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Louisville

$153+ Cheap flights from Ontario to Louisville (SDF)

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 9/14. Fares are subject to change and may not be available on all flights or dates of travel.
YYZ — SDF
Aug 5 — Aug 121
Tue 8/5
Tue 8/12
1 adult, Economy
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Cheap flight deals from Ontario to Louisville

Keep the following information in mind while searching for Ontario to Louisville flight deals. Data was last updated July 31, 2025.

Round-trip from

$332
(American Airlines)

One-way from

$153
(Mytrip)

Popular in

January

Cheapest in

February

Average price

$477
From Ontario to Louisville Intl
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One-way flight from Ontario to Louisville Intl
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Highest demand for flights based on searches. 10% potential increase in price ($45 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($17 potential savings vs. average RT price).
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Average for round-trip flights in July 2025
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Find flight deals from Ontario to Louisville

Cheapest flights from Ontario to Louisville
Explore the most affordable flight options available from Ontario to Louisville. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 31, 2025.

This American Airlines deal was found by Cheapflights users on 7/30. 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.
Sat 9/1312:31 pmYUL - SDF
1 stop10h 32mAmerican Airlines
Sat 9/206:12 pmSDF - YUL
1 stop17h 34mAmerican Airlines
Deal found 7/30$332
This Mytrip deal was found by Cheapflights users on 7/30. 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.
Sat 9/136:30 amYYZ - SDF
1 stop15h 34mMultiple Airlines
Sat 9/2010:14 amSDF - YYZ
1 stop13h 27mMultiple Airlines
Deal found 7/30$334
This American Airlines deal was found by Cheapflights users on 7/31. 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.
Tue 10/281:15 pmYYZ - SDF
1 stop9h 48mAmerican Airlines
Mon 11/36:00 amSDF - YYZ
1 stop10h 04mAmerican Airlines
Deal found 7/31$389
This Kiwi.com deal was found by Cheapflights users on 7/29. 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 9/136:45 amYUL - SDF
1 stop26h 34mMultiple Airlines
Sat 9/2010:14 amSDF - YUL
2 stops31h 41mMultiple Airlines
Deal found 7/29$400
This United Airlines deal was found by Cheapflights users on 7/31. 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.
Mon 10/69:00 pmYYZ - SDF
1 stop13h 01mUnited Airlines
Fri 11/77:00 amSDF - YYZ
1 stop14h 21mUnited Airlines
Deal found 7/31$412
This United Airlines deal was found by Cheapflights users on 7/29. 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.
Sat 9/138:20 amYUL - SDF
1 stop12h 13mUnited Airlines
Sat 9/209:05 amSDF - YUL
1 stop9h 45mUnited Airlines
Deal found 7/29$451
This United Airlines deal was found by Cheapflights users on 7/29. 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.
Wed 9/36:33 amYOW - SDF
1 stop15h 51mUnited Airlines
Wed 9/1710:55 amSDF - YOW
1 stop10h 40mUnited Airlines
Deal found 7/29$526
This FlightHub deal was found by Cheapflights users on 7/30. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/121:20 pmYYZ - SDF
1 stop5h 08mWestJet
Sun 9/146:00 amSDF - YYZ
2 stops12h 52mWestJet
Deal found 7/30$555
This United deal was found by Cheapflights users on 7/29. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/39:50 amYOW - SDF
2 stops12h 34mMultiple Airlines
Wed 9/176:15 amSDF - YOW
2 stops7h 36mMultiple Airlines
Deal found 7/29$587
This FlightHub deal was found by Cheapflights users on 7/30. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/612:47 pmYUL - SDF
1 stop21h 02mWestJet
Thu 8/712:50 pmSDF - YUL
1 stop5h 04mWestJet
Deal found 7/30$683
This Air Canada deal was found by Cheapflights users on 7/29. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2111:10 amYOW - SDF
2 stops12h 05mAir Canada
Sun 8/246:15 amSDF - YOW
1 stop10h 28mAir Canada
Deal found 7/29$759
This Delta deal was found by Cheapflights users on 7/31. 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.
Mon 8/46:59 pmYUL - SDF
1 stop5h 33mDelta
Fri 8/85:53 pmSDF - YUL
1 stop6h 02mDelta
Deal found 7/31$784

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Louisville 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 July 31, 2025.
Use the filters below to find and compare flights from Ontario to Louisville that are best for you.

Fly from

Ontario

Fly to

Louisville

Route

Depart

Return

Price

MontrealLouisville

YUL - SDF

YULSDF

Montreal Pierre Elliott Trudeau Intl

Sat 9/13

12:31 pm-11:03 pm

1 stop10h 32m

Louisville Intl

Sat 9/20

6:12 pm-11:46 am

1 stop17h 34m

$332

TorontoLouisville

YYZ - SDF

YYZSDF

Toronto Pearson Intl

Sat 9/13

6:30 am-10:04 pm

1 stop15h 34m

Louisville Intl

Sat 9/20

10:14 am-11:41 pm

1 stop13h 27m

$334

TorontoLouisville

YYZ - SDF

YYZSDF

Toronto Pearson Intl

Tue 10/28

1:15 pm-11:03 pm

1 stop9h 48m

Louisville Intl

Mon 11/3

6:00 am-4:04 pm

1 stop10h 04m

$389

MontrealLouisville

YUL - SDF

YULSDF

Montreal Pierre Elliott Trudeau Intl

Sat 9/13

6:45 am-9:19 am

1 stop26h 34m

Louisville Intl

Sat 9/20

10:14 am-5:55 pm

2 stops31h 41m

$400

TorontoLouisville

YYZ - SDF

YYZSDF

Toronto Pearson Intl

Mon 10/6

9:00 pm-10:01 am

1 stop13h 01m

Louisville Intl

Fri 11/7

7:00 am-9:21 pm

1 stop14h 21m

$412

MontrealLouisville

YUL - SDF

YULSDF

Montreal Pierre Elliott Trudeau Intl

Sat 9/13

8:20 am-8:33 pm

1 stop12h 13m

Louisville Intl

Sat 9/20

9:05 am-6:50 pm

1 stop9h 45m

$451

OttawaLouisville

YOW - SDF

YOWSDF

Ottawa

Wed 9/3

6:33 am-10:24 pm

1 stop15h 51m

Louisville Intl

Wed 9/17

10:55 am-9:35 pm

1 stop10h 40m

$526

TorontoLouisville

YYZ - SDF

YYZSDF

Toronto Pearson Intl

Fri 9/12

1:20 pm-6:28 pm

1 stop5h 08m

Louisville Intl

Sun 9/14

6:00 am-6:52 pm

2 stops12h 52m

$555

OttawaLouisville

YOW - SDF

YOWSDF

Ottawa

Wed 9/3

9:50 am-10:24 pm

2 stops12h 34m

Louisville Intl

Wed 9/17

6:15 am-1:51 pm

2 stops7h 36m

$587

OttawaLouisville

YOW - SDF

YOWSDF

Ottawa

Thu 8/21

11:10 am-11:15 pm

2 stops12h 05m

Louisville Intl

Sun 8/24

6:15 am-4:43 pm

1 stop10h 28m

$759

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/31

Showing 1-10 of 17 results
1
2

Best time to book a flight from Ontario to Louisville

Have a flexible travel schedule? Discover the best time to fly to Louisville 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 Louisville

What is the cheapest month to book a flight from Region of Ontario to Louisville?

Currently, January is the cheapest month in which you can book a flight from Region of Ontario to Louisville (average of $299). Flying from Region of Ontario to Louisville in April is currently the most expensive (average of $369). 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 ON to SDF?

Find hourly flight availability from Ontario to Louisville. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 31, 2025.

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

Reviews of airlines servicing Louisville

Get insights into the airlines that provide service to Louisville. 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 Louisville. Reviews last updated July 31, 2025.
Peruse reviews from past customers who have flown with Delta, United Airlines, and American Airlines from Ontario to Louisville to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,981 reviews

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Delta
8.0
Very good
7,981 reviews
Delta
8.0
Very good
7,981 reviews

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
United Airlines
7.4
Good
8,900 reviews
Delta
8.0
Very good
7,981 reviews

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,981 reviews

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
WestJet
7.2
Good
2,978 reviews
Delta
8.0
Very good
7,981 reviews

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.
Air Canada
7.1
Good
9,851 reviews
Delta
8.0
Very good
7,981 reviews

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.9

Overall

8.0

Food

7.3

Reviews

1 / 20
8.0
Excellent

Michael,Jul 2025

AMS - ATL

Overall it was great experience, with the exception of snack food. The food offered in two main meals was just fine but for the mid-flight snack, the only option was a large cookie, too sweet and high sugar content. Snacks at the back of the plane were also mainly sweets. There was one nice baked cheddar option but it quickly ran out.

Related info for your journey

Find useful and relevant information for your journey from Ontario to Louisville. 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 Louisville from Ontario?

    Louisville Intl (SDF), located 5.3 mi from the city center, is the airport you fly into when you book flights from Ontario to Louisville.

  • What are the cheapest airlines to fly from Region of Ontario to Louisville one-way?

    For one-way options, check prices for United Airlines. According to our data, you can fly for as low as $256. Users have also found prices from $337 and $346 on American Airlines and WestJet, respectively.

  • What are the most popular routes from Region of Ontario to Louisville?

    When deciding which route to take from Region of Ontario to Louisville consider Toronto Pearson Intl - Louisville Intl, Ottawa - Louisville Intl or Montreal Pierre Elliott Trudeau Intl - Louisville Intl as they are the most popular.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Ontario to Louisville 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 Region of Ontario to Louisville?

    Currently, January is the cheapest month in which you can book a flight from Region of Ontario to Louisville (average of $299). Flying from Region of Ontario to Louisville in April is currently the most expensive (average of $369). 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

Traveling to a place near Louisville?

Book flights to Louisville if you plan to visit one of these locations
Shepherdsville
Jeffersonville
Elizabethtown
Corydon
Bardstown

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Alternative routes for Ontario to Louisville

See prices for flight routes from nearby airports that may be better suited for you.
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Top 2 airlines flying from Ontario to Louisville

Discover the top 2 airlines that operate flights from Ontario to Louisville. 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 July 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$258Average$327FlexibilityNo cancel feeOn-time71%
WestJetCheapest$296Average$428FlexibilityNo cancel feeOn-time60%

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