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SDF - ONT

Find cheap flights from Louisville to Ontario from $204

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 5/26. 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
0 bags
Mon 6/3
Mon 6/10

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 43,369,418 times on KAYAK, and here is why:

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Cheap flight deals 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 and deals for you by selecting your travel dates.
Choose your dates
6:00 am - 11:40 amSDF-ONT
8h 40m1 stop
10:00 pm - 10:03 amONT-SDF
9h 03m1 stop
$428Delta
Find Deal
Thu, May 30 - Tue, Jun 11
7:35 am - 11:10 amSDF-ONT
6h 35m1 stop
7:00 am - 5:45 pmONT-SDF
7h 45m1 stop
$432Delta
Find Deal
Sat, Aug 10 - Tue, Aug 13
2:59 pm - 7:05 pmSDF-ONT
7h 06m1 stop
10:59 pm - 9:31 amONT-SDF
7h 32m1 stop
$448Delta
Find Deal
Thu, Aug 8 - Mon, Aug 12
7:35 am - 11:10 amSDF-ONT
6h 35m1 stop
10:59 pm - 9:31 amONT-SDF
7h 32m1 stop
$452Delta
Find Deal
Sat, Aug 10 - Mon, Aug 12
3:35 pm - 8:48 pmSDF-ONT
8h 13m1 stop
1:35 pm - 10:28 pmONT-SDF
5h 53m1 stop
$498United Airlines
Find Deal
Wed, Jul 17 - Tue, Jul 23
3:28 pm - 8:48 pmSDF-ONT
8h 20m1 stop
5:15 am - 10:18 pmONT-SDF
14h 03m1 stop
$515United Airlines
Find Deal
Fri, May 31 - Wed, Jun 5
8:38 pm - 11:49 pmSDF-ONT
6h 11m1 stop
10:48 am - 10:35 pmONT-SDF
8h 47m1 stop
$516American Airlines
Find Deal
Mon, Jul 15 - Sat, Jul 20
8:38 pm - 11:49 pmSDF-ONT
6h 11m1 stop
6:15 am - 7:53 pmONT-SDF
10h 38m2 stops
$521American Airlines
Find Deal
Mon, Jul 15 - Sat, Jul 20
10:46 am - 11:59 pmSDF-ONT
16h 13m2 stops
6:00 am - 10:44 pmONT-SDF
13h 44m2 stops
$791Alaska Airlines
Find Deal
Tue, Jun 25 - Tue, Jul 2
6:01 am - 4:05 pmSDF-ONT
13h 04m2 stops
6:00 am - 10:58 pmONT-SDF
13h 58m2 stops
$846Alaska Airlines
Find Deal
Tue, May 14 - Sun, May 19

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 October, where tickets cost $262 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 ($428) and United Airlines ($498). American Airlines proposed the cheapest one-way flight at $204.

Good to know

Low season

January

High season

May

Cheapest flight

$204
Best time to beat the crowds but there is an average 5% 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 $204 for a one-way ticket and $428 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?

    oneworld, Star Alliance, and SkyTeam 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 American Airlines?

    The two airlines most popular with KAYAK users for flights from Louisville to Ontario are Delta and American Airlines. With an average price for the route of $464 and an overall rating of 8.0, Delta is the most popular choice. American Airlines is also a great choice for the route, with an average price of $578 and an overall rating of 7.3.

  • 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 10838 reviews
8.6Crew
8.0Entertainment
7.4Food
8.2Boarding
7.9Comfort
Airline reviews

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

6.0 GoodEliza, Apr 2024SAN - LAX
Read more about Delta reviews

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

Crew was not friendly when I went to request a seat change.

Really impressive staff at airport and on plane, especially given how busy it was

Was a great smooth flight from Detroit to San Diego.

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.

On time every leg of the journey and exceptional staff at counter, gate, and on board. I haven’t travelled in US for a long time and was genuinely surprised how pleasant this was.

This was a Lufthansa flight. Disappointing main meal. Very rough over Canada and arrival at FRA. IFE was almost unusable.

Too many fees (but that seems to apply to all airlines nowadays)

For a 22 minute flight all you expect is for it to be safe and comfortable

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 attended to my needs as I couldn't walk and they provided a wheelchair for me.q

Poor availability of food. Cold cabin temperature. Extremely long waiting time for a flight attendant to respond to a call button signal.

2.5h delay due to unruly passenger in first class. Had to be removed from the flight. No food unless pre ordered. Didn't know we would need it because of delay.

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.

First flight delayed and spirit didn’t let me on my connecting flight even though I made it on time because they overbooked and gave away my seat.

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.
5/26Sun
1 stopAmerican Airlines
6h 51mSDF-ONT
$204
5/29Wed
2 stopsAmerican Airlines
9h 46mSDF-ONT
$208
6/25Tue
1 stopUnited Airlines
8h 20mSDF-ONT
$249
6/8Sat
1 stopUnited Airlines
8h 10mSDF-ONT
$258
6/8Sat
2 stopsDelta
12h 15mSDF-ONT
$263
5/26Sun
2 stopsAmerican Airlines
9h 46mSDF-ONT
$273
5/29Wed
2 stopsUnited Airlines
16h 29mSDF-ONT
$278
7/14Sun
2 stopsSouthwest
9h 20mSDF-ONT
$283
7/13Sat
2 stopsSouthwest
11h 55mSDF-ONT
$378
5/12Sun
1 stopDelta
8h 03mSDF-ONT
$388

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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.
5/7Tue
multi-stopAmerican Airlines
6h 31mSDF-ONT
5/8Wed
multi-stopAmerican Airlines
6h 32mONT-SDF
$736
5/5Sun
multi-stopUnited Airlines
7h 10mSDF-ONT
5/6Mon
multi-stopUnited Airlines
6h 17mONT-SDF
$785
5/6Mon
multi-stopUnited Airlines
8h 23mSDF-ONT
5/8Wed
multi-stopUnited Airlines
6h 41mONT-SDF
$1,166
5/7Tue
multi-stopAlaska Airlines
13h 38mSDF-ONT
5/8Wed
multi-stopAlaska Airlines
13h 58mONT-SDF
$2,131
5/5Sun
multi-stopAlaska Airlines
14h 15mSDF-ONT
5/6Mon
multi-stopAlaska Airlines
11h 40mONT-SDF
$2,407
5/5Sun
multi-stopUnited Airlines
8h 23mSDF-ONT
5/6Mon
multi-stopUnited Airlines
6h 17mONT-SDF
$2,413
5/6Mon
multi-stopAlaska Airlines
13h 04mSDF-ONT
5/8Wed
multi-stopAlaska Airlines
11h 50mONT-SDF
$3,236

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Louisville - Ontario Flights

Departure:

Louisville (SDF)United States

Destination:

Ontario (ONT)United States

Return flight deals:

Ontario - Louisville

Cabin classes: