Cheap Flights from St. Louis to Denver
Browse current best options from St. Louis. Become a member to unlock all deals and get alerts when new deals appear.
Deals from
St. Louis
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Prices updated 5 days ago
402 airlines compared
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Fares are subject to change and may not be available for all dates. (Data last updated Jul 12, 2026.)
Today’s best flight deals from St. Louis to Denver
Explore current cheapest deals departing from St. Louis to Denver
Round trip
Sort by: Cheapest
August 4 - August 6
STL - Denver
$152
$96
Round trip
August 4 - August 10
STL - Denver
$140
$96
Round trip
August 10 - August 13
STL - Denver
$147
$97
Round trip
August 11 - August 13
STL - Denver
$149
$97
Round trip
September 10 - September 14
STL - Denver
$135
$97
Round trip
August 13 - August 17
STL - Denver
$147
$98
Round trip
August 6 - August 10
STL - Denver
$148
$98
Round trip
October 10 - October 12
STL - Denver
$137
$98
Round trip
October 13 - October 17
STL - Denver
$138
$98
Round trip
September 21 - October 21
STL - Denver
$112
$98
Round trip
Unlock all 500+ flight deals to Denver and get alerts when great deals appear
St. Louis to Denver: Overview
Insights for flights from St. Louis to Denver
How much is a round trip from St. Louis to Denver
Regular price: $114 - $278
Prices for flights from St. Louis to Denver are currently below the regular range.
The regular price range for flights from St. Louis to Denver is between $114 and $278. The current lowest deal is $96 with Frontier Airlines for travel from Aug 4-Aug 6.
now $96
Low $114
High $278
The cheapest time to fly from St. Louis to Denver
The cheapest month to fly from St. Louis to Denver is May, with a median price of $109. The most expensive month is June, with a median price of $540. Prices are generally lower from January to October.
May
Flights from $109
June
Flights from $540
Direct flights from St. Louis to Denver
Frontier Airlines
Last-minute flights going from St. Louis to Denver
Mon, Jul 27
STL - Denver
St. Louis (STL) - Denver (DEN)
Frontier Airlines
$295
$252
One-way
Tue, Jul 28
STL - Denver
St. Louis (STL) - Denver (DEN)
Frontier Airlines
$285
$243
One-way
Sat, Aug 1
STL - Denver
St. Louis (STL) - Denver (DEN)
Frontier Airlines
$271
$225
One-way
Mon, Aug 3
STL - Denver
St. Louis (STL) - Denver (DEN)
Frontier Airlines
$268
$160
One-way
Mon, Aug 3
STL - Denver
St. Louis (STL) - Denver (DEN)
Frontier Airlines
$268
$201
One-way
Mon, Aug 3
STL - Denver
St. Louis (STL) - Denver (DEN)
Frontier Airlines
$271
$222
One-way
Biggest price drops on these dates for flights from St. Louis to Denver
Jul 24 - Jul 28
$278 → $170
39%
Jul 18 - Jul 21
$311 → $207
34%
Jul 22 - Jul 24
$282 → $191
32%
Aug 7 - Aug 8
$258 → $176
32%
Popular Airports to fly from St. Louis to Denver
St. Louis - Denver route insights
💸 Price insights
Recent fares are below the typical level
Recent fares for St. Louis to Denver are below the typical level at a median of $391.
📅 Best time to fly
Fly in May for the best prices
Historically, May is the cheapest month to fly from St. Louis to Denver, at $109.
⏱️ Flight duration
Direct flights take 2h 33m
Direct flights from St. Louis to Denver typically take 2h 33m.
✈️ Airlines & availability
Frontier Airlines offers direct flights
Frontier Airlines offers direct flights on the St. Louis to Denver route.
🏆 Airline highlight
Frontier Airlines has a deal for $96
Frontier Airlines offers a deal for $96 from St. Louis to Denver.
🎯 Booking tip
Deals are frequent on this route
Deals on flights from St. Louis to Denver are frequent, appearing often.
St. Louis main airports to depart from
St. Louis Lambert International (STL)
St. Louis Lambert International Airport is a convenient departure point for flights to Denver.
📍 ~20 km from St. Louis (reachable by car or train)
💸 Flights from ~$96
Denver main airports to arrive at
Denver International (DEN)
Denver International Airport is a primary gateway to Denver, offering convenient access to the city.
📍 ~30 km from city center (reachable by car)
💸 Flights from ~$96
Airports nearby Denver used as alternative
Colorado Springs (COS)
Colorado Springs is a reliable alternative for Denver, offering robust flight schedules and multiple major carriers.
📍 ~100 km from destination city (reachable by car)
💸 Flights from ~$239
Eagle County Regional (EGE)
Eagle County Regional is an excellent alternative for travelers located in Denver's western suburbs or mountains.
📍 ~160 km from destination city (reachable by car)
💸 Flights from ~$321
Aspen–Pitkin County (ASE)
Aspen–Pitkin County is convenient for travelers originating in the high-country region with frequent regional connections.
📍 ~165 km from destination city (reachable by car)
💸 Flights from ~$347
Cheyenne Regional (CYS)
Cheyenne Regional is accessible for travelers in northern Denver suburbs and Fort Collins, offering small airport convenience.
📍 ~145 km from destination city (reachable by car)
💸 Flights from ~$292
Yampa Valley (HDN)
Yampa Valley is a viable alternative for Northwest Colorado residents, with business class service on regional routes.
📍 ~205 km from destination city (reachable by car)
💸 Flights from ~$311
Business & First Class Flight Deals to Denver
Discover luxury on the budget with premium cabin class on flights from St. Louis to Denver.
Elite
Best Elite deals to Denver
Exclusive daily First Class, Business Class, and Premium Economy flight deals, refreshed every 24 hours.
From STL
Elite
Aug 05
Denver, United States
78% AI deal score
$942
$613
Save $329
From STL
Elite
Aug 07
Denver, United States
77% AI deal score
$942
$640
Save $302
From STL
Elite
Aug 03
Denver, United States
77% AI deal score
$942
$640
Save $302
From STL
Elite
Aug 03
Denver, United States
77% AI deal score
$961
$640
Save $321
From STL
Elite
Aug 01
Denver, United States
77% AI deal score
$942
$640
Save $302
From STL
Elite
Sep 01
Denver, United States
76% AI deal score
$2,305
$1,305
Save $1,000
From STL
Elite
Aug 21
Denver, United States
76% AI deal score
$920
$640
Save $280
From STL
Elite
Aug 14
Denver, United States
76% AI deal score
$936
$640
Save $296
From STL
Elite
Aug 11
Denver, United States
76% AI deal score
$922
$657
Save $265
From STL
Elite
Aug 07
Denver, United States
76% AI deal score
$961
$663
Save $298
From STL
Elite
Aug 01
Denver, United States
76% AI deal score
$961
$663
Save $298
From STL
Elite
Aug 21
Denver, United States
76% AI deal score
$939
$667
Save $272
From STL
Elite
Aug 14
Denver, United States
76% AI deal score
$955
$667
Save $288
From STL
Elite
Aug 06
Denver, United States
76% AI deal score
$942
$667
Save $275
From STL
Elite
Sep 01
Denver, United States
75% AI deal score
$2,256
$1,339
Save $917
From STL
Elite
Sep 01
Denver, United States
75% AI deal score
$2,494
$1,425
Save $1,069
From STL
Elite
Aug 09
Denver, United States
75% AI deal score
$835
$640
Save $195
From STL
Elite
Aug 04
Denver, United States
75% AI deal score
$901
$657
Save $244
From STL
Elite
Aug 03
Denver, United States
74% AI deal score
$831
$663
Save $168
From STL
Elite
Sep 01
Denver, United States
70% AI deal score
$2,302
$1,445
Save $857
From STL
Elite
Aug 01
Denver, United States
69% AI deal score
$813
$667
Save $146
From STL
Elite
Aug 21
Denver, United States
69% AI deal score
$801
$667
Save $134
From STL
Elite
Aug 15
Denver, United States
69% AI deal score
$804
$670
Save $134
From STL
Elite
Aug 04
Denver, United States
69% AI deal score
$813
$682
Save $131
From STL
Elite
Jul 23
Denver, United States
68% AI deal score
$810
$697
Save $113
From STL
Elite
Jul 29
Denver, United States
67% AI deal score
$1,918
$1,559
Save $359
From STL
Elite
Jul 29
Denver, United States
67% AI deal score
$1,918
$1,559
Save $359
From STL
Elite
Jul 29
Denver, United States
67% AI deal score
$1,918
$1,559
Save $359
From STL
Elite
Jul 29
Denver, United States
67% AI deal score
$1,932
$1,565
Save $367
From STL
Elite
Jul 24
Denver, United States
67% AI deal score
$1,924
$1,566
Save $358
From STL
Elite
Jul 23
Denver, United States
67% AI deal score
$1,942
$1,587
Save $355
From STL
Elite
Jul 29
Denver, United States
67% AI deal score
$1,925
$1,599
Save $326
From STL
Elite
Jul 29
Denver, United States
67% AI deal score
$1,918
$1,599
Save $319
From STL
Elite
Jul 24
Denver, United States
67% AI deal score
$1,924
$1,606
Save $318
From STL
Elite
Jul 24
Denver, United States
67% AI deal score
$1,924
$1,606
Save $318
From STL
Elite
Jul 29
Denver, United States
67% AI deal score
$1,993
$1,639
Save $354
From STL
Elite
Aug 02
Denver, United States
67% AI deal score
$2,052
$1,650
Save $402
From STL
Elite
Aug 02
Denver, United States
67% AI deal score
$2,020
$1,650
Save $370
From STL
Elite
Aug 02
Denver, United States
67% AI deal score
$2,020
$1,650
Save $370
From STL
Elite
Jul 29
Denver, United States
67% AI deal score
$2,058
$1,684
Save $374
From STL
Elite
Aug 02
Denver, United States
67% AI deal score
$2,082
$1,690
Save $392
From STL
Elite
Aug 02
Denver, United States
67% AI deal score
$2,020
$1,690
Save $330
From STL
Elite
Aug 02
Denver, United States
67% AI deal score
$2,022
$1,690
Save $332
From STL
Elite
Aug 02
Denver, United States
67% AI deal score
$2,030
$1,690
Save $340
From STL
Elite
Aug 02
Denver, United States
67% AI deal score
$2,020
$1,690
Save $330
From STL
Elite
Aug 02
Denver, United States
67% AI deal score
$2,208
$1,730
Save $478
From STL
Elite
Sep 22
Denver, United States
67% AI deal score
$707
$613
Save $94
From STL
Elite
Jul 27
Denver, United States
67% AI deal score
$759
$663
Save $96
From STL
Elite
Jul 26
Denver, United States
67% AI deal score
$759
$667
Save $92
From STL
Elite
Jul 25
Denver, United States
67% AI deal score
$747
$667
Save $80
From STL
Elite
Jul 31
Denver, United States
67% AI deal score
$751
$667
Save $84
From STL
Elite
Jul 28
Denver, United States
67% AI deal score
$747
$667
Save $80
From STL
Elite
Aug 01
Denver, United States
67% AI deal score
$789
$688
Save $101
From STL
Elite
Jul 23
Denver, United States
66% AI deal score
$1,942
$1,655
Save $287
From STL
Elite
Jul 23
Denver, United States
66% AI deal score
$1,953
$1,655
Save $298
From STL
Elite
Jul 29
Denver, United States
66% AI deal score
$1,978
$1,684
Save $294
From STL
Elite
Jul 29
Denver, United States
66% AI deal score
$1,972
$1,684
Save $288
From STL
Elite
Jul 14
Denver, United States
66% AI deal score
$1,956
$1,742
Save $214
From STL
Elite
Sep 20
Denver, United States
66% AI deal score
$722
$657
Save $65
From STL
Elite
Jul 30
Denver, United States
66% AI deal score
$702
$657
Save $45
From STL
Elite
Jul 30
Denver, United States
66% AI deal score
$723
$667
Save $56
From STL
Elite
Jul 28
Denver, United States
66% AI deal score
$728
$667
Save $61
From STL
Elite
Jul 30
Denver, United States
66% AI deal score
$734
$667
Save $67
From STL
Elite
Sep 18
Denver, United States
66% AI deal score
$722
$667
Save $55
From STL
Elite
Oct 15
Denver, United States
66% AI deal score
$752
$688
Save $64
From STL
Elite
Sep 12
Denver, United States
65% AI deal score
$704
$657
Save $47
From STL
Elite
Sep 11
Denver, United States
65% AI deal score
$707
$663
Save $44
From STL
Elite
Sep 17
Denver, United States
65% AI deal score
$710
$667
Save $43
From STL
Elite
Oct 09
Denver, United States
48% AI deal score
$674
$665
Save $9
From STL
Elite
Jul 31
Denver, United States
47% AI deal score
$667
From STL
Elite
Sep 05
Denver, United States
47% AI deal score
$667
From STL
Elite
Sep 14
Denver, United States
47% AI deal score
$667
From STL
Elite
Aug 22
Denver, United States
44% AI deal score
$2,868
From STL
Elite
Aug 26
Denver, United States
44% AI deal score
$2,896
From STL
Elite
Aug 14
Denver, United States
44% AI deal score
$2,899
From STL
Elite
Aug 14
Denver, United States
44% AI deal score
$2,899
From STL
Elite
Aug 18
Denver, United States
44% AI deal score
$2,908
From STL
Elite
Aug 14
Denver, United States
43% AI deal score
$2,908
From STL
Elite
Aug 14
Denver, United States
43% AI deal score
$2,968
From STL
Elite
Aug 18
Denver, United States
43% AI deal score
$2,977
From STL
Elite
Aug 18
Denver, United States
43% AI deal score
$2,977
From STL
Elite
Aug 18
Denver, United States
43% AI deal score
$2,977
From STL
Elite
Sep 26
Denver, United States
43% AI deal score
$3,011
From STL
Elite
Aug 12
Denver, United States
42% AI deal score
$2,467
From STL
Elite
Aug 12
Denver, United States
41% AI deal score
$2,427
From STL
Elite
Aug 12
Denver, United States
41% AI deal score
$2,427
From STL
Elite
Aug 12
Denver, United States
41% AI deal score
$2,427
From STL
Elite
Aug 12
Denver, United States
41% AI deal score
$2,467
From STL
Elite
Aug 12
Denver, United States
41% AI deal score
$2,467
From STL
Elite
Aug 12
Denver, United States
40% AI deal score
$2,467
From STL
Elite
Aug 12
Denver, United States
40% AI deal score
$2,467