HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Ontario

$144+ 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 5/20. Fares are subject to change and may not be available on all flights or dates of travel.
SDF — YYZ
Apr 22 — Apr 291
Tue 4/22
Tue 4/29
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Louisville to Ontario with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 April 17, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$274
(Mytrip)

One-way from

$144
(United Airlines)

Popular in

December

Cheapest in

November

Average price

$445
Provider with most accurate pricing for Louisville Intl-Toronto (YTO) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Louisville Intl-Toronto (YTO) flights.
Search Deals
From Louisville Intl to Ontario
Search Deals
One-way flight from Louisville Intl to Ontario
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($75 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease ($26 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2025
Search Deals

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 April 17, 2025.

This Mytrip deal was found by Cheapflights users on 4/16. 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 6/145:03 amSDF - YYZ
1 stop9h 02mMultiple Airlines
Wed 6/184:00 pmYYZ - SDF
1 stop20h 13mMultiple Airlines
Deal found 4/16$274
This Air Canada deal was found by Cheapflights users on 4/16. 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.
Sat 5/36:00 amSDF - YYZ
1 stop5h 59mAir Canada
Mon 5/53:00 pmYYZ - SDF
1 stop6h 38mAir Canada
Deal found 4/16$342
This United Airlines deal was found by Cheapflights users on 4/16. 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 5/2010:08 amSDF - YYZ
1 stop7h 01mUnited Airlines
Sat 5/2411:00 amYYZ - SDF
1 stop9h 26mUnited Airlines
Deal found 4/16$343
This Delta deal was found by Cheapflights users on 4/17. 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.
Fri 6/207:50 amSDF - YYZ
1 stop6h 51mDelta
Mon 6/236:15 amYYZ - SDF
1 stop8h 04mDelta
Deal found 4/17$354
This Delta deal was found by Cheapflights users on 4/17. 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.
Thu 5/16:00 amSDF - YUL
1 stop5h 33mDelta
Sun 5/46:00 amYUL - SDF
1 stop6h 33mDelta
Deal found 4/17$359
This Air Canada deal was found by Cheapflights users on 4/17. 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 5/110:08 amSDF - YUL
1 stop7h 07mAir Canada
Wed 5/71:00 pmYUL - SDF
2 stops9h 30mAir Canada
Deal found 4/17$364
This Mytrip deal was found by Cheapflights users on 4/17. 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 6/3012:19 pmSDF - YUL
3 stops33h 56mMultiple Airlines
Fri 7/46:45 amYUL - SDF
2 stops27h 19mMultiple Airlines
Deal found 4/17$383
This American Airlines deal was found by Cheapflights users on 4/17. 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.
Mon 9/228:23 pmSDF - YUL
1 stop17h 07mAmerican Airlines
Thu 9/2510:37 amYUL - SDF
2 stops11h 04mAmerican Airlines
Deal found 4/17$406
This Mytrip deal was found by Cheapflights users on 4/16. 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 5/316:25 pmSDF - YOW
2 stops22h 50mMultiple Airlines
Sat 6/74:25 pmYOW - SDF
1 stop17h 53mMultiple Airlines
Deal found 4/16$421
This United Airlines deal was found by Cheapflights users on 4/17. 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 4/306:45 amSDF - YUL
1 stop6h 24mUnited Airlines
Sun 5/49:15 amYUL - SDF
1 stop10h 32mUnited Airlines
Deal found 4/17$438
This WestJet deal was found by Cheapflights users on 4/16. 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 WestJet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/86:00 amSDF - YYZ
1 stop6h 14mWestJet
Fri 5/96:30 amYYZ - SDF
2 stops27h 26mWestJet
Deal found 4/16$484
This American Airlines deal was found by Cheapflights users on 4/16. 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 8/2810:59 amSDF - YYZ
1 stop4h 16mAmerican Airlines
Mon 9/17:35 pmYYZ - SDF
1 stop4h 55mAmerican Airlines
Deal found 4/16$490

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 April 17, 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

Sat 6/14

5:03 am-2:05 pm

1 stop9h 02m

Toronto Pearson Intl

Wed 6/18

4:00 pm-12:13 pm

1 stop20h 13m

$274

LouisvilleToronto

SDF - YYZ

SDFYYZ

Louisville Intl

Sat 5/3

6:00 am-11:59 am

1 stop5h 59m

Toronto Pearson Intl

Mon 5/5

3:00 pm-9:38 pm

1 stop6h 38m

$342

LouisvilleToronto

SDF - YYZ

SDFYYZ

Louisville Intl

Tue 5/20

10:08 am-5:09 pm

1 stop7h 01m

Toronto Pearson Intl

Sat 5/24

11:00 am-8:26 pm

1 stop9h 26m

$343

LouisvilleToronto

SDF - YYZ

SDFYYZ

Louisville Intl

Fri 6/20

7:50 am-2:41 pm

1 stop6h 51m

Toronto Pearson Intl

Mon 6/23

6:15 am-2:19 pm

1 stop8h 04m

$354

LouisvilleMontreal

SDF - YUL

SDFYUL

Louisville Intl

Thu 5/1

6:00 am-11:33 am

1 stop5h 33m

Montreal Pierre Elliott Trudeau Intl

Sun 5/4

6:00 am-12:33 pm

1 stop6h 33m

$359

LouisvilleMontreal

SDF - YUL

SDFYUL

Louisville Intl

Thu 5/1

10:08 am-5:15 pm

1 stop7h 07m

Montreal Pierre Elliott Trudeau Intl

Wed 5/7

1:00 pm-10:30 pm

2 stops9h 30m

$364

LouisvilleMontreal

SDF - YUL

SDFYUL

Louisville Intl

Mon 6/30

12:19 pm-10:15 pm

3 stops33h 56m

Montreal Pierre Elliott Trudeau Intl

Fri 7/4

6:45 am-10:04 am

2 stops27h 19m

$383

LouisvilleMontreal

SDF - YUL

SDFYUL

Louisville Intl

Mon 9/22

8:23 pm-1:30 pm

1 stop17h 07m

Montreal Pierre Elliott Trudeau Intl

Thu 9/25

10:37 am-9:41 pm

2 stops11h 04m

$406

LouisvilleOttawa

SDF - YOW

SDFYOW

Louisville Intl

Sat 5/31

6:25 pm-5:15 pm

2 stops22h 50m

Ottawa

Sat 6/7

4:25 pm-10:18 am

1 stop17h 53m

$421

LouisvilleMontreal

SDF - YUL

SDFYUL

Louisville Intl

Wed 4/30

6:45 am-1:09 pm

1 stop6h 24m

Montreal Pierre Elliott Trudeau Intl

Sun 5/4

9:15 am-7:47 pm

1 stop10h 32m

$438

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/16

Showing 1-10 of 20 results
1
2

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 July is currently the most expensive (average of $359). 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.

Rainfall in Ontario by month

Plan your trip to Ontario by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Region of Ontario ranges from 2.0 - 3.3 inches per month. June is typically the wettest month, when rainfall can reach 3.3 in. February is typically the driest time to visit Region of Ontario when rainfall is around 2.0 in.

Temperature in Ontario by month

Plan your trip to Ontario by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Region of Ontario, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 69.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 21.2 F).

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 April 17, 2025.
To help decide which airline to fly from Louisville to Ontario, see what other customers have to say about Delta, United Airlines and American Airlines. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,916 reviews

Food

7.3

Comfort

7.9

Entertainment

7.9

Boarding

8.2

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
8.0
Very good
7,916 reviews
Delta
8.0
Very good
7,916 reviews

Food

7.3

Comfort

7.9

Entertainment

7.9

Boarding

8.2

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
United Airlines
7.4
Good
8,667 reviews
Delta
8.0
Very good
7,916 reviews

Food

7.3

Comfort

7.9

Entertainment

7.9

Boarding

8.2

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,916 reviews

Food

7.3

Comfort

7.9

Entertainment

7.9

Boarding

8.2

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
WestJet
7.2
Good
2,809 reviews
Delta
8.0
Very good
7,916 reviews

Food

7.3

Comfort

7.9

Entertainment

7.9

Boarding

8.2

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Air Canada
7.0
Good
9,143 reviews
Delta
8.0
Very good
7,916 reviews

Food

7.3

Comfort

7.9

Entertainment

7.9

Boarding

8.2

Overall

8.0

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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 $144 on United Airlines. Other airlines that offer cheap prices include Delta from $149 and American Airlines from $286 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 July is currently the most expensive (average of $359). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Louisville to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
Nashville to Vancouver Intl flights
Cincinnati to Vancouver Intl flights
Nashville to Calgary flights
Cincinnati to Pierre Elliott Trudeau Intl flights
Cincinnati to Pearson Intl flights
Nashville to Pearson Intl flights
Nashville to Pierre Elliott Trudeau Intl flights
Cincinnati to Calgary flights
Louisville to Calgary flights
Louisville to Vancouver Intl flights
Nashville to Toronto Island flights
Louisville to Pierre Elliott Trudeau Intl flights
Knoxville to Pearson Intl flights
Cincinnati to Abbotsford flights
Knoxville to Vancouver Intl flights
Nashville to St. John's flights
Louisville to Pearson Intl flights
Cincinnati to Halifax flights
Nashville to Edmonton flights
Nashville to Halifax flights
Lexington to Vancouver Intl flights
Lexington to Pearson Intl flights
Nashville to Québec City flights
Cincinnati to Québec City flights
Cincinnati to Saskatoon flights
Lexington to Pierre Elliott Trudeau Intl flights
Knoxville to Pierre Elliott Trudeau Intl flights
Cincinnati to Edmonton flights
Knoxville to Halifax flights
Knoxville to Calgary flights
Cincinnati to Ottawa flights
Lexington to Calgary flights
Nashville to Ottawa flights
Cincinnati to St. John's flights
Nashville to Victoria flights
Cincinnati to Regina flights
Nashville to Winnipeg flights
Nashville to Hamilton flights
Nashville to Region of Waterloo Intl flights
Knoxville to Moncton flights
Louisville to Ottawa flights
Lexington to Halifax flights
Knoxville to St John flights
Knoxville to Québec City flights
Cincinnati to Winnipeg flights
Knoxville to Ottawa flights
Knoxville to St. John's flights

Top 5 airlines flying from Louisville to Ontario

Discover the top 5 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 April 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$276Average$398FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$276Average$536FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$276Average$398FlexibilityNo cancel feeOn-time71%
DeltaCheapest$312Average$421FlexibilityNo cancel feeOn-timeN/A
WestJetCheapest$331Average$421FlexibilityNo cancel feeOn-time60%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.