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Cheap Flights from Ontario (ONT) to Louisville (SDF)

Compare Ontario International to Louisville Muhammad Ali International flight deals

Find the cheapest month or even day of the year to fly to Louisville Muhammad Ali International

Book the best Louisville Muhammad Ali International fare with no extra fees

Flight deals from Ontario International to Louisville Muhammad Ali International

Looking for a cheap last-minute deal or the best return flight from Ontario International to Louisville Muhammad Ali International? Find the lowest prices on one-way and return tickets right here.
Louisville.$464 per passenger.Departing Mon, 8 Sep, returning Wed, 10 Sep.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Mon, 8 Sep, arriving in Louisville Muhammad Ali International.Inbound indirect flight with Southwest Airlines, departs from Louisville Muhammad Ali International on Wed, 10 Sep, arriving in Ontario International.Price includes taxes and charges.From $464, select.
Louisville.$464 per passenger.Departing Thu, 14 Aug, returning Tue, 19 Aug.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Thu, 14 Aug, arriving in Louisville Muhammad Ali International.Inbound indirect flight with Southwest Airlines, departs from Louisville Muhammad Ali International on Tue, 19 Aug, arriving in Ontario International.Price includes taxes and charges.From $464, select.
Louisville.$486 per passenger.Departing Fri, 24 Oct, returning Mon, 27 Oct.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Fri, 24 Oct, arriving in Louisville Muhammad Ali International.Inbound indirect flight with Southwest Airlines, departs from Louisville Muhammad Ali International on Mon, 27 Oct, arriving in Ontario International.Price includes taxes and charges.From $486, select.
Louisville.$495 per passenger.Departing Thu, 30 Oct, returning Sun, 2 Nov.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Thu, 30 Oct, arriving in Louisville Muhammad Ali International.Inbound indirect flight with Southwest Airlines, departs from Louisville Muhammad Ali International on Sun, 2 Nov, arriving in Ontario International.Price includes taxes and charges.From $495, select.
Louisville.$548 per passenger.Departing Sun, 28 Sep, returning Thu, 2 Oct.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Sun, 28 Sep, arriving in Louisville Muhammad Ali International.Inbound indirect flight with Southwest Airlines, departs from Louisville Muhammad Ali International on Thu, 2 Oct, arriving in Ontario International.Price includes taxes and charges.From $548, select.
Louisville.$557 per passenger.Departing Sun, 2 Nov, returning Thu, 6 Nov.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Sun, 2 Nov, arriving in Louisville Muhammad Ali International.Inbound indirect flight with Southwest Airlines, departs from Louisville Muhammad Ali International on Thu, 6 Nov, arriving in Ontario International.Price includes taxes and charges.From $557, select.
Louisville.$632 per passenger.Departing Thu, 19 Feb, returning Mon, 23 Feb.Return flight with United.Outbound indirect flight with United, departs from Ontario International on Thu, 19 Feb, arriving in Louisville Muhammad Ali International.Inbound indirect flight with United, departs from Louisville Muhammad Ali International on Mon, 23 Feb, arriving in Ontario International.Price includes taxes and charges.From $632, select.
Louisville.$1,034 per passenger.Departing Thu, 31 Jul, returning Mon, 11 Aug.Return flight with Southwest Airlines.Outbound indirect flight with Southwest Airlines, departs from Ontario International on Thu, 31 Jul, arriving in Louisville Muhammad Ali International.Inbound indirect flight with Southwest Airlines, departs from Louisville Muhammad Ali International on Mon, 11 Aug, arriving in Ontario International.Price includes taxes and charges.From $1,034, select.

Find the cheapest month to fly from Ontario International to Louisville Muhammad Ali International

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Ontario International to Louisville Muhammad Ali International flights are currently cheapest in August.
Jul
from $1,091
Aug
from $464
Sep
from $464
Oct
from $486
Nov
from $557
Dec
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Jan
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Feb
from $632
Mar
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Apr
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May
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Jun
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Ontario International to Louisville Muhammad Ali International: Alternative routes

Compare routes from Ontario International to Louisville below. You may find an airport to fly into that's cheaper, faster, or easier than Louisville Muhammad Ali International.

Ontario to Louisville: Flight information

The things to know before you go.
Cheapest flight found$464
Cheapest month to flySeptember

Finding cheap flights from Ontario International to Louisville Muhammad Ali International: Frequently asked questions

The best price we found for a return flight from Ontario International to Louisville Muhammad Ali International is $464. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
Currently, there are no airlines that fly direct from Ontario International to Louisville Muhammad Ali International. But we found flights with one or more stops from $464.
As of July 2025, there are no flights flying from Ontario International to Louisville Muhammad Ali International.
The cheapest month to fly from Ontario International to Louisville Muhammad Ali International is usually September.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Ontario International Airport to Louisville Muhammad Ali International Airport on Monday, 8 September 2025.
No airlines currently offer direct flights between Ontario International Airport and Louisville Muhammad Ali International Airport. Most routes have one or more stops.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Louisville Muhammad Ali International but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Louisville is around 40 days in advance, so don’t leave your flight to the last minute.
Currently, Southwest Airlines offers the cheapest flight tickets to Louisville Muhammad Ali International.

Flying from Ontario International Airport (ONT) to Louisville International Airport-Standiford Field (SDF): what you need to know

  • Arriving two hours before an international flight and one hour ahead of a domestic departure are tried-and-true travel tips. Get to the airport on time to board your ONT to SDF flight.

  • During popular months such as August, it's best to get to the airport well in advance. Plan to arrive two hours before a domestic departure and four hours ahead for an international flight whenever you're flying during a high season in general.

  • If you want to break up your flight, simply deselect 'Direct flights only' when searching for your ticket from Ontario International Airport to Louisville International Airport-Standiford Field. Here are the top stopovers between ONT and SDF:

    • Harry Reid Airport (formerly McCarran Airport)

    • Denver International Airport

    • Dallas/Fort Worth International Airport

How to find the cheapest flights from Ontario International Airport (ONT) to Louisville International Airport-Standiford Field (SDF)

  • $133 is currently the best price for a one-way Ontario International Airport to Louisville International Airport-Standiford Field flight. Return flights start from $464. These fares can change depending on demand.

  • To pick up cheap tickets from ONT to SDF, book as early as you can. Airlines tend to offer their most competitively priced fares when flights are first released.

  • Getting cheap flights from Ontario International Airport to Louisville International Airport-Standiford Field is easy if you can be flexible with your travel dates. Use the 'Whole month' search tool to see the best prices across each month and score a great deal.

  • There's no need to check every day to find out if fares have dropped when you set up a Price Alert. We'll update you as soon as there's a better deal on cheap flights from ONT to SDF.

  • Tailor your trip with filters. Pick your ideal arrival and departure times, total journey duration and airlines. You can also sort your results by 'Cheapest,' 'Best' or 'Fastest' flights from Ontario International Airport to Louisville International Airport-Standiford Field.

Handy information about Ontario International Airport (ONT)

  • ONT is located at 2900 E. Airport Drive.

  • Ontario International Airport has a strong on-time performance, making delays less likely. Departures from ONT land on schedule 83.6% of the time.

  • Central Ontario to Ontario International Airport is around 6 kilometres. Depending on traffic, it'll take about 10 minutes to get there if you're driving, catching a cab or ride-sharing.

  • The journey when using public transport takes roughly 1 hour 30 minutes.

  • Need a handy hotel near ONT? If you're boarding an early flight from Ontario International Airport to Louisville International Airport-Standiford Field, these stays will put you moments from your check-in counter:

Arriving at Louisville International Airport-Standiford Field (SDF)

Getting from Louisville International Airport-Standiford Field (SDF) to central Louisville

  • SDF is located at 600 Terminal Drive.

  • From Louisville International Airport-Standiford Field, Louisville is approximately 23 kilometres away. It takes around 25 minutes to reach the centre driving.

  • If you're travelling on public transport, expect a journey time of roughly 2 hours 40 minutes.

When to fly to Louisville International Airport-Standiford Field (SDF)

  • The quietest month for a flight from Ontario International Airport to Louisville International Airport-Standiford Field is March, while July is the most popular. Choose the ideal time to go to Louisville based on whether you prefer a laid-back vibe or a more bustling atmosphere.

  • Before locking in your flight from Ontario International Airport to Louisville International Airport-Standiford Field, consider the type of weather you like. July is the warmest month in Louisville, with temperatures ranging from 17ºC (63ºF) to 33ºC (91ºF).

  • January has average temperatures of between -8ºC (18ºF) and 9ºC (48ºF). Search for cheap tickets from ONT to SDF sometime then if you like travelling in cooler conditions.

Explore more of United States

  • Louisville has plenty going for it, but there are so many other parts of United States just waiting to be discovered. About 434 kilometres north-west of Louisville, a visit to Chicago will keep you busy. Start with leading sights like Millennium Park, Art Institute of Chicago and LandShark Beer Garden at Navy Pier.

  • Around 290 kilometres north-east of Louisville, Columbus is another essential stop in United States. Experience the best of this destination with a visit to Franklin Park Conservatory and Botanical Gardens, Ohio Statehouse and German Village.

Plan the rest of your trip from Ontario to Louisville

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.