ONT - SDF

$144 Find Cheap Flights from Ontario to Louisville

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ontario to Louisville departing on 9/8. 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 Louisville

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Ontario to Louisville, 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 Ontario to Louisville, as well as popular online travel agencies
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 21% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Everything you should know

Cheapest round-trip
$287
Typical prices: $363-$583
American Airlines
Wed 8/5Tue 8/11
ONT - SDF • 1 stop
Cheapest one-way
$144
Typical prices: $171-$513
Southwest
Tue 9/8
ONT - SDF • 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 Ontario and Louisville. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Cheapest • Avg $406 (round-trip)
Shortest trip • 6h 00m (one-way)
Insights
Insights
Insights
Insights
When to travel
Cheapest • 24% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Louisville!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Ontario to Louisville (ONT-SDF)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to Louisville 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 Ontario to Louisville

Wed, Aug 5 - Tue, Aug 11
American Airlines Logo
12:33 pm - 10:17 pm
ONT
-
SDF
6h 44m
1 stop
American Airlines Logo
7:03 am - 11:43 am
SDF
-
ONT
7h 40m
1 stop
$287American Airlines
Tue, Jul 28 - Tue, Aug 4
American Airlines Logo
11:59 pm - 10:39 am
ONT
-
SDF
7h 40m
1 stop
American Airlines Logo
7:50 pm - 11:59 pm
SDF
-
ONT
7h 09m
1 stop
$288American Airlines
Wed, Aug 5 - Tue, Aug 11
American Airlines Logo
6:00 am - 6:18 pm
ONT
-
SDF
9h 18m
1 stop
American Airlines Logo
7:03 am - 11:43 am
SDF
-
ONT
7h 40m
1 stop
$289American Airlines
Tue, Aug 4 - Tue, Aug 11
American Airlines Logo
7:15 pm - 10:35 am
ONT
-
SDF
12h 20m
2 stops
American Airlines Logo
7:03 am - 11:43 am
SDF
-
ONT
7h 40m
1 stop
$292American Airlines
Tue, Jul 28 - Tue, Aug 4
American Airlines Logo
11:59 pm - 10:39 am
ONT
-
SDF
7h 40m
1 stop
American Airlines Logo
6:38 am - 12:02 pm
SDF
-
ONT
8h 24m
2 stops
$293American Airlines
Sat, Aug 1 - Wed, Aug 5
Southwest Logo
5:30 am - 2:15 pm
ONT
-
SDF
5h 45m
1 stop
Southwest Logo
12:10 pm - 10:00 pm
SDF
-
ONT
12h 50m
1 stop
$294Southwest
Tue, Sep 1 - Tue, Sep 22
Southwest Logo
9:40 am - 8:35 pm
ONT
-
SDF
7h 55m
2 stops
Southwest Logo
7:05 am - 12:30 pm
SDF
-
ONT
8h 25m
2 stops
$297Southwest
Tue, Jul 28 - Tue, Aug 4
American Airlines Logo
7:15 pm - 10:39 am
ONT
-
SDF
12h 24m
2 stops
American Airlines Logo
6:38 am - 12:02 pm
SDF
-
ONT
8h 24m
2 stops
$299American Airlines
Tue, Aug 4 - Mon, Aug 10
Southwest Logo
1:50 pm - 10:30 pm
ONT
-
SDF
5h 40m
1 stop
Southwest Logo
4:15 pm - 7:25 pm
SDF
-
ONT
6h 10m
1 stop
$301Southwest
Tue, Aug 11 - Thu, Aug 13
Southwest Logo
1:50 pm - 10:30 pm
ONT
-
SDF
5h 40m
1 stop
Southwest Logo
3:20 pm - 8:20 pm
SDF
-
ONT
8h 00m
2 stops
$306Southwest
Booking Insights

KAYAK's insights & trends for Ontario to Louisville flights

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

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

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

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ontario to Louisville, 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 Ontario to Louisville is July, where tickets cost $407 (return) on average. On the other hand, the most expensive months are January and June, where the average cost of round-trip tickets is $976 and $553 respectively.

Good to know

Low seasonJanuary
Cheapest flight$144
Best time to beat the crowds but there is an average 81% increase in price.
Most popular time to fly and prices are also 14% lower on average.
Flight from Ontario to Louisville

When to book flights from Ontario to Louisville

Are your dates flexible? Find out the best times to travel from Ontario to Louisville 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 Ontario to Louisville

  • What is the cheapest flight from Ontario to Louisville?

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

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

    A passport is not required to fly from Ontario to Louisville.

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

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

  • Which airline alliances offer flights from Ontario to Louisville?

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

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

    The two airlines most popular with KAYAK users for flights from Ontario to Louisville are Southwest and Delta. With an average price for the route of $477 and an overall rating of 7.9, Southwest is the most popular choice. Delta is also a great choice for the route, with an average price of $522 and an overall rating of 7.8.

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

    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 Ontario to Louisville.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Louisville from 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 Ontario to Louisville?

    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 Louisville with an airline and back to Ontario with another airline. Booking your flights between Ontario and SDF 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 Ontario to Louisville?

    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 Louisville from Ontario up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 4 airlines serving from Ontario to Louisville

 
See real verified KAYAK customer reviews for airlines flying from Ontario to Louisville. 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 Ontario to Louisville? 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 4246 reviews
7.5Entertainment
8.1Boarding
8.6Crew
7.0Food
8.0Comfort
Airline reviews

Great job Southwest! My family doesn't fly often but we felt safe the whole time.

10.0 ExcellentK, Jun 2026
SAN - AUS
Read more Southwest reviews

Great job Southwest! My family doesn't fly often but we felt safe the whole time.

Flight was delayed, full flight and I had to change gates. Southwest flights are always late later in the day.

Was fine, delayed and feels like southwest is always late

The entire experience from boarding to landing was amazing! The crew were very friendly. Will definitely be back.

Delayed flight, lack of information, boarding process is a mess as is the carryon luggage causing issues when leaving the plane….just a poor experience.

Comfortable. Easy. No problems. Just wish they had gf options for snacks.

The crew was very kind and made going to Hawaii relaxing and fun to look forward to! Thank you Southwest for a pleasant flight!

The seats were a bit cramped and worn, but otherwise okay.

Since the flight wasn’t full, we had some extra room. Crew was great

I liked receiving attention from aged and well experienced flight attendants. I disliked the non-gluten-free snack but I brought my own so I was OK.

It was as good as it could be. Flying is not a pleasant experience these days.

Very good flight. Crew was great. No issues and we even arrived early.

Be on time? When not on time a circling for over an hour offer more than 1 bag of chips to the passengers? It was a 7 hour flight by the time we got done.

Flight delayed four separate times. I’m now one hour hours late to landing.

Lady Pilot was perfect in every way wheels up to wheels down communication, professionalism, excellent on time departure and on time arrival, excellent communication! Fantastic job with Superb attitude!!

It was a great flight and the stewards and stewardess were all kind and accommodating!! The seats were comfortable and entertainment screen excellent!

737-800 in first class was pretty dumpy. Seat had an uncomfortable angle, storage under the seat was blocked so even my very modest backpack didn't fit, power outlet was flaky. Weird tiny seat pockets that couldn't hold a gallon ziploc bag, emesis bag missing, etc. etc. No in-flight service due to turbulence. Crew was excellent, boarding was smooth despite a full flight.

The flight was overbooked and the staff at the gate started calling for volunteers to drop out and offering incentives. That delayed the flight

There was no wifi even after my husband paid for wifi it wasn’t working. The plane looked and felt old.

Update the cabin with tv screens or at least music sources.

Great staff. Clean plane, but we were delayed for more than an hour due to maintenance issues and had to board another plane.

Lost one piece of luggage even though I checked in 2.5 hours before the flight

The boarding process on the departure from LA was rather slow even though I was in Group 1. For first class, I was not expecting to have to pay for Wi-fi but I did and then the wi-fi was spotty. The entree was surprisingly good and so that was a pleasant surprise. However, once I got to Houston, it was terrible. Unfortunately there was bad weather but the constant gate changes for my connecting flight was difficult to manage due to having to navigate back and forth between different terminals.

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

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

Over 2.5 hour maintenance delay on first morning flight with no acknowledgement, compensation or even gesture of good will. Aircraft had overnighted at airport so issue should have been addressed prior to boarding. Over 3.5 hours before first slow and deliberate beverage service.

Horrifying Almost 2 million miles. Bring your own food and drink. One coffee or drink every three hours. Have to order meals on app more than 24 hours ahead Tiny and dirty bathrooms

Flight was delayed but more than 90 minutes. This caused me to miss my available windows for pick-up by a friend. I had to pay $125 for an uber back home from the airport which was an added expense that I had not budgeted for my trip. Staff was friendly.

Seat pitch is horrible especially on the 15 hour flight. Gate crew at SFO was Outstanding. The flight crew was also great.

Short flight, but no drink/snack service. The flights both going and coming were delayed.

Ontario airport boarding was very easy to park and access, is clean and TSA took 10 minutes total. Check-in was a breeze and cruise was very nice.

Good flight, seated and had a water within 5 minutes. Crew was hospitable.

The gate got changed several times and the flight was delayed over an hour. Awful experience

It was an older plane. First Class was not especially roomy or comfortable. It was a short flight so there were no meal but they did offer mixed nuts which used to be normal but now is rare. Crew member was very polite and professional.

No Snacks or Entertainment. The flight was short, snacks should still be given.

The flight was on time and arrived early. The crew were friendly and helpful.

The chair cushions may need an upgrade. I have been noticing they are so worn out, thin so you’d sit in a dip 😄. Other than that, all was an enjoyable trip. Thanks AA!

Everything was fine. Flight boarded and departed on time. Seating was spacious enough for my carryon to fit under the seat in front of me. No complaints at all. Flight even arrived early.

Boston ticket agent Cheryl Porter is WONDERFUL. Our Iberia flight to Barcelona was cancelled the morning we were scheduled to leave and Cheryl was our super hero - she found us seats on a flight to London and on to Barcelona. Truly a “can-do” attitude which we appreciated so much after the Iberia ticket agents told us there was “absolutely nothing they could do”. (As did the customer service agents at Iberia’s call center) Ms Porter is truly a wonderful person who genuinely cares about travelers!

Nothing wrong on this flight but nothing special. It was oversold and they had to bump people which is always bad.

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

Information on your arrival and departure airports