Ontario

$78+ 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 10/21. Fares are subject to change and may not be available on all flights or dates of travel.
SDF — ONT
Sep 11 — Sep 181
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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 August 12, 2026.

This Frontier deal was found by Cheapflights users on 8/11. 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 9/243:14 pm -
1 stop10h 33m
Tue 9/296:15 am -
1 stop6h 03m
Deal found 8/11$158
This Trip.com deal was found by Cheapflights users on 8/11. 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.
Fri 9/113:14 pm -
1 stop10h 33m
Wed 9/166:15 am -
1 stop6h 03m
Deal found 8/11$164
This Expedia deal was found by Cheapflights users on 8/11. 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.
Wed 9/93:14 pm -
1 stop21h 16m
Wed 9/166:15 am -
1 stop6h 03m
Deal found 8/11$167
This Frontier deal was found by Cheapflights users on 8/11. 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.
Sat 9/512:55 pm -
1 stop12h 55m
Sat 9/122:30 pm -
1 stop20h 34m
Deal found 8/11$168
This CheapOair deal was found by Cheapflights users on 8/11. 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 9/512:55 pm -
1 stop23h 09m
Thu 9/1011:45 am -
1 stop24h 33m
Deal found 8/11$177
This CheapOair deal was found by Cheapflights users on 8/11. 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.
Tue 9/112:55 pm -
1 stop12h 55m
Thu 9/33:40 pm -
1 stop20h 06m
Deal found 8/11$186
This Trip.com deal was found by Cheapflights users on 8/11. 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 9/32:41 pm -
1 stop27h 41m
Sat 9/57:56 pm -
1 stop14h 14m
Deal found 8/11$192
This Frontier deal was found by Cheapflights users on 8/10. 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.
Fri 9/113:14 pm -
1 stop10h 33m
Mon 9/146:15 am -
1 stop11h 22m
Deal found 8/10$193
This Frontier deal was found by Cheapflights users on 8/12. 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.
Sat 9/512:55 pm -
1 stop12h 55m
Fri 9/116:15 am -
1 stop11h 22m
Deal found 8/12$202
This CheapOair deal was found by Cheapflights users on 8/11. 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 9/188:32 pm -
1 stop29h 15m
Mon 9/216:15 am -
1 stop11h 40m
Deal found 8/11$203
This Frontier deal was found by Cheapflights users on 8/11. 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 10/277:42 pm -
1 stop6h 13m
Tue 11/36:15 am -
1 stop10h 32m
Deal found 8/11$211
This Frontier deal was found by Cheapflights users on 8/11. 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.
Sat 9/195:16 pm -
1 stop9h 31m
Wed 9/236:15 am -
1 stop6h 56m
Deal found 8/11$218

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 August 12, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$158
(Frontier)

One-way from

$78
(Super.com)

Popular in

December

Cheapest in

October

Average price

$408
Provider with most accurate pricing for Louisville Intl-Los Angeles Los Angeles flight deals.
Provider most trusted by Cheapflights users for Louisville Intl-Los Angeles Los Angeles flights.
From Kentucky to Ontario
One-way flight from Kentucky to Ontario
Highest demand for flights based on searches. 4% potential increase in price ($20 potential increase over avg. RT price).
Cheapest flight prices on average. 1% potential price decrease ($8 potential savings vs. average RT price).
Average for round-trip flights in August 2026

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 August 12, 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 Nashville Intl - ONT Ontario

BNAONT

Nashville Intl

Wed 11/11

4:00 pm-9:40 pm

1 stop7h 40m

Ontario

Tue 11/17

5:45 am-3:55 pm

2 stops8h 10m

$264

CincinnatiOntario

CVG Cincinnati Cinci./N. Kentucky - ONT Ontario

CVGONT

Cincinnati Cinci./N. Kentucky

Sat 8/29

8:30 pm-11:50 pm

1 stop6h 20m

Ontario

Mon 8/31

6:00 am-7:25 pm

1 stop10h 25m

$274

LouisvilleOntario

SDF Louisville Intl - ONT Ontario

SDFONT

Louisville Intl

Sat 9/5

3:25 pm-8:53 pm

1 stop8h 28m

Ontario

Fri 9/11

5:00 am-2:29 pm

1 stop6h 29m

$289

LouisvilleOntario

SDF Louisville Intl - ONT Ontario

SDFONT

Louisville Intl

Wed 9/9

12:10 pm-5:35 pm

2 stops8h 25m

Ontario

Mon 9/21

2:40 pm-11:10 pm

1 stop5h 30m

$322

LexingtonOntario

LEX Lexington Blue Grass - ONT Ontario

LEXONT

Lexington Blue Grass

Sat 12/12

3:38 pm-7:41 pm

1 stop7h 03m

Ontario

Wed 1/6

7:00 am-5:10 pm

1 stop7h 10m

$341

LexingtonOntario

LEX Lexington Blue Grass - ONT Ontario

LEXONT

Lexington Blue Grass

Fri 12/11

5:59 pm-9:59 pm

1 stop7h 00m

Ontario

Fri 1/8

7:00 am-5:10 pm

1 stop7h 10m

$359

NashvilleOntario

BNA Nashville Intl - ONT Ontario

BNAONT

Nashville Intl

Fri 12/25

4:15 pm-10:00 pm

2 stops7h 45m

Ontario

Fri 1/8

9:00 am-7:30 pm

2 stops8h 30m

$384
Quickest round-trip

NashvilleOntario

BNA Nashville Intl - ONT Ontario

BNAONT

Nashville Intl

Fri 9/11

1:25 pm-3:30 pm

Nonstop4h 05m

Ontario

Tue 9/15

12:30 pm-8:30 pm

1 stop6h 00m

$387

NashvilleOntario

BNA Nashville Intl - ONT Ontario

BNAONT

Nashville Intl

Fri 10/2

5:10 am-9:25 am

1 stop6h 15m

Ontario

Sun 10/4

6:00 am-11:50 am

Nonstop3h 50m

$388

LexingtonOntario

LEX Lexington Blue Grass - ONT Ontario

LEXONT

Lexington Blue Grass

Fri 9/11

4:30 pm-8:05 pm

1 stop6h 35m

Ontario

Sun 9/13

10:00 pm-9:22 am

1 stop8h 22m

$389

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/11

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, October is the cheapest month in which you can book a flight from Kentucky to Ontario (average of $358). Flying from Kentucky to Ontario in November is currently the most expensive (average of $630). 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?

Airfare is below average for this route at the moment.
Kentucky to Ontario flights typically cost between $447 and $507 in September.
The cheapest round-trip price found within the last 5 days was $254 on Southwest (Sep 11-Sep 15).

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 20m. Kentucky and Ontario are separated by a distance of 1849 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 Southwest and Delta, with prices starting from $157 and $160, respectively.

  • What are the most popular routes 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, October is the cheapest month in which you can book a flight from Kentucky to Ontario (average of $358). Flying from Kentucky to Ontario in November is currently the most expensive (average of $630). 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.

Top 3 airlines flying from Kentucky to Ontario

Discover the top 3 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 August 12, 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$268Average$430FlexibilityNo cancel feeOn-time71%
DeltaCheapest$288Average$358FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$331Average$486FlexibilityNo cancel feeOn-time63%

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