$145 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 2/26. 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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Flight Deals

Cheap Flights from Louisville to Ontario

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Ottawa
Ottawa1 stop$349
London
London2 stops$757
Ottawa
Ottawa1 stop$349
London
London2 stops$757

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, Mar 2 - Mon, Mar 9
Multiple Airlines Logo
1:19 pm - 12:14 am
SDF
-
YYZ
10h 55m1 stop
Multiple Airlines Logo
11:15 am - 2:38 pm
YYZ
-
SDF
27h 23m1 stop
$300Multiple Airlines
Mon, Apr 13 - Wed, Apr 15
Multiple Airlines Logo
12:33 pm - 12:29 am
SDF
-
YYZ
11h 56m1 stop
Multiple Airlines Logo
11:15 am - 2:38 pm
YYZ
-
SDF
27h 23m1 stop
$321Multiple Airlines
Mon, Mar 2 - Mon, Mar 9
Multiple Airlines Logo
1:19 pm - 12:29 am
SDF
-
YYZ
11h 10m1 stop
Multiple Airlines Logo
5:15 pm - 2:38 pm
YYZ
-
SDF
21h 23m2 stops
$326Multiple Airlines
Sun, Feb 22 - Sun, Mar 1
Multiple Airlines Logo
3:33 pm - 12:14 am
SDF
-
YYZ
32h 41m2 stops
Multiple Airlines Logo
8:00 pm - 12:21 pm
YYZ
-
SDF
16h 21m1 stop
$344Multiple Airlines
Mon, Jan 26 - Thu, Jan 29
United Airlines Logo
8:29 am - 9:18 pm
SDF
-
YOW
12h 49m1 stop
United Airlines Logo
5:55 pm - 11:23 pm
YOW
-
SDF
5h 28m1 stop
$349United Airlines
Fri, Jan 23 - Sun, Jan 25
Multiple Airlines Logo
1:55 pm - 12:11 am
SDF
-
YYZ
10h 16m1 stop
Multiple Airlines Logo
8:00 pm - 1:00 pm
YYZ
-
SDF
17h 00m1 stop
$359Multiple Airlines
Mon, Feb 2 - Thu, Feb 5
United Airlines Logo
5:35 am - 4:01 pm
SDF
-
YUL
10h 26m1 stop
United Airlines Logo
9:25 am - 10:30 pm
YUL
-
SDF
13h 05m1 stop
$433United Airlines
Thu, Mar 12 - Mon, Mar 16
American Airlines Logo
6:12 am - 3:05 pm
SDF
-
YUL
8h 53m1 stop
American Airlines Logo
3:45 pm - 11:32 am
YUL
-
SDF
19h 47m1 stop
$439American Airlines
Fri, Jan 23 - Mon, Jan 26
American Airlines Logo
7:20 pm - 4:53 pm
SDF
-
YOW
21h 33m3 stops
American Airlines Logo
6:45 am - 11:19 pm
YOW
-
SDF
16h 34m2 stops
$891American Airlines
Mon, Jan 26 - Thu, Jan 29
WestJet Logo
12:25 pm - 12:42 am
SDF
-
YOW
12h 17m2 stops
WestJet Logo
5:40 am - 5:01 pm
YOW
-
SDF
11h 21m2 stops
$1,159WestJet
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.

Which airlines fly non-stop between Louisville and Ontario?

Airline and price data is aggregated from results in KAYAK’s search results from the last 2 weeks for round-trip flights from Louisville to Ontario.

There is just one airline that flies from Louisville to Ontario direct and that is Delta. The best round-trip deal found from Delta for the route is to Toronto Pearson Intl Airport (YYZ) and costs $370.

Which airlines provide the cheapest flights from Louisville to Ontario?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 72 hours.

In the past 3 days, the cheapest round-trip tickets from Louisville to Ontario were found on United Airlines ($349) and Air Canada ($767).

Good to know

Low seasonFebruary
Cheapest flight$145
Best time to beat the crowds with an average 43% drop in price.
Most popular time to fly and prices are also 31% lower on average.
Flight from Louisville to Toronto

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 airlines 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.
7.9
DeltaOverall score based on 8032 reviews
8.1Boarding
7.2Food
7.8Entertainment
8.5Crew
7.9Comfort
Airline reviews

It was Delta, but the flight attendants were stressful and disrespectful. I am a diamond member a travel weekly. I have not had a negative thing to share in quite some time. But this was noticeable.

2.0 MediocreWilliam, Jan 2026
LGA - BOS
Read more Delta reviews

It was Delta, but the flight attendants were stressful and disrespectful. I am a diamond member a travel weekly. I have not had a negative thing to share in quite some time. But this was noticeable.

Comfort Plus seat 11E seemed smaller than prior flights. The movie selection is good. Watched most of the most recent Tron movie. I'll watch the remaining part later as my movie is saved in the Delta Seatback Experience.

Flight was late from Newark to Atlanta, I asked flight attendant to please let my family of 3 out first when we landed to Atlanta because we were late for our connecting flight to Quito. She didn't and we were late for 5 minutes we couldn't board the plane and spend hours trying to get another flight with customer service for the next day.

I really liked the legroom. I am 6’4”.a at For some reason our seats were not together and using the app to fix it didn’t work. Passengers were nice enough to move for us but you should absolutely ensure a parent sits with their child.

Late delayed flight delays boarding and delays leaving and delays on arrival too. Cramped plane no room no food.

DTW line is too long. The flights from DTW to BWI are always delayed for unknown reasons.

Delta canceled our flight and we had to scramble to find another airline to get home. Phoenix is not a delta hub so they didn’t have another plane. It would have been a red eye though Salt Lake City. Getting in at 5am. No bueno.

This flight was no comparison to our prior flight. I'm thinking it all has to do with the age of the aircraft.

This flight was a first class choice and left much to be desired. Seat backs on seats were falling apart and torn. Seats actually didn't come to a "full & upright position". Pull out table was sprung. Not any significant leg room. All in all we were on an obviously older plane and felt overcharged for what we received as first class.

A 12 hour flight during the day with one real meal service - are you kidding? Also the breakfast was one of the worst and not what was listed

Everything was good except for flight delay, but it was because of the snow storm in the arrival airport.

The flight was cancelled less than 24 hours before departure. The alternate flight was a day later going from Grenada to Toronto to Vancouver to Calgary to Montreal. 2 days in the air. Not serious, Very bad service

I like the wider seats, Plus lots of legroom, Lacking entertainment, no tv or screen to play with

Liked in-flight wifi Did not like - nothing to complain, really. All good

The keg from Edmonton to Toronto My wife found it very cold. Other than that great flight.

Smooth flight Staff were courteous and welcoming upon entering and exiting the plane Pilot and crew provided frequent updates Leg space was not pleasant but manageable

Everything was good except I was a bit disappointed that I had to pay US $150 for bags.

Flight itself good .Landing at terminal3 and connections to terminal1,it is connections nightmare,specially for disable person

The seats very Uncomfortable, no meal and no entertainment for a 4Hours flight. Smooth Flight, Great Take off and landing. Superb crew!

The flight attendants were super! They created a cosy and warm flight atmosphere!

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

Information on your arrival and departure airports