SDF - ONT

$144 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 8/12. 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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Everything you should know

Cheapest round-trip
$287
Typical prices: $351-$450
Delta
Sat 9/26Sat 10/3
SDF - ONT • 1 stop
Cheapest one-way
$144
Typical prices: $234-$258
Southwest
Wed 8/12
SDF - ONT • 1 stop
Top airlines
Cheapest • from $287 (round-trip)
Best reviews • 7.9 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Louisville and Ontario. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Cheapest • Avg $468 (round-trip)
Shortest trip • 5h 30m (one-way)
Insights
Insights
Insights
Insights
When to travel
Cheapest • 30% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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We hope you love your trip to Ontario!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Louisville to Ontario (SDF-ONT)

 
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

Sat, Sep 26 - Sat, Oct 3
Delta Logo
7:05 am - 11:07 am
SDF
-
ONT
7h 02m
1 stop
Delta Logo
12:17 pm - 11:59 pm
ONT
-
SDF
8h 42m
1 stop
$287Delta
Tue, Jul 21 - Wed, Jul 22
Delta Logo
7:05 am - 10:38 am
SDF
-
ONT
6h 33m
1 stop
Delta Logo
10:00 pm - 8:54 am
ONT
-
SDF
7h 54m
1 stop
$289Delta
Tue, Sep 15 - Tue, Sep 15
Southwest Logo
12:10 pm - 5:35 pm
SDF
-
ONT
8h 25m
2 stops
Southwest Logo
11:55 pm - 11:20 am
ONT
-
SDF
8h 25m
1 stop
$292Southwest
Wed, Sep 16 - Mon, Sep 28
Delta Logo
7:05 am - 11:07 am
SDF
-
ONT
7h 02m
1 stop
Delta Logo
10:00 pm - 8:51 am
ONT
-
SDF
7h 51m
1 stop
$302Delta
Wed, Aug 5 - Sat, Aug 8
Southwest Logo
12:10 pm - 10:00 pm
SDF
-
ONT
12h 50m
1 stop
Southwest Logo
11:55 pm - 10:25 am
ONT
-
SDF
7h 30m
1 stop
$306Southwest
Thu, Aug 6 - Mon, Aug 10
Southwest Logo
11:05 am - 3:05 pm
SDF
-
ONT
7h 00m
1 stop
Southwest Logo
2:40 pm - 11:05 pm
ONT
-
SDF
5h 25m
1 stop
$315Southwest
Wed, Aug 5 - Sat, Aug 8
Southwest Logo
12:10 pm - 5:35 pm
SDF
-
ONT
8h 25m
2 stops
Southwest Logo
11:55 pm - 10:25 am
ONT
-
SDF
7h 30m
1 stop
$320Southwest
Wed, Oct 7 - Sat, Oct 10
Southwest Logo
5:00 pm - 9:40 pm
SDF
-
ONT
7h 40m
1 stop
Southwest Logo
11:55 pm - 10:15 am
ONT
-
SDF
7h 20m
1 stop
$339Southwest
Tue, Aug 4 - Sat, Aug 8
American Airlines Logo
6:38 am - 12:02 pm
SDF
-
ONT
8h 24m
2 stops
American Airlines Logo
12:33 pm - 10:17 pm
ONT
-
SDF
6h 44m
1 stop
$344American Airlines
Wed, Jul 29 - Mon, Aug 10
Delta Logo
4:47 pm - 9:50 pm
SDF
-
ONT
8h 03m
1 stop
Delta Logo
10:00 pm - 10:32 am
ONT
-
SDF
9h 32m
1 stop
$354Delta
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 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 Ontario departing in September.

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 October, where tickets cost $332 (return) on average. On the other hand, the most expensive months are November and December, where the average cost of round-trip tickets is $656 and $607 respectively.

Good to know

Low seasonJanuary
Cheapest flight$144
Best time to beat the crowds but there is an average 17% increase in price.
Flight from Louisville to Ontario

When to book flights from Louisville to Ontario

Are your dates flexible? Find out the best times to travel from Louisville to Ontario based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Louisville to Ontario

  • What is the cheapest flight from Louisville to Ontario?

    In the last 5 days, the lowest price for a flight from Louisville to Ontario was $144 for a one-way ticket and $287 for a round-trip.

  • Do I need a passport to fly between Louisville and Ontario?

    No

  • Which aircraft models fly most regularly from Louisville to Ontario?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Louisville to Ontario?

    Star Alliance, and oneworld are the airline alliances operating flights between Louisville and Ontario, with Star Alliance being the most commonly used for this route.

  • Which is the best airline for flights from Louisville to Ontario, Southwest or United Airlines?

    The two airlines most popular with KAYAK users for flights from Louisville to Ontario are Southwest and United Airlines. With an average price for the route of $476 and an overall rating of 7.9, Southwest is the most popular choice. United Airlines is also a great choice for the route, with an average price of $607 and an overall rating of 7.4.

  • 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 to Ontario from Louisville 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 to Ontario with an airline and back to Louisville with another airline. Booking your flights between Louisville and ONT can sometimes prove cheaper using this method.

  • 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 to Ontario from Louisville 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.
7.9
SouthwestOverall score based on 4250 reviews
8.1Boarding
8.0Comfort
8.6Crew
7.0Food
7.5Entertainment
Airline reviews

The flight was late. The crew was rude. There was no food. Cramped and uncomfortable. Nothing about this flight was good.

2.0 MediocreIrene, Jun 2026
DEN - SFO
Read more Southwest reviews

The flight was late. The crew was rude. There was no food. Cramped and uncomfortable. Nothing about this flight was good.

It was just okay, no frills, basic transportation with no luxury. No screens on the seats, no water or drinks on a short flight. Full flight but at least it was on time.

The first time I flew in the extra legroom section. It was difficult to notice a difference. I had bad luck with my neighbors. The crew was okay. Southwest has reduced the live TV options.

No gluten free snacks. Seats felt worn or bare bones even though it was a new 737 MAX 8.

Plane was clean and comfortable. Flight attendants and gate staff were professional, friendly and efficient. Boarding and deplaning were orderly and efficient. All in all, the typical excellent Southwest experience.

Not having a five hour delay with little notice! The crew was very kind, though, and just as tired as we passengers were. The flight didn't depart until nearly 1 am...and no reason was ever given.

This leg was much better, but we did have to have a 3 hour lay o er after coming from a very exhausting hiccup with our flight from BNA to Den

The Air hostess were very rude on my flight from Houston to Austin . Their regular communication itself felt a they are shouting at people.

Our flight to Oakland was great bc the plane was new but it was delayed by 15min not bad at all. Over all it was an 8/10

The flight in it self was good. The delays looking for pilots was unexpected.

Know that the movies that you are going to be offered are the oldest be rated movies they could possibly get. They may have one or two new movies that they keep advertising but when you’re flying 15 hours, there is nothing to see past the first new movie.

This was an overnight flight, and in the morning they did know coffee service. How you can throw passengers in a San Francisco airport at 5:40 a.m. in the morning and not giving them Coffee is a crime.

Our flight was delayed several Times due to mechanical issues. Although I understand this may happen at times, it was very inconvenient and we had to book a hotel for an overnight stay. We were traveling with my 3-yo grandson and waiting at the airport from noon until 6:30pm with no reassurance that our next rescheduled flight would depart, we had to decide what’s best for him. A day later, I found out that I may be able to demand compensation if my flight is delayed more than 4 hours. I will hav to read the fine print next time.

Service was professional and quick. Premium economy seat was comfortable given the class

Like: departed and arrived on time. Unlike: Food options for purchase allways bad, 1 of 2 of the crew members not very friendly at all. Seats and leg room aweful. At this point I am thinking on switching to AA.

The staff was extremely helpful and friendly at all times! They went above and beyond to get us into an earlier flight in San Diego to make our connection in SFO possible, because our original flight did actually not make it! I did so much appreciate the UA team and how they made this possible. We also didn’t have seats together on the long flight to Singapore, but they found us seats together last moment with no additional cost! Nobody sat next to us, so that we were able to sleep! Thanks to UA for improving their service and Underpricer for booking this trip! Please be careful: 1,5 hrs for transfer in San Francisco might not be enough time in the future

Packed flight, which makes it tough on crew and boarding staff (and the customers of course). But this was great boarding, clear instructions, etc. Traveling on the weekends are always fraught with danger as you have families and less frequent flyers thus more confusion. But this flight went as planned.

Destroyed my suitcase. Tired of talking about it. Cancelling my unite mileage plus account.

New plane was lovely. Crew customer service is always lax but expected. Kraft on time and arrived safely.

Airline did not explain reasons why flight was delayed two hours. Explanations were badly needed and rarely provided. Problem seemed to clearly be the airline’s fault and not the fault of the weather or airport.

The flight attendant was very polite and attentive. The food was good.

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

Smooth flight. From the early boarding and all were on board before departure time and arrived early in ONT. Great crew. Thank you!!!!

Amazing I love American. I’ll never fly anyone else if I can help it.

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.

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!

Everything was great except for the wifi was junk. Crew was super friendly and helpful

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.

It was fine. I didn't love the food but it was at least a real attempt at serving a meal, unlike my earlier flight from Nashville to Dallas.

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

Information on your arrival and departure airports