$129 Cheap United flights Louisville (SDF) to Denver (DEN)

View $129 flight on Tue, Sep 30, 2025Opens in a new window

  • Plan, book, fly with confidence

  • trending down icon
    Be in the know
    Get alerts if flight prices drop or rise*
  • bex rewards loyalty icon
    Book smarter
    Save up to 30% on select hotels after you book a flight*
  • one key icon
    Earn twice
    Earn your airline miles on top of our OneKeyCash
    Learn about One Key

$129 Cheap United flights Louisville (SDF) to Denver (DEN)

Prices were available within the past 7 days and start at $129 for one-way flights and $257 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Tue, Sep 30 - Tue, Oct 7
SDF
Louisville
DEN
Denver
$257 Roundtrip, found 6 hours ago
$257
Roundtrip
found 6 hours ago
Select United flight, departing Tue, Sep 30 from Louisville to Denver, returning Tue, Oct 7, priced at $257 found 6 hours ago
United
Mon, Aug 4 - Thu, Aug 7
SDF
Louisville
DEN
Denver
$259 Roundtrip, found 18 hours ago
$259
Roundtrip
found 18 hours ago
Select United flight, departing Mon, Aug 4 from Louisville to Denver, returning Thu, Aug 7, priced at $259 found 18 hours ago
United
Sat, Aug 30 - Thu, Sep 4
SDF
Louisville
DEN
Denver
$268 Roundtrip, found 17 hours ago
$268
Roundtrip
found 17 hours ago
Select United flight, departing Sat, Aug 30 from Louisville to Denver, returning Thu, Sep 4, priced at $268 found 17 hours ago
United
Tue, Aug 5 - Wed, Aug 6
SDF
Louisville
DEN
Denver
$270 Roundtrip, found 2 days ago
$270
Roundtrip
found 2 days ago
Select United flight, departing Tue, Aug 5 from Louisville to Denver, returning Wed, Aug 6, priced at $270 found 2 days ago
United
Sat, Aug 9 - Sat, Aug 16
SDF
Louisville
DEN
Denver
$277 Roundtrip, found 20 hours ago
$277
Roundtrip
found 20 hours ago
Select United flight, departing Sat, Aug 9 from Louisville to Denver, returning Sat, Aug 16, priced at $277 found 20 hours ago
United
Tue, Aug 5 - Wed, Aug 6
SDF
Louisville
DEN
Denver
$284 Roundtrip, found 2 days ago
$284
Roundtrip
found 2 days ago
Select United flight, departing Tue, Aug 5 from Louisville to Denver, returning Wed, Aug 6, priced at $284 found 2 days ago
0
Flights from Louisville (SDF) to Denver (DEN)
Origin airport
Louisville Intl.
Destination airport
Denver Intl.
Airlines serving
American Airlines, Delta, Southwest Airlines, Sun Country Airlines, United
Popular airline
American Airlines
Distance
1020 mi

Frequently asked questions

How much is a United Airlines flight from Louisville Intl. Airport (SDF) to Denver Intl. Airport (DEN)?
Apply the "Price (lowest to highest)" filter on Expedia to search for cheap United Airlines return flights from $257 from SDF to DEN. Affordable one-way fares from $129 are also on offer.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.
What is the cheapest month to fly from SDF to DEN with United Airlines?
Search for one-way or round-trip flights to Denver in January or November. You could find cheaper fares with United Airlines during these off-peak months.
What is the cheapest time to book flights from Louisville Intl. Airport (SDF) to Denver Intl. Airport (DEN) with United Airlines?
For cheap United Airlines fares from Louisville Intl. Airport (SDF) to Denver Intl. Airport (DEN), start searching one to three months before your planned departure. Securing domestic flights 34 to 86 days in advance could save you 25% compared to booking just 6 to 12 days ahead. The day you book can also impact the cost. Sunday tends to be the most affordable, while Monday is often the most expensive for domestic flights. You can save 6% on average by booking your flight on a Sunday.**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC's global airline sales database.
Does United Airlines fly nonstop from Louisville Intl. Airport (SDF) to Denver Intl. Airport (DEN)?
Easily travel from Louisville Intl. Airport (SDF) to Denver Intl. Airport (DEN) on any of United Airlines's 11 direct weekly flights. Use our "Nonstop" and "Airline" filters to find the United Airlines flight that'll take you to DEN at a time that suits you.
How long does it take to fly from SDF to DEN with United Airlines?
Depart Louisville Intl. Airport (SDF) for Denver Intl. Airport (DEN) on a direct United Airlines flight, and you'll be in the sky for about 3h 13m.
Which day of the week has the most United Airlines flights from Louisville Intl. Airport (SDF) to Denver Intl. Airport (DEN)?
If flexibility is what you're after, Thursday offers the most choice for United Airlines flights from Louisville Intl. Airport (SDF) to Denver Intl. Airport (DEN). You can select from 2 different departures.
What is the earliest United Airlines flight from SDF to DEN?
Setting off from SDF at 9:00AM UTC-5, the earliest United Airlines flight to DEN lands at 10:14AM UTC-7. Traveling early means you're less likely to experience cancellations.* Not an early riser? The last United Airlines flight from SDF to DEN departs at 3:25PM UTC-5 and touches down at 4:35PM UTC-7.*Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports does United Airlines fly into in Denver?
Denver Intl. Airport (DEN) is the main Denver gateway for United Airlines flights from Louisville Intl. Airport (SDF).
Why fly with United Airlines from SDF to DEN?
With a rewarding loyalty program, United Airlines is a favorite of many passengers departing from SDF to DEN. Plus, as a United Mileage Plus and One Key™ member booking through Expedia, you can earn OneKeyCash™* on eligible flights along with your airline miles.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.
What type of plane does United Airlines fly from Louisville Intl. Airport (SDF) to Denver Intl. Airport (DEN)?
United Airlines usually operates Airbus A319 planes for journeys from Louisville Intl. Airport (SDF) to Denver Intl. Airport (DEN). Keep in mind that aircraft type can vary depending on operational demands, so the plane you board might be different on your travel date.
Can I change or cancel my United Airlines flight from Louisville Intl. Airport (SDF) to Denver Intl. Airport (DEN)?
Changes are usually free within 24 hours of making a booking, but your airline may charge a fee after that time. For more information about modifying your flights, head to your "Trips," select your flight and click on "Manage Booking." If you'd like the freedom to change your plans without extra charges, check the "Changes included" or "No cancel fee" filter when organizing your next adventure.

Explore a world of travel with Expedia

*Available to One Key members.