$192 Find Cheap Flights from Louisville to Ontario - Compare and Save

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 8/24. 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

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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$560
London
London2 stops$870
Ottawa
Ottawa1 stop$560
London
London2 stops$870

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, Oct 5 - Tue, Oct 13
Multiple Airlines Logo
7:21 pm - 4:55 pm
SDF
-
YYZ
21h 34m
1 stop
Multiple Airlines Logo
9:30 am - 8:31 pm
YYZ
-
SDF
35h 01m
2 stops
$377Multiple Airlines
Wed, Oct 14 - Mon, Oct 19
Multiple Airlines Logo
9:11 pm - 8:55 pm
SDF
-
YYZ
23h 44m
2 stops
Multiple Airlines Logo
9:30 am - 6:45 pm
YYZ
-
SDF
9h 15m
1 stop
$394Multiple Airlines
Wed, Oct 14 - Mon, Oct 19
Multiple Airlines Logo
9:11 pm - 8:55 pm
SDF
-
YYZ
23h 44m
2 stops
Multiple Airlines Logo
9:30 am - 6:45 pm
YYZ
-
SDF
9h 15m
1 stop
$400Multiple Airlines
Wed, Aug 26 - Wed, Sep 2
American Airlines Logo
6:11 am - 4:45 pm
SDF
-
YYZ
10h 34m
1 stop
American Airlines Logo
11:01 am - 9:38 pm
YYZ
-
SDF
10h 37m
1 stop
$448American Airlines
Tue, Aug 11 - Tue, Aug 18
WestJet Logo
5:50 pm - 11:52 pm
SDF
-
YUL
6h 02m
1 stop
WestJet Logo
12:44 pm - 7:33 pm
YUL
-
SDF
6h 49m
1 stop
$487WestJet
Sat, Aug 1 - Tue, Aug 25
American Airlines Logo
7:37 am - 9:44 pm
SDF
-
YUL
14h 07m
1 stop
American Airlines Logo
12:30 pm - 9:25 pm
YUL
-
SDF
8h 55m
1 stop
$492American Airlines
Tue, Aug 11 - Wed, Aug 12
United Airlines Logo
1:50 pm - 9:26 pm
SDF
-
YUL
7h 36m
1 stop
United Airlines Logo
3:25 pm - 10:59 pm
YUL
-
SDF
7h 34m
1 stop
$496United Airlines
Fri, Sep 11 - Mon, Sep 14
WestJet Logo
5:40 pm - 11:27 pm
SDF
-
YUL
5h 47m
1 stop
WestJet Logo
6:47 pm - 11:59 pm
YUL
-
SDF
5h 12m
1 stop
$505WestJet
Wed, Nov 11 - Sat, Nov 14
Delta Logo
7:20 am - 12:15 pm
SDF
-
YUL
4h 55m
1 stop
Delta Logo
12:45 pm - 9:41 pm
YUL
-
SDF
8h 56m
1 stop
$515Delta
Sat, Aug 1 - Tue, Aug 25
United Airlines Logo
10:05 am - 2:40 pm
SDF
-
YUL
4h 35m
1 stop
United Airlines Logo
3:25 pm - 8:13 pm
YUL
-
SDF
4h 48m
1 stop
$527United Airlines
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.

What is the cheapest month to fly from Louisville to Ontario?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Louisville to Ontario, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Louisville to Ontario is June, when tickets cost $240 (return) on average. On the other hand, the most expensive months are November and September, when the average cost of round-trip tickets is $842 and $591 respectively.

Good to know

Low seasonMarch
Cheapest flight$192
Best time to beat the crowds with an average 33% drop in price.
Most popular time to fly and prices are also 33% lower on average.
Flight from Louisville to Ottawa

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 3 airlines serving 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.
7.8
DeltaOverall score based on 8462 reviews
8.1Boarding
8.5Crew
7.8Comfort
7.8Entertainment
7.2Food
Airline reviews

The staff was fine. The plane was extremely tight, and I paid for the wifi and it did not work at all. I was actually going to ask for a refund.

4.0 OkayNicole, Feb 2026
SDF - LGA
Read more Delta reviews

The staff was fine. The plane was extremely tight, and I paid for the wifi and it did not work at all. I was actually going to ask for a refund.

After a 5 hour delay waiting at the gate (3 delays adding up) with no clear reason provided, we finally boarded flew 3/4 of the way to Toronto then were turned back to New York. As we neared New York, the pilot declared that it was his fault, something to do with timing and him not being allowed into the country???? How could the airline let his happen? They had hours to prepare and make sure they had a crew available for the flight! We ended up in Toronto a day late with no sleep.

Rode in a smaller plane and short trip meant no snacks, no free wifi or tv. It was only 30min flight so honestly wasn’t a big deal to lack these items.

Overall, terrible. Flight from SFO was delayed due to “air traffic control issues”, and we were all mislead about connecting flights. Told “you have 20 minutes to catch your connection”. Reality was 5. We got to watch the plane sit at the bridge. Won’t fly Delta with a connection again.

We were forced to wait nearly 50 additional minutes before leaving the terminal.

Left on time and arrived early this extending our 31 minute transfer. Bags made it also!

I appreciated friendly service from check-in, to boarding, to in-flight amenities! Attendants were accommodating and helpful. Thank you! Elaine

The crew was very polite as I have a few handicaps and everything was made pleasant. Check-in was easy as I was brought on board by the wheelchair assistant. One flight attendant did make sure my personal item was carefully stored under the seat in front of me. I was made to feel welcome as a customer as I made my first trip with a few disabilities. Entertainment and wifi worked quite well. The only food service were snacks and drinks. Those were okay. Overall it was a very smooth flight and encouraged me to use Delta again.

Forced to check my bag which fit in carry on, boarded and then sat for over an hour waiting to take off with no explanation.

Did not get a vegetarian option in 1st class and the video was not working.

Entertainment kept turning itself off. Gave up on watching a movie.

Wifi took a while to kick in and we had a maintenance issue that took over 40 mins at the gate in Washington before pulling back

Not United Airlines' fault. It's ORL airport's fault.

United overall experience is great these days. Airport experience was very organized. Staff on flight were great. App and information as good as it gets.

Very nice flight love the small aircraft. We had a wonderful flight attendant. Nice to see someone that really enjoys her job. Don't have her name but had a southern accent.

Seats in waiting area and on plane hard as rock. Fast internet on the flight was great! Crew was kind.

Not the fault of United—weather, reroute around weather, time sitting on tarmac, arrived couple hours late, too late for train into city necessitating a much pricier cab but weather…can’t be helped.

I had no checked baggage but was required to hand over carry on baggage at the door of the plane. There was a lot of overboard space in the plane and I was one of the last ones. I ran to get my carry on but it was gone. I was given back at the plane door in Toronto, so the wait was not as long as it would have been at the carousel.

the delay for 3 hours was understandable due to weather conditions but the flight should’ve provided some on flight compensations or at least provide more food.

I do prefer to fly United and have always had excellent service, except for bad weather. Flights are on time and staff is alway curtious and helpful

Better perks for corporate employees whom travel often and spend a lot of money with the airlines. Snacks were terrible chips crackers are ideas. Flight and crew were great comfort was fine entertainment not so great so so called status members means nothing

Flight had mechanical issues and it was delayed 30 mins - some of us boarded and then had to deplane.

Delayed flight. Missed connection, AA put us on a later connecting flight. The connection flight was delayed 4 times and we had to deplane. Didnt get home until 3am, when I was supposed to be home at 8:30p. Zero compensation offered from American. I would not fly them again.

Flight was late and boarding was confusing because gate changed and I didn’t get a notification

The AA app really sucks ... Every flight & connecting flights were delayed over 30 mins. One connecting flight on American Eagle said it was delayed in its arrival ... when it was actually parked across from the gate for over 1 hr before they pulled it to the gate. Seats in the economy/ main cabin are packed together like sardines ... no leg room.

Was a normal flight but it was delayed, and there wasn't an explanation.

To start, I’d like to say that every American Airline personnel I interacted with on the ground, especially flight crew, was very friendly and did their best to help me out. Despite this, however, my experience with the airline was an entire mess. The 7:19 PM flight was heavily delayed due to weather, and pushed to 10:30 AM the next morning. Because of this, I had to spend the night inside of the airport. At some point later in the night, I got an email saying that the flight had been canceled. I called the support number, and the representative on the other line told me that the flight was still on and that I didn’t need to rebook. The next morning, no one came to the gate to open the door for the crew until almost 11 AM. By this time the flight crew had been waiting for over an hour, and they had called management to get someone to open the door for them multiple times. Around 11:30, the gate screen had changed to a different flight. I ended up buying a last minute ticket with Southwest airline just to get to Chicago, because the next flight with American wasn’t until 7:19 pm that day. Now, earlier that morning my suitcase had been sent ahead of me to ORD. I went to baggage claim to ask them if I could have my suitcase forwarded to where I was staying. The representative at SDF baggage claim said they could and put the claim in for me. As I was going back through TSA, I got an email that the airline had found my suitcase, but the next step was to send it BACK to SDF. I called the airline support number again, and I made it clear that my suitcase needed to stay in Chicago and to not come back to SDF. The representative told me that they would hold my suitcase at ORD and that it wasn’t going to be forwarded anywhere. Once I got there, I found that they had loaded my suitcase onto a plane to send it back to SDF. Thankfully, I had gotten to the baggage claim counter in time for them to put in a request to bring my suitcase back up. My refund with the airline is processing already, but because of this entire experience and miscommunication at every turn of the way, I will not book with American Airlines in the future.

Cabin was roomy enough to easily slide my carry on under the seat in front of me!

Boarding was disorganized and delayed because they overbooked and wanted people to give up seats then further delayed due to an issue with the plane. They did not load my bag and it took a day for them to return it. Flight attendant was lovely and the only positive thing about this trip.

They needed to de-ice the plane. Apparently airlines have a problem keeping their de-icing vehicles in good repair. After we backed away from the gate we sat and didn't move for nearly an hour. Nearly an HOUR with minimal communication from the flight crew. Eventually the sun took care of what American Airlines could not and melted the minimal ice. We finally took of a hour late which, in turn, jacked up our connection in Chicago.

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

Information on your arrival and departure airports