SDF - ONT

$171 Find Cheap Flights from Louisville to Ontario - Compare and Save

1 adult
1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$341
Typical prices: $407-$617
American Airlines
Wed 10/24Wed 10/31
SDF - ONT • 1 stop
Cheapest one-way
$171
Typical prices: $188-$366
United Airlines
Sun 10/28
SDF - ONT • 1 stop
Nonstop flights
Not available
There are currently no direct flights between Louisville and Ontario. You'll need to take a connecting flight to reach the destination.
Insights
Insights
When to travel
September
Cheapest • 18% price drop
November
Most popular
Good to know
+1
Good to know
+1
Top layover airports
Nashville Intl (BNA)
Cheapest • Avg $468 (round-trip)
Phoenix Sky Harbor Intl (PHX)
Shortest trip • 5h 44m (one-way)
Insights
Insights
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Flight Deals

Cheap Flights from Louisville to Ontario (SDF-ONT)

 
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Louisville to Ontario

Sat, Oct 24 - Sat, Oct 31
American Airlines Logo
6:00 am - 9:35 amSDF  Louisville Intl-ONT Ontario
6h 35m1 stop Dallas/Fort Worth
American Airlines Logo
12:43 pm - 11:27 pmONT  Ontario-SDF Louisville Intl
7h 44m1 stop Dallas/Fort Worth
$341American Airlines
Sat, Oct 17 - Sat, Oct 31
American Airlines Logo
3:36 pm - 10:59 pmSDF  Louisville Intl-ONT Ontario
10h 23m1 stop Charlotte Douglas
American Airlines Logo
2:22 pm - 11:27 pmONT  Ontario-SDF Louisville Intl
6h 05m1 stop Dallas/Fort Worth
$341American Airlines
Tue, Nov 17 - Thu, Nov 26
Delta Logo
6:00 am - 11:03 amSDF  Louisville Intl-ONT Ontario
8h 03m1 stop Atlanta Hartsfield-Jackson
Delta Logo
7:05 am - 7:14 pmONT  Ontario-SDF Louisville Intl
9h 09m1 stop Atlanta Hartsfield-Jackson
$341Delta
Wed, Oct 28 - Tue, Nov 3
Delta Logo
6:00 am - 11:06 amSDF  Louisville Intl-ONT Ontario
8h 06m1 stop Atlanta Hartsfield-Jackson
Delta Logo
12:16 pm - 10:47 pmONT  Ontario-SDF Louisville Intl
7h 31m1 stop Atlanta Hartsfield-Jackson
$341Delta
Wed, Nov 4 - Wed, Nov 11
American Airlines Logo
4:35 pm - 10:12 pmSDF  Louisville Intl-ONT Ontario
8h 37m1 stop Charlotte Douglas
American Airlines Logo
2:22 pm - 11:34 pmONT  Ontario-SDF Louisville Intl
6h 12m1 stop Dallas/Fort Worth
$341American Airlines
Sat, Oct 31 - Tue, Nov 3
Delta Logo
1:59 pm - 7:30 pmSDF  Louisville Intl-ONT Ontario
8h 31m1 stop Atlanta Hartsfield-Jackson
Delta Logo
12:16 pm - 10:47 pmONT  Ontario-SDF Louisville Intl
7h 31m1 stop Atlanta Hartsfield-Jackson
$341Delta
Tue, Oct 20 - Tue, Oct 27
Southwest Logo
7:10 pm - 10:05 pmSDF  Louisville Intl-ONT Ontario
5h 55m1 stop Phoenix Sky Harbor Intl
Southwest Logo
10:25 am - 8:35 pmONT  Ontario-SDF Louisville Intl
7h 10m2 stops Denver Intl Nashville Intl
$346Southwest
Sat, Oct 17 - Sat, Oct 31
United Airlines Logo
6:16 pm - 10:49 pmSDF  Louisville Intl-ONT Ontario
7h 33m1 stop Chicago O'Hare Intl
United Airlines Logo
9:25 am - 10:24 pmONT  Ontario-SDF Louisville Intl
9h 59m2 stops San Francisco Denver Intl
$346United Airlines
Wed, Nov 4 - Wed, Nov 11
United Airlines Logo
10:37 am - 6:01 pmSDF  Louisville Intl-ONT Ontario
10h 24m2 stops Chicago O'Hare Intl San Francisco
United Airlines Logo
5:00 am - 2:22 pmONT  Ontario-SDF Louisville Intl
6h 22m1 stop Denver Intl
$346United Airlines
Wed, Nov 4 - Wed, Nov 11
Southwest Logo
8:50 am - 2:40 pmSDF  Louisville Intl-ONT Ontario
8h 50m2 stops Chicago Midway Denver Intl
Southwest Logo
5:45 am - 6:55 pmONT  Ontario-SDF Louisville Intl
10h 10m2 stops Las Vegas Harry Reid Intl Phoenix Sky Harbor Intl
$375Southwest
Booking Insights

Price, demand and travel trends for Louisville to Ontario flights

Use KAYAK data on prices, travel dates, airlines and seasonal trends to compare options and book flights with more confidence.

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

Round-trip flights from Louisville to Ontario typically range from $407 to $617. The lowest price found in the past 5 days was $341, on American Airlines.

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

Based on deals KAYAK users found in the last 12 months, Friday is the cheapest day of the week to fly from Louisville to Ontario. It’s 17% cheaper than the average day, while Tuesday is the most expensive, with prices 90% higher.

What’s the cheapest month to fly from Louisville to Ontario?

•September is the cheapest month to fly from Louisville to Ontario at $396 round-trip.
•November ($656) and December ($607) are the most expensive months.
•The price difference between flying in the cheapest and most expensive months is 65% on average.
This is based on KAYAK aggregated and averaged internal data over the past 12 months.

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Key details for Louisville to Ontario flights

Low season

April

Cheapest flight

$171
Beat the crowds with an average 70% drop in travelers.
The most popular month to fly with an average 50% increase in travelers.
One-way 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

Your Louisville to Ontario flight questions, answered

Find helpful answers about this route, including flight times, airports, airlines and booking tips.

  • What cabin classes can I book on flights from Louisville to Ontario?

    Two cabin classes are available on flights from Louisville to Ontario:

    • Economy Class
    • First Class

  • How long is a flight from Louisville to Ontario?

    A nonstop flight from Louisville to Ontario takes 00m, covering 1,791 miles.

  • Do I need a passport to fly from Louisville to Ontario?

    No, a passport is not required for this domestic route, but you will need a real ID-compliant driver's license, a state ID or another TSA-accepted form of identification.

  • How much should I expect to pay for a Louisville to Ontario flight?

    Round-trip flights from Louisville to Ontario range from $407 to $617, with an average of $483 over the past 12 months. Anything below $407 counts as a good deal.

  • Have flight prices from Louisville to Ontario changed much recently?

    Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about $341 to $3,118. That means the highest observed fare was about 9x higher than the lowest one.

  • How are flight prices from Louisville to Ontario looking right now?

    One-way fares from Louisville to Ontario are currently lower than usual. Average one-way flight prices are about $203, which is 22% below the typical average for this route.

  • What car rental options are available at Ontario Airport (ONT)?

    Ontario Airport (ONT) hosts 5 major car rental companies, with daily rates starting from around $18 for economy cars. Top options include:

    • Fox
    • Thrifty
    • Europcar
    • Dollar
    • Alamo

  • Which airports can I use when flying from Louisville to Ontario?

    Flights from Louisville to Ontario usually depart from Louisville Intl (SDF) and arrive at Ontario (ONT).

  • Which airports do connecting flights from Louisville to Ontario pass through?

    One-stop flights from Louisville to Ontario most commonly connect through:

    • Dallas/Fort Worth (DFW) - 57% of one-stop connections
    • Denver Intl (DEN) - 25% of one-stop connections
    • Atlanta Hartsfield-Jackson (ATL) - 11% of one-stop connections
    • Nashville Intl (BNA) - 2% of one-stop connections

  • Can I save money by using flexible dates for flights from Louisville to Ontario?

    Yes. Flexible dates can save you up to 57% on flights from Louisville to Ontario. Friday is the cheapest departure day at $403 round-trip on average, while Tuesday is the most expensive at $919, a difference of $516.

    KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

  • How much time can I save by choosing a different layover airport from Louisville to Ontario?

    Flying via Phoenix Sky Harbor Intl (PHX) gives the shortest average 1-stop total travel time at 5h 44m, compared with 6h 28m via Denver Intl (DEN) and 6h 55m via Atlanta Hartsfield-Jackson (ATL).

  • What is the time difference between Louisville and Ontario?

    Ontario is 3 hours behind Louisville (Pacific Time vs Eastern Time). Plan for the time shift when scheduling connections or first-day activities.

  • What popular places can I visit in Ontario?

    Some of the most popular sights in Ontario are Ontario Convention Center and Cucamonga-Guasti Regional Park. These are among the most viewed places in Ontario on KAYAK.

Your guide to booking Louisville to Ontario flights

Get tips on when to book, when to fly and what to know before your trip.
  • If your dates are flexible, aim for a Friday departure and avoid flying on Tuesday. On this route, Friday flights average $403, about $516 less than Tuesday fares (56% savings) based on the last 12 months.
  • If you can choose when to travel, plan your Louisville to Ontario trip for September. Fares historically average $396 round-trip in that month - typically $260 less than the most expensive month, which is November (based on the last 12 months).
  • If you're arriving late at night and need somewhere to stay, check out these hotels close to Ontario Airport.

    • Azure Hotel & Suites, Trademark Collection by Wyndham
    • La Quinta Inn & Suites by Wyndham Ontario Airport
    • Ontario Airport Inn

More options for your flight from Louisville to Ontario

Complete your trip to Ontario with a hotel stay or car rental

Car rentals in Ontario
Hotels in Ontario
Vacations in Ontario