:58 am
CVG
-
ONT
1 stop15h 01m
Frontier
Mon 3/99:40 pm
ONT
-
CVG
2 stops13h 44m
Frontier
Deal found 2/3$203

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 February 4, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$174
(Kiwi.com)

One-way from

$78
(Kiwi.com)

Popular in

April

Cheapest in

July

Average price

$370
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. 12% potential increase in price ($47 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($15 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 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 February 4, 2026.
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

NashvilleOntario

BNA - ONT

BNAONT

Nashville Intl

Thu 4/16

12:09 pm-11:24 pm

1 stop13h 15m

Ontario

Sun 4/19

12:59 am-2:29 pm

1 stop11h 30m

$190

NashvilleOntario

BNA - ONT

BNAONT

Nashville Intl

Thu 2/19

2:20 pm-9:24 pm

1 stop9h 04m

Ontario

Mon 2/23

11:59 pm-9:17 am

1 stop7h 18m

$205

NashvilleOntario

BNA - ONT

BNAONT

Nashville Intl

Wed 3/4

9:25 am-9:34 pm

2 stops14h 09m

Ontario

Tue 3/17

2:23 pm-5:10 am

1 stop12h 47m

$215

NashvilleOntario

BNA - ONT

BNAONT

Nashville Intl

Mon 2/23

7:35 pm-11:59 pm

1 stop6h 24m

Ontario

Thu 2/26

6:05 am-6:50 pm

1 stop10h 45m

$232

CincinnatiOntario

CVG - ONT

CVGONT

Cincinnati Cinci./N. Kentucky

Tue 3/3

8:09 am-3:08 pm

1 stop9h 59m

Ontario

Wed 3/18

6:00 am-6:29 pm

1 stop9h 29m

$247

NashvilleOntario

BNA - ONT

BNAONT

Nashville Intl

Fri 3/27

8:41 pm-1:28 pm

1 stop18h 47m

Ontario

Mon 3/30

9:49 pm-2:16 pm

2 stops14h 27m

$249

CincinnatiOntario

CVG - ONT

CVGONT

Cincinnati Cinci./N. Kentucky

Mon 2/23

1:09 pm-5:48 pm

1 stop7h 39m

Ontario

Thu 2/26

2:08 pm-11:42 pm

1 stop6h 34m

$265

NashvilleOntario

BNA - ONT

BNAONT

Nashville Intl

Tue 3/3

7:00 am-3:08 pm

1 stop10h 08m

Ontario

Wed 3/11

12:02 pm-11:59 pm

1 stop9h 57m

$271

NashvilleOntario

BNA - ONT

BNAONT

Nashville Intl

Wed 2/11

7:15 am-12:16 pm

1 stop7h 01m

Ontario

Sun 2/15

1:10 pm-10:00 pm

1 stop6h 50m

$277

CincinnatiOntario

CVG - ONT

CVGONT

Cincinnati Cinci./N. Kentucky

Tue 2/24

8:12 am-12:07 pm

1 stop6h 55m

Ontario

Tue 3/10

10:25 pm-10:37 am

1 stop9h 12m

$277

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/3

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, May is the cheapest month in which you can book a flight from Kentucky to Ontario (average of $93). Flying from Kentucky to Ontario in April is currently the most expensive (average of $324). 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.

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 9h 04m. Kentucky and Ontario are separated by a distance of 1745 mi. This flight may include one or multiple stops.

  • 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, May is the cheapest month in which you can book a flight from Kentucky to Ontario (average of $93). Flying from Kentucky to Ontario in April is currently the most expensive (average of $324). 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 February 4, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$268Average$458FlexibilityNo cancel feeOn-time71%
DeltaCheapest$288Average$344FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$302Average$385FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$344Average$607FlexibilityNo cancel feeOn-time69%

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