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SDF - ONT

$188 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 8/15. 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
0 bags
Sat 6/29
Sat 7/6

Search 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
In the last 7 days travelers have searched 42,686,544 times on KAYAK, and here is why:

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Cheap flight deals from Louisville to Ontario (SDF-ONT)

 
These are the cheapest deals for flights from Louisville to Ontario currently on KAYAK along with options from the most popular airlines KAYAK users selected for this route. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.

Recent round-trip flight deals from Louisville to Ontario

Recommended round-trip deals departing in the coming months from the most popular airlines that fly from Louisville to Ontario.

Recent one-way flight deals from Louisville to Ontario

Only flying one-way? Below are some of the best one-way flight deals from Louisville to Ontario found on KAYAK recently.

Recent last minute flight deals from Louisville to Ontario

Leaving soon but still want a bargain? Check out these latest deals for last minute flights from Louisville to Ontario.

Recent direct flight deals from Louisville to Ontario

The latest deals for direct flights from Louisville to Ontario so you can sit back and relax without the need for a layover.

Cheap bus & train deals from Louisville to Ontario

Find recent round-trip train or bus tickets from Louisville to Ontario.

All round-trip flight deals to Ontario

The cheapest plane tickets to Ontario found on KAYAK recently.
Discover the best prices and deals for you by selecting your travel dates.
Choose your dates
3:27 pm - 7:27 pmSDF-ONT
7h 00m1 stop
10:00 pm - 9:54 amONT-SDF
8h 54m1 stop
$376Delta
Find Deal
Wed, Jul 17 - Sat, Jul 27
6:00 am - 10:13 amSDF-ONT
7h 13m1 stop
11:23 am - 10:24 pmONT-SDF
8h 01m1 stop
$427Delta
Find Deal
Wed, Jul 17 - Tue, Jul 23
5:55 pm - 11:00 pmSDF-ONT
8h 05m1 stop
10:00 pm - 10:03 amONT-SDF
9h 03m1 stop
$447Delta
Find Deal
Sun, Jun 16 - Tue, Jun 25
6:00 pm - 11:00 pmSDF-ONT
8h 00m1 stop
11:30 am - 12:15 amONT-SDF
9h 45m1 stop
$476Delta
Find Deal
Fri, Jun 28 - Fri, Jul 5
9:15 am - 12:33 pmSDF-ONT
6h 18m1 stop
1:30 pm - 10:28 pmONT-SDF
5h 58m1 stop
$478United Airlines
Find Deal
Mon, Jul 1 - Fri, Jul 5
3:19 pm - 10:59 pmSDF-ONT
10h 40m1 stop
2:44 pm - 12:05 amONT-SDF
6h 21m1 stop
$493American Airlines
Find Deal
Tue, Jun 11 - Wed, Jun 12
10:50 am - 8:48 pmSDF-ONT
12h 58m2 stops
1:35 pm - 10:28 pmONT-SDF
5h 53m1 stop
$496United Airlines
Find Deal
Sat, Aug 10 - Tue, Aug 13
3:19 pm - 9:40 pmSDF-ONT
9h 21m2 stops
2:44 pm - 12:05 amONT-SDF
6h 21m1 stop
$498American Airlines
Find Deal
Tue, Jun 11 - Wed, Jun 12
10:46 am - 7:15 pmSDF-ONT
11h 29m2 stops
4:24 pm - 10:21 amONT-SDF
14h 57m2 stops
$616Alaska Airlines
Find Deal
Fri, Aug 9 - Fri, Aug 16
6:00 am - 3:33 pmSDF-ONT
12h 33m2 stops
4:16 pm - 10:24 amONT-SDF
15h 08m2 stops
$737Alaska Airlines
Find Deal
Sat, Sep 28 - Thu, Oct 3
6:00 am - 10:13 amSDF-ONT
7h 13m1 stop
$188Delta
Find Deal
Thu, Aug 15
6:00 am - 10:25 amSDF-ONT
7h 25m1 stop
$198Delta
Find Deal
Sat, Jul 6
8:06 am - 11:51 amSDF-ONT
6h 45m1 stop
$218American Airlines
Find Deal
Sat, Aug 3
8:06 am - 3:48 pmSDF-ONT
10h 42m2 stops
$223American Airlines
Find Deal
Sat, Aug 3
8:35 pm - 11:49 pmSDF-ONT
6h 14m1 stop
$239American Airlines
Find Deal
Mon, Aug 5
3:40 pm - 9:31 pmSDF-ONT
8h 51m1 stop
$244United Airlines
Find Deal
Tue, Aug 20
10:30 am - 9:02 pmSDF-ONT
13h 32m2 stops
$247United Airlines
Find Deal
Tue, Aug 20
2:34 pm - 11:59 pmSDF-ONT
12h 25m2 stops
$308Alaska Airlines
Find Deal
Mon, Aug 5
10:46 am - 11:59 pmSDF-ONT
16h 13m2 stops
$340Alaska Airlines
Find Deal
Sat, Jun 15
7:40 pm - 10:00 pmSDF-ONT
29h 20m3 stops
Sat, Aug 3
9:21 am - 12:33 pmSDF-ONT
6h 12m1 stop
1:29 pm - 10:18 pmONT-SDF
5h 49m1 stop
$776United Airlines
Find Deal
Sun, Jun 2 - Fri, Jun 7
11:29 am - 6:59 pmSDF-ONT
10h 30m1 stop
10:45 pm - 10:48 amONT-SDF
9h 03m1 stop
$790American Airlines
Find Deal
Tue, Jun 4 - Tue, Jun 11
11:29 am - 6:59 pmSDF-ONT
10h 30m1 stop
9:24 am - 10:28 pmONT-SDF
10h 04m2 stops
$797American Airlines
Find Deal
Tue, Jun 4 - Tue, Jun 11
11:29 am - 6:59 pmSDF-ONT
10h 30m1 stop
10:45 pm - 10:43 amONT-SDF
8h 58m1 stop
$815American Airlines
Find Deal
Sun, Jun 2 - Fri, Jun 7
2:34 pm - 10:29 pmSDF-ONT
10h 55m2 stops
10:45 pm - 10:43 amONT-SDF
8h 58m1 stop
$822American Airlines
Find Deal
Sun, Jun 2 - Fri, Jun 7
2:34 pm - 10:29 pmSDF-ONT
10h 55m2 stops
9:24 am - 10:28 pmONT-SDF
10h 04m2 stops
$828American Airlines
Find Deal
Sun, Jun 2 - Fri, Jun 7
11:29 am - 6:59 pmSDF-ONT
10h 30m1 stop
2:50 pm - 11:57 pmONT-SDF
6h 07m1 stop
$837American Airlines
Find Deal
Sun, Jun 2 - Tue, Jun 4
11:29 am - 6:59 pmSDF-ONT
10h 30m1 stop
9:30 am - 11:57 pmONT-SDF
11h 27m2 stops
$842American Airlines
Find Deal
Sun, Jun 2 - Tue, Jun 4
2:34 pm - 10:29 pmSDF-ONT
10h 55m2 stops
12:53 pm - 11:57 pmONT-SDF
8h 04m2 stops
$848American Airlines
Find Deal
Sun, Jun 2 - Tue, Jun 4
6:01 am - 3:26 pmSDF-ONT
12h 25m2 stops
6:00 am - 8:53 pmONT-SDF
11h 53m2 stops
$940Alaska Airlines
Find Deal
Tue, Jun 4 - Tue, Jun 11

Flights from Louisville to Ontario - Travel Insights & Trends

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’s the cheapest day of the week to fly from Louisville to Ontario?

The average price of all flights from Louisville to Ontario clicked on KAYAK for each day over the last 12 months.
For Louisville to Ontario, Saturday is the cheapest day to fly on average and Sunday is the most expensive. Flying from Ontario back to Louisville, the best deals are generally found on Saturday, with Monday being the most expensive.

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 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 August, where tickets cost $268 on average. On the other hand, the most expensive months are May and March, where the average cost of tickets is $670 and $637 respectively.

Which airlines provide the cheapest flights from Louisville to Ontario?

The cheapest price for the route for each airline clicked by KAYAK users in the last 72 hours.
In the last 72 hours, the best return deals on flights connecting Louisville to Ontario were found on Delta ($376) and United Airlines ($478). Delta proposed the cheapest one-way flight at $188.

Good to know

Low season

January

High season

May

Cheapest flight

$188
Best time to beat the crowds but there is an average 4% increase in price.
Most popular time to fly with an average 30% 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 3 days, the lowest price for a flight from Louisville to Ontario was $188 for a one-way ticket and $376 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?

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

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

    The two airlines most popular with KAYAK users for flights from Louisville to Ontario are Delta and United Airlines. With an average price for the route of $464 and an overall rating of 8.0, Delta is the most popular choice. United Airlines is also a great choice for the route, with an average price of $517 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.

See more FAQs

Top 4 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.
8.0
DeltaOverall score based on 10457 reviews
8.0Entertainment
8.2Boarding
8.6Crew
7.9Comfort
7.4Food
Airline reviews

Had to change aircraft due to a faulty door. Surprisingly it only caused about an hour and a half of delay. Delta handled this situation as well as can be expected.

8.0 ExcellentLiam, May 2024SLC - SJC
Read more about Delta reviews

Had to change aircraft due to a faulty door. Surprisingly it only caused about an hour and a half of delay. Delta handled this situation as well as can be expected.

Your crew could maybe answer the call bell at least one of the times I pressed it. I pressed it first time with 2.5 hours left in our flight bc my partner was hungry and wanted a sandwich. We finally got the sandwich with 40 mins left in the flight.

The Flight crew didn’t serve us until about 1.5 hours into the flight because of turbulence but after it ended it was fine to move around. They served us water only and snacks and then NEVER, NOT ONE TIME came through to collect trash until right before landing about 1.5 hours later. There was absolutely no need for that. They crew was just standing around talking and visiting with each other and really never tried to see if we might want something besides water or even try to come pick up trash. This is VERY unusual for a Delta flight but it was not what I would have expected for a 4 hour flight.

There was a loud squeaky sound the whole time we were flying.

Had a broken tray in business class. Crew just shrugged it off.

I didn’t like that I could not select my seat and was assigned a seat when I checked in at LAX

Great experience overall. Check in at Austin was congested as they only have about 6 check in kiosks, one was broken, and there was a lot of Spring Break travelers.

Bag drop off was slow and annoying. Only 2 agents at the entire delta desk, and no one directing traffic for what line to be in, many confused people slowed down the process. Boarding was fine. Seats in Delta comfort plus were fine. Snacks were great! Definitely a bonus. The entertainment system was awful — old, slow, not responsive, and completely unable to play games due to some kind of error. But on the other hand, thank you to Delta for the free WiFi. That made it better.

Everything was very good other than I had selected a specific seat when I booked the flight and they changed it once I checked-in the day before my flight. I was still in first class but lost my aisle seat for a window seat. Being tall, the aisle offers more comfort so I always select an aisle seat.

Flight diverted in SD. Later take off in Seattle by 1.3hrs

Dinner was okay but the breakfast was not eatable on the flight San Francisco to Zurich.

Check in etc was very good. As for on the plane, it was like flying in a freezer. It was so cold, i have flown for years and never been so cold on a plane. Staff on board said its always cold when flying which is a load of rubbish. They wouldnt put any heating on and now i have the flu because of this .

I’ve had a couple flights this week on United that were delayed by an hour or more

Should have video screens Plane audio was poor and without wired connection hard to understand crew. Should serve more than just cups of water and pretzels on six hour flight. Did not see crew rest of flight. Fix charging sockets to retain charging blocks.

Generally good but there wasn’t any staff available when my luggage didn’t appear at baggage claim in Fresno. It took about half an hour to locate a staff member to open up the locked room where it was being kept.

Do not like the feeling of being in the basic economy. Everyone should feel good no matter what.

Our original business class flight was cancelled so we not only downgraded but we were also spread out across the plane not sitting together in separate middle seats. My poor kids were scared and couldn’t see me on the flight and the crew wasn’t sensitive to the situation and what the airlines did to us. Very dissatisfied with United airlines.

The WiFi didn’t work and the seats are too close together. Very uncomfortable.

So so. Terrible aircraft choice for that leg of the flight.

delay several times and wait extra long to board. no entertainment service because there are problem for some rows. always encounter some delays for the last flight of the day.

There were delays on both ends. It made it less than excellent. This plane was great though

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

Attendants were rude. Scowling. Seats were miserable and we paid extra.

Fight crew was not very attentive and the bastions were gross!

Our flight was great we left Kona earlier and got into LAX almost an 1hour earlier as well. LAX AA is in repair so to get out and found our bus to get pick up was a bit confusing.

Plane was good but was delayed. probably not AA fault but caused a 1 hour delay. Seating was cramped.

5 hour flight - full flight - not enough room to use my computer - slightly delayed - Admirals club was excellent quality food, drink made up for flight seating. No food offerred on flight, you ahd to prebook.

We experience delays on departure and connecting flights resulting in 14 hour to our next departure. We were accommodated with a night's stay but was only provided a 12 dollar meals accommodation. The airlines rules state.at least 50 dollars. In any case, it can not make up for the whole day missed on our vacation in Sydney Australia.

I can say I will not be taking this airline again any time soon. Seat were uncomfortable and too tight. Lack of chair screen and little overhead space.

Plane felt so crowded and tightly packed. The chair itself was not comfortable.

They stuck us with multiple extra fees. I will never fly spirit again

The guy with severe body odor sat next to me. For the whole duration of the flight it was a torture. The airline should have better policy on limiting people with bad body odor to board the flight. Passengers should not be the ones to endure bad odor for the whole duration of the flight. The airline should be e the one to ensure decent air quality for ever passenger.

They charged me 212.00 for a heavy check in bag at the gate. The pricing and process was so confusing - as if it was designed to purposefully gouge customers who need to board plane. That experience combined with the outrageous price charged will prevent me from ever flying Spirit again. And I’ll be sure to tell the story to anyone who cares to hear.

The text told me it was changed to Terminal E and Gate D5. But with no one on site to ask questions there was confusion on where to go as all the gates were E's. Then we took the skyline to the D area. We left to get something to eat. No announcement was made but my daughter happened to asked and they told her our gate was moved to D12. I will not fly Spirit again.

The agent at the check in desk was absolutely rude. The rest of the team after that was good, but the check in process at LAS was miserable. The woman at the desk spoke like we were stupid and was rude throughout the process.

Its so random that they only allow 40 pounds on checked bags when all airlines take 55. They then charge you for each 10 extra pounds, so my checked suitcase was $130 and the flight $30 ... its like whattt, im for sure not traveling with Spirit again

So bad. The check in process was laborious and the check in agent didn't seem to know how to manage the process efficiently and was confused about how to check in my son's sports equipment. The baggage fees were outrageous and so expensive. $90 for a carry on bag? And $200 additional for 2 check ins. The security lines were insanely long and the terminal was not very nice in the Spirit area. $5 for a water on board. It was my first and last time flying Spirit - I tried to save $ by flying them due to the accommodating schedule but I should have paid for Southwest, because it would've actually ended up less expensive due to the free bags with Southwest. There were no charging ports on the airplane, no wifi and really uncomfortable seating. The flight crew were great though, courteous and efficient in their boarding. Flight was delayed 1 hour, but we made up 15 minutes in flight.

My experience was better than expected. What I did find not so great was the seats. Very little room, they did not recline and the tray table was the size of a post card. There was no food to try, just standard snacks that you had to pay for and I don’t know of any entertainment. I would fly again even though everything was an upcharge. Flight was on time with little disturbance

thy don't even ofer water we have to buy it for $4.49 and paid for our cary on bags $100 each we never will fly in this company again.

Super cool and laid back, three lovely ladies. Couldn’t ask for better service.

Book cheap flights from Louisville to Ontario

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from Louisville to Ontario found on KAYAK in the last 72 hours.
8/15Thu
1 stopDelta
7h 13mSDF-ONT
$188
7/6Sat
1 stopDelta
7h 25mSDF-ONT
$198
8/3Sat
1 stopAmerican Airlines
6h 45mSDF-ONT
$218
8/3Sat
2 stopsAmerican Airlines
10h 42mSDF-ONT
$223
8/5Mon
1 stopAmerican Airlines
6h 14mSDF-ONT
$239
8/20Tue
1 stopUnited Airlines
8h 51mSDF-ONT
$244
8/20Tue
2 stopsUnited Airlines
13h 32mSDF-ONT
$247
8/5Mon
2 stopsAlaska Airlines
12h 25mSDF-ONT
$308
6/15Sat
2 stopsAlaska Airlines
16h 13mSDF-ONT
$340
8/3Sat
3 stops
29h 20mSDF-ONT
$883

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Last minute flights from Louisville to Ontario

Last minute flight, train and bus deals

 
These last-minute flight deals are the cheapest flights found on KAYAK in the last 72 hours for flights from Louisville to Ontario that are departing in the next 10 days.
6/2Sun
multi-stopUnited Airlines
6h 12mSDF-ONT
6/7Fri
multi-stopUnited Airlines
5h 49mONT-SDF
$776
6/4Tue
multi-stopAmerican Airlines
10h 30mSDF-ONT
6/11Tue
multi-stopAmerican Airlines
9h 03mONT-SDF
$790
6/4Tue
multi-stopAmerican Airlines
10h 30mSDF-ONT
6/11Tue
multi-stopAmerican Airlines
10h 04mONT-SDF
$797
6/2Sun
multi-stopAmerican Airlines
10h 30mSDF-ONT
6/7Fri
multi-stopAmerican Airlines
8h 58mONT-SDF
$815
6/2Sun
multi-stopAmerican Airlines
10h 55mSDF-ONT
6/7Fri
multi-stopAmerican Airlines
8h 58mONT-SDF
$822
6/2Sun
multi-stopAmerican Airlines
10h 55mSDF-ONT
6/7Fri
multi-stopAmerican Airlines
10h 04mONT-SDF
$828
6/2Sun
multi-stopAmerican Airlines
10h 30mSDF-ONT
6/4Tue
multi-stopAmerican Airlines
6h 07mONT-SDF
$837
6/2Sun
multi-stopAmerican Airlines
10h 30mSDF-ONT
6/4Tue
multi-stopAmerican Airlines
11h 27mONT-SDF
$842
6/2Sun
multi-stopAmerican Airlines
10h 55mSDF-ONT
6/4Tue
multi-stopAmerican Airlines
8h 04mONT-SDF
$848
6/4Tue
multi-stopAlaska Airlines
12h 25mSDF-ONT
6/11Tue
multi-stopAlaska Airlines
11h 53mONT-SDF
$940

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Louisville - Ontario Flights

Departure:

Louisville (SDF)United States

Destination:

Ontario (ONT)United States

Return flight deals:

Ontario - Louisville

Cabin classes: