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$128+ Cheap flights from Louisville (SDF) to Ontario

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 9/12. Fares are subject to change and may not be available on all flights or dates of travel.
SDF — YYZ
Aug 4 — Aug 111
Mon 8/4
Mon 8/11
1 adult, Economy
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Cheap flight deals from Louisville to Ontario

Keep the following information in mind while searching for Louisville to Ontario flight deals. Data was last updated July 30, 2025.

Round-trip from

$292
(Mytrip)

One-way from

$128
(Kiwi.com)

Popular in

December

Cheapest in

November

Average price

$548
From Louisville Intl to Ontario
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One-way flight from Louisville Intl to Ontario
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Highest demand for flights based on searches. 6% potential increase in price ($30 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($22 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 Louisville to Ontario

Cheapest flights from Louisville to Ontario
Explore the most affordable flight options available from Louisville to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 30, 2025.

This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2211:17 amSDF - YYZ
1 stop12h 35mMultiple Airlines
Sun 9/286:30 amYYZ - SDF
1 stop15h 58mMultiple Airlines
Deal found 7/29$292
This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/85:20 pmSDF - YUL
1 stop21h 51mAmerican Airlines
Tue 11/117:14 amYUL - SDF
2 stops13h 05mAmerican Airlines
Deal found 7/29$350
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/129:47 amSDF - YOW
1 stop7h 33mMultiple Airlines
Tue 9/164:25 pmYOW - SDF
1 stop16h 54mMultiple Airlines
Deal found 7/29$353
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/139:09 pmSDF - YUL
2 stops20h 46mMultiple Airlines
Sat 9/206:45 amYUL - SDF
2 stops15h 43mMultiple Airlines
Deal found 7/29$417
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 8/2310:55 amSDF - YYZ
1 stop7h 40mUnited Airlines
Sat 8/3011:00 amYYZ - SDF
1 stop11h 24mUnited Airlines
Deal found 7/29$491
This Delta deal was found by Cheapflights users on 7/28. 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.
Sun 8/246:00 amSDF - YUL
1 stop10h 07mDelta
Tue 9/26:00 amYUL - SDF
1 stop14h 55mDelta
Deal found 7/28$518
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/810:55 amSDF - YUL
1 stop7h 55mUnited Airlines
Sat 10/188:20 amYUL - SDF
1 stop14h 10mUnited Airlines
Deal found 7/30$522
This American 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/137:00 amSDF - YYZ
1 stop10h 43mAmerican Airlines
Sun 9/146:30 amYYZ - SDF
1 stop7h 50mAmerican Airlines
Deal found 7/29$526
This United Airlines deal was found by Cheapflights users on 7/27. 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.
Thu 8/289:55 amSDF - YOW
1 stop4h 18mUnited Airlines
Mon 9/17:29 pmYOW - SDF
1 stop19h 21mUnited Airlines
Deal found 7/27$755
This Justfly.com deal was found by Cheapflights users on 7/27. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/296:00 amSDF - YOW
2 stops18h 22mWestJet
Mon 9/15:55 amYOW - SDF
2 stops16h 47mWestJet
Deal found 7/27$883

Cheapflights Fare Finder

 
Customize your flight search to find flights from Louisville 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 July 30, 2025.
Use the filters below to find and compare flights from Louisville to Ontario that are best for you.

Fly from

Louisville

Fly to

Ontario

Route

Depart

Return

Price

LouisvilleToronto

SDF - YYZ

SDFYYZ

Louisville Intl

Mon 9/22

11:17 am-11:52 pm

1 stop12h 35m

Toronto Pearson Intl

Sun 9/28

6:30 am-10:28 pm

1 stop15h 58m

$292

LouisvilleMontreal

SDF - YUL

SDFYUL

Louisville Intl

Sat 11/8

5:20 pm-3:11 pm

1 stop21h 51m

Montreal Pierre Elliott Trudeau Intl

Tue 11/11

7:14 am-8:19 pm

2 stops13h 05m

$350

LouisvilleOttawa

SDF - YOW

SDFYOW

Louisville Intl

Fri 9/12

9:47 am-5:20 pm

1 stop7h 33m

Ottawa

Tue 9/16

4:25 pm-9:19 am

1 stop16h 54m

$353

LouisvilleMontreal

SDF - YUL

SDFYUL

Louisville Intl

Sat 9/13

9:09 pm-5:55 pm

2 stops20h 46m

Montreal Pierre Elliott Trudeau Intl

Sat 9/20

6:45 am-10:28 pm

2 stops15h 43m

$417

LouisvilleToronto

SDF - YYZ

SDFYYZ

Louisville Intl

Sat 8/23

10:55 am-6:35 pm

1 stop7h 40m

Toronto Pearson Intl

Sat 8/30

11:00 am-10:24 pm

1 stop11h 24m

$491

LouisvilleMontreal

SDF - YUL

SDFYUL

Louisville Intl

Sun 8/24

6:00 am-4:07 pm

1 stop10h 07m

Montreal Pierre Elliott Trudeau Intl

Tue 9/2

6:00 am-8:55 pm

1 stop14h 55m

$518

LouisvilleMontreal

SDF - YUL

SDFYUL

Louisville Intl

Wed 10/8

10:55 am-6:50 pm

1 stop7h 55m

Montreal Pierre Elliott Trudeau Intl

Sat 10/18

8:20 am-10:30 pm

1 stop14h 10m

$522

LouisvilleToronto

SDF - YYZ

SDFYYZ

Louisville Intl

Sat 9/13

7:00 am-5:43 pm

1 stop10h 43m

Toronto Pearson Intl

Sun 9/14

6:30 am-2:20 pm

1 stop7h 50m

$526

LouisvilleOttawa

SDF - YOW

SDFYOW

Louisville Intl

Thu 8/28

9:55 am-2:13 pm

1 stop4h 18m

Ottawa

Mon 9/1

7:29 pm-2:50 pm

1 stop19h 21m

$755

LouisvilleOttawa

SDF - YOW

SDFYOW

Louisville Intl

Fri 8/29

6:00 am-12:22 am

2 stops18h 22m

Ottawa

Mon 9/1

5:55 am-10:42 pm

2 stops16h 47m

$883

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

Showing 1-10 of 21 results
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Best time to book a flight from Louisville to Ontario

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

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

Currently, January is the cheapest month in which you can book a flight from Louisville to Region of Ontario (average of $243). Flying from Louisville to Region of Ontario in August is currently the most expensive (average of $348). 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 Louisville to Region of Ontario?

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated July 30, 2025.
See what other customers who have flown with Delta, United Airlines, and American Airlines from Louisville to Ontario have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,980 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Boarding

8.2

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,980 reviews
Delta
8.0
Very good
7,980 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Boarding

8.2

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,896 reviews
Delta
8.0
Very good
7,980 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Boarding

8.2

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,980 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Boarding

8.2

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
WestJet
7.2
Good
2,975 reviews
Delta
8.0
Very good
7,980 reviews

Entertainment

7.9

Food

7.3

Overall

8.0

Crew

8.5

Boarding

8.2

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Related info for your journey

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

    If you book a flight to Ontario from Louisville, you will be flying from Louisville Intl, which is the city’s only airport. Louisville Intl (SDF) is located 5.3 mi from the center of Louisville.

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

    One-way options have recently been found by users for as low as $169 on American Airlines. Other airlines that offer cheap prices include United Airlines from $218 and Delta from $359 one-way.

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

    The most popular flight routes from Louisville to Region of Ontario are Louisville Intl - Montreal Pierre Elliott Trudeau Intl, Louisville Intl - Toronto Pearson Intl and Louisville Intl - Ottawa.

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

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

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

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

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

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

    Currently, January is the cheapest month in which you can book a flight from Louisville to Region of Ontario (average of $243). Flying from Louisville to Region of Ontario in August is currently the most expensive (average of $348). 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 Louisville 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 Louisville to Ontario

Discover the top 4 airlines that operate flights from Louisville 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 July 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapest$183Average$567FlexibilityNo cancel feeOn-time60%
United AirlinesCheapest$276Average$537FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$276Average$385FlexibilityNo cancel feeOn-time71%
DeltaCheapest$303Average$421FlexibilityNo cancel feeOn-timeN/A

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