$99 Cheap Delta flights St. Louis (STL) to Denver (DEN)

View $99 flight on Wed, Sep 10, 2025Opens in a new window

$99 Cheap Delta flights St. Louis (STL) to Denver (DEN)

Prices were available within the past 7 days and start at $99 for one-way flights and $160 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Sat, Sep 27 - Sat, Oct 4
STL
St. Louis
DEN
Denver
$160 Roundtrip, found 16 hours ago
$160
Roundtrip
found 16 hours ago
Select Delta flight, departing Sat, Sep 27 from St. Louis to Denver, returning Sat, Oct 4, priced at $160 found 16 hours ago
Delta
Mon, Oct 27 - Tue, Nov 4
STL
St. Louis
DEN
Denver
$170 Roundtrip, found 16 hours ago
$170
Roundtrip
found 16 hours ago
Select Delta flight, departing Mon, Oct 27 from St. Louis to Denver, returning Tue, Nov 4, priced at $170 found 16 hours ago
Delta
Fri, Sep 19 - Mon, Sep 22
STL
St. Louis
DEN
Denver
$176 Roundtrip, found 1 hour ago
$176
Roundtrip
found 1 hour ago
Select Delta flight, departing Fri, Sep 19 from St. Louis to Denver, returning Mon, Sep 22, priced at $176 found 1 hour ago
Delta
Tue, Oct 28 - Sat, Nov 1
STL
St. Louis
DEN
Denver
$177 Roundtrip, just found
$177
Roundtrip
just found
Select Delta flight, departing Tue, Oct 28 from St. Louis to Denver, returning Sat, Nov 1, priced at $177 just found
Delta
Sat, Oct 25 - Wed, Oct 29
STL
St. Louis
DEN
Denver
$178 Roundtrip, just found
$178
Roundtrip
just found
Select Delta flight, departing Sat, Oct 25 from St. Louis to Denver, returning Wed, Oct 29, priced at $178 just found
Delta
Tue, Sep 23 - Sat, Sep 27
STL
St. Louis
DEN
Denver
$180 Roundtrip, just found
$180
Roundtrip
just found
Select Delta flight, departing Tue, Sep 23 from St. Louis to Denver, returning Sat, Sep 27, priced at $180 just found
Delta
Wed, Aug 20 - Sat, Aug 23
STL
St. Louis
DEN
Denver
$184 Roundtrip, found 1 hour ago
$184
Roundtrip
found 1 hour ago
Select Delta flight, departing Wed, Aug 20 from St. Louis to Denver, returning Sat, Aug 23, priced at $184 found 1 hour ago
Flights from St. Louis (STL) to Denver (DEN)
Origin airport
Lambert-St. Louis Intl.
Destination airport
Denver Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Southwest Airlines, United
Popular airline
Frontier Airlines
Distance
767 mi
Average flight time
1 hour 19 mins

Frequently asked questions

How much is a Delta Air Lines flight from Lambert-St. Louis Intl. Airport (STL) to Denver Intl. Airport (DEN)?
You'll discover cheap round-trip Delta Air Lines flights from $160 from STL to DEN by filtering your results from "Price (lowest to highest)" on Expedia. Or search for bargains from $99 for a one-way journey.**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 STL to DEN with Delta Air Lines?
Search for round-trip or one-way flights to Denver in January or November. You could find cheaper fares with Delta Air Lines during these off-peak months.
What is the cheapest time to book flights from Lambert-St. Louis Intl. Airport (STL) to Denver Intl. Airport (DEN) with Delta Air Lines?
Search for affordable Delta Air Lines flights from Lambert-St. Louis Intl. Airport (STL) to Denver Intl. Airport (DEN) one to three months prior to your departure. Travelers who book domestic flights 34 to 86 days in advance can save 25% compared to those who book just 6 to 12 days ahead. No matter the fare type and itinerary, the best day of the week to book a domestic flight is usually Sunday and the most expensive day tends to be Monday. Passengers who book on a Sunday can save 6% on average compared to those who book their travel on a Monday.**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 Delta Air Lines fly nonstop from Lambert-St. Louis Intl. Airport (STL) to Denver Intl. Airport (DEN)?
To see if there's a direct trip from STL to DEN with Delta Air Lines or any other carriers, check the "Nonstop" filter when searching for flights.
What is the earliest Delta Air Lines flight from STL to DEN?
To find the earliest departure from STL to DEN with Delta Air Lines, filter your search by "Morning" and "Early Morning." Choosing an early flight usually means cancellations are less likely.**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 Delta Air Lines fly into in Denver?
Catch a Delta Air Lines flight from Lambert-St. Louis Intl. Airport (STL) to Denver, and you're most likely to come in to Denver Intl. Airport (DEN). This is the airline's primary hub here.
Why fly with Delta Air Lines from STL to DEN?
With an excellent in-flight experience and a rewarding loyalty program, Delta Air Lines is a favorite for many travelers flying from STL to DEN. Plus, if you're a Delta SkyMiles and One Key™ member booking through Expedia, you could earn OneKeyCash™* on eligible flights on top of your airline miles, which can be put toward future travel purchases.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.
Can I change or cancel my Delta Air Lines flight from Lambert-St. Louis Intl. Airport (STL) to Denver Intl. Airport (DEN)?
Depending on the ticket type you purchased, a fee may apply if you cancel or reschedule your booking more than 24 hours after it's been confirmed. To secure tickets with more flexibility, select our "Changes included" and "No cancel fee" boxes when you look for flights. To learn more about changing or canceling your reservation, visit "Trips," select your flight and tick "Manage Booking."

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*Available to One Key members.