$142 Find Cheap Flights from Louisville to Ontario

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Louisville to Ontario departing on 6/1. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Ontario

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Louisville to Ontario, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Louisville to Ontario, as well as popular online travel agencies
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Cheap Flights from Louisville to Ontario

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Ottawa
Ottawa1 stop$341
London
London2 stops$1,665
Ottawa
Ottawa1 stop$341
London
London2 stops$1,665

Book Cheap Louisville to Ontario Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Louisville to Ontario that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Louisville to Ontario

Mon, Apr 20 - Fri, Apr 24
Multiple Airlines Logo
6:06 pm - 7:05 pm
SDF
-
YYZ
24h 59m
1 stop
Multiple Airlines Logo
8:30 pm - 5:04 pm
YYZ
-
SDF
20h 34m
1 stop
$332Multiple Airlines
Mon, Jun 1 - Tue, Jun 30
United Airlines Logo
9:00 am - 5:07 pm
SDF
-
YOW
8h 07m
1 stop
United Airlines Logo
5:50 pm - 10:55 pm
YOW
-
SDF
5h 05m
1 stop
$341United Airlines
Wed, Jun 3 - Sat, Jun 6
United Airlines Logo
6:00 am - 2:17 pm
SDF
-
YOW
8h 17m
1 stop
United Airlines Logo
5:20 pm - 11:59 pm
YOW
-
SDF
6h 39m
1 stop
$353United Airlines
Tue, May 26 - Fri, May 29
United Airlines Logo
7:10 am - 9:35 pm
SDF
-
YOW
14h 25m
1 stop
United Airlines Logo
6:00 am - 10:23 am
YOW
-
SDF
4h 23m
1 stop
$363United Airlines
Sat, May 23 - Sat, May 30
United Airlines Logo
10:00 am - 11:54 pm
SDF
-
YOW
13h 54m
1 stop
United Airlines Logo
5:20 pm - 11:59 pm
YOW
-
SDF
6h 39m
1 stop
$374United Airlines
Mon, Apr 20 - Wed, Apr 22
Multiple Airlines Logo
7:48 pm - 2:05 pm
SDF
-
YYZ
18h 17m
1 stop
Multiple Airlines Logo
11:15 am - 5:04 pm
YYZ
-
SDF
29h 49m
1 stop
$377Multiple Airlines
Mon, Jun 15 - Tue, Jun 16
United Airlines Logo
10:00 am - 11:54 pm
SDF
-
YOW
13h 54m
1 stop
United Airlines Logo
5:20 pm - 11:59 pm
YOW
-
SDF
6h 39m
1 stop
$377United Airlines
Mon, Apr 20 - Fri, Apr 24
Multiple Airlines Logo
6:06 pm - 7:05 pm
SDF
-
YYZ
24h 59m
1 stop
Multiple Airlines Logo
11:30 pm - 5:04 pm
YYZ
-
SDF
17h 34m
2 stops
$383Multiple Airlines
Fri, Aug 14 - Tue, Aug 18
Air Canada Logo
6:00 am - 9:56 am
SDF
-
YOW
3h 56m
1 stop
Air Canada Logo
9:55 am - 10:22 pm
YOW
-
SDF
12h 27m
2 stops
$443Air Canada
Sun, May 24 - Sun, May 31
WestJet Logo
5:52 pm - 5:20 am
SDF
-
YXU
35h 28m
2 stops
WestJet Logo
5:55 pm - 12:10 pm
YXU
-
SDF
18h 15m
2 stops
$1,665WestJet
Booking Insights

KAYAK's insights & trends for Louisville to Ontario flights

Get data-powered insights and trends into flights from Louisville to Ontario to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from Louisville to Region of Ontario?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Louisville to Region of Ontario departing in April.

FAQs - booking Ontario flights

  • How does KAYAK find such low prices on flights from Louisville to Ontario?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Louisville to Ontario.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Louisville to Ontario?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Louisville to Ontario is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Louisville to Ontario?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from Louisville to Ontario with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Louisville to Ontario?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from Louisville to Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Louisville to Ontario

 
See real verified KAYAK customer reviews for airlines flying from Louisville to Ontario. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Louisville to Ontario? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.1
American AirlinesOverall score based on 11564 reviews
7.5Boarding
6.4Food
7.9Crew
6.8Entertainment
7.2Comfort
Airline reviews

The new planes (American Eagle) are beautiful and especially comfortable. The flight attendants are consistently professional and courteous. And, while it may seem inconsequential, the new liquid tube of coffee creamer—in contrast to the powdered coffee creamer—makes all the difference in a cup of coffee.

10.0 ExcellentDeborah Jacqueline Diana, Apr 2026
MIA - ORD
Read more American Airlines reviews

The new planes (American Eagle) are beautiful and especially comfortable. The flight attendants are consistently professional and courteous. And, while it may seem inconsequential, the new liquid tube of coffee creamer—in contrast to the powdered coffee creamer—makes all the difference in a cup of coffee.

Cleared standby and gave up my seat. Terrible policy and boarding experience

Flight was delayed and they gave up my seat on my connection, even when I could still make the flight

The WiFi would not connect enough for me to do my actual work. It permaspooled, disconnected, said it was connected, then wouldn't open an email... it was frustrating. I am not a tall person, 5'4" - and I felt cramped with little room to reach into my bag under the seat in front of me. I feel sorry for anyone taller than me having to fly. the one positive thing I will add, is the overhead bins are roomy enough to manage more bags than other carriers.

Air condition was not working for long both after boarding and also after landing ; unbearably hot and suffocating

On time flight, good communication about boarding, lines didn't form unnecessarily for boarding before their group was announced (kept aisles clear), friendly flight attendants and service

Flight was extremely hot and they made us check our bags when the space was nowhere near full

Everything was excellent and I enjoyed myself. Thank for everything

THe flight was an hour late. You got us on the plan and we sat on the ground for 45 minutes with no information from the pilot whatsoever. Worst flight this year.

Boarding was quick and efficient. We arrived at our destination early.

Everything you need to know for your flight from Louisville to Ontario

Information on your arrival and departure airports