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
RatePunk searches hundreds of travel sites at once for deals on flights to Denver
Prices updated 24 days ago
486,190 searches this week
171 airlines compared
80%+ AI score for best value
Fares are subject to change and may not be available for all dates. (Data last updated May 29, 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 18 - August 25
STL - Denver
$139
$108
Round trip
August 17 - August 18
STL - Denver
$146
$108
Round trip
August 18 - August 31
STL - Denver
$124
$108
Round trip
August 17 - August 31
STL - Denver
$123
$108
Round trip
July 28 - August 18
STL - Denver
$137
$111
Round trip
July 28 - August 17
STL - Denver
$137
$111
Round trip
July 7 - July 14
STL - Denver
$160
$112
Round trip
July 15 - July 29
STL - Denver
$140
$112
Round trip
August 19 - August 25
STL - Denver
$139
$112
Round trip
August 17 - August 25
STL - Denver
$134
$112
Round trip
Unlock all 500+ flight deals to Denver and get alerts when great deals appear
Route Intelligence — 486,190 Searches this Week
Insights for flights from St. Louis to Denver
How much is a round trip from St. Louis to Denver
Regular price: $107 - $269
Prices for flights from St. Louis to Denver are currently within the regular range.
The regular price range for flights from St. Louis to Denver is typically between $107 and $269. The current lowest deal is $108 with Frontier Airlines for travel from Aug 18-Aug 25.
now $108
Low $107
High $269
The cheapest time to fly from St. Louis to Denver
The cheapest month to fly from St. Louis to Denver is April, with a median price of $95. The most expensive month is November, with a median price of $1531. Prices are generally lower from January to August.
April
Flights from $95
November
Flights from $1,531
Direct flights from St. Louis to Denver
Frontier Airlines
Last-minute flights going from St. Louis to Denver
Wed, Jun 17
STL - Denver
St. Louis (STL) - Denver (DEN)
Frontier Airlines
$542
$399
One-way
Thu, Jun 18
STL - Denver
St. Louis (STL) - Denver (DEN)
Frontier Airlines
$549
$391
One-way
Fri, Jun 19
STL - Denver
St. Louis (STL) - Denver (DEN)
Frontier Airlines
$549
$376
One-way
Sat, Jun 20
STL - Denver
St. Louis (STL) - Denver (DEN)
Frontier Airlines
$551
$405
One-way
Sun, Jun 21
STL - Denver
St. Louis (STL) - Denver (DEN)
Frontier Airlines
$508
$373
One-way
Wed, Jun 24
STL - Denver
St. Louis (STL) - Denver (DEN)
Frontier Airlines
$448
$292
One-way
Biggest price drops on these dates for flights from St. Louis to Denver
Jun 19 - Jun 21
$549 → $376
31%
Jun 18 - Jun 20
$549 → $391
29%
Jun 26 - Jun 30
$442 → $286
35%
Jun 24 - Jun 27
$448 → $292
35%
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 from St. Louis to Denver are below the typical level, with deals around $108.
📅 Best time to fly
April offers the lowest median prices at $95.
Historically, April, May, and August offer the lowest median prices for flights from St. Louis to Denver.
⏱️ Flight duration
Average flight time is 4h 47m.
The typical flight duration for this short-haul route is 4 hours and 47 minutes.
✈️ Airlines & availability
Frontier Airlines offers direct flights.
Frontier Airlines provides direct flights on this route, with frequent deals available.
🏆 Airline highlight
Frontier Airlines has a direct deal for $108.
Frontier Airlines offers a direct flight deal for $108, departing August 18 and returning August 25.
🎯 Booking tip
Good prices are available 4% of the time.
Historically, good prices for this route are available 4% of the time. Deals appear frequently.
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 city center (reachable by car)
💸 Flights from ~$108
Denver main airports to arrive at
Denver International (DEN)
Denver International Airport is a primary gateway to Denver, Colorado, offering convenient access to the city.
📍 ~30 km from city center (reachable by car, bus, rail)
💸 Flights from ~$108
Airports nearby Denver used as alternative
Colorado Springs (COS)
Colorado Springs Airport can be a useful alternative due to its proximity and robust flight schedule.
📍 ~100 km from Denver (reachable by car, ~1.5 hours depending on traffic).
💸 Flights from ~$225
Eagle County Regional (EGE)
Eagle County Regional Airport is a primary alternative for travelers heading to the western mountains.
📍 ~160 km from Denver (reachable by car).
💸 Flights from ~$311
Aspen–Pitkin County (ASE)
Aspen–Pitkin County Airport is a popular alternative with frequent service to major US hubs.
📍 ~165 km from Denver (reachable by car).
💸 Flights from ~$391
Cheyenne Regional (CYS)
Cheyenne Regional Airport is an option for those near the northern Denver metro area.
📍 ~160 km from Denver (reachable by car).
💸 Flights from ~$399
Yampa Valley (HDN)
Yampa Valley Airport serves as a viable gateway for the Northwest Colorado region.
📍 ~200 km from Denver (reachable by car).
💸 Flights from ~$351
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 18
Denver, United States
79% AI deal score
$861
$487
Save $374
From STL
Elite
Jul 28
Denver, United States
78% AI deal score
$735
$505
Save $230
From STL
Elite
Aug 25
Denver, United States
78% AI deal score
$747
$505
Save $242
From STL
Elite
Aug 26
Denver, United States
78% AI deal score
$747
$505
Save $242
From STL
Elite
Aug 18
Denver, United States
78% AI deal score
$741
$505
Save $236
From STL
Elite
Aug 11
Denver, United States
78% AI deal score
$869
$559
Save $310
From STL
Elite
Jul 08
Denver, United States
77% AI deal score
$683
$505
Save $178
From STL
Elite
Aug 11
Denver, United States
77% AI deal score
$721
$505
Save $216
From STL
Elite
Aug 26
Denver, United States
77% AI deal score
$723
$505
Save $218
From STL
Elite
Aug 18
Denver, United States
77% AI deal score
$717
$505
Save $212
From STL
Elite
Aug 26
Denver, United States
77% AI deal score
$856
$559
Save $297
From STL
Elite
Aug 12
Denver, United States
77% AI deal score
$838
$559
Save $279
From STL
Elite
Aug 04
Denver, United States
77% AI deal score
$891
$541
Save $350
From STL
Elite
Aug 20
Denver, United States
77% AI deal score
$889
$541
Save $348
From STL
Elite
Jul 21
Denver, United States
76% AI deal score
$654
$505
Save $149
From STL
Elite
Jul 21
Denver, United States
76% AI deal score
$638
$505
Save $133
From STL
Elite
Jul 28
Denver, United States
76% AI deal score
$635
$505
Save $130
From STL
Elite
Jul 29
Denver, United States
76% AI deal score
$635
$505
Save $130
From STL
Elite
Aug 27
Denver, United States
76% AI deal score
$753
$559
Save $194
From STL
Elite
Aug 21
Denver, United States
76% AI deal score
$819
$586
Save $233
From STL
Elite
Aug 13
Denver, United States
76% AI deal score
$868
$613
Save $255
From STL
Elite
Aug 22
Denver, United States
76% AI deal score
$874
$613
Save $261
From STL
Elite
Aug 15
Denver, United States
76% AI deal score
$895
$613
Save $282
From STL
Elite
Jul 21
Denver, United States
76% AI deal score
$651
$487
Save $164
From STL
Elite
Jul 08
Denver, United States
76% AI deal score
$640
$487
Save $153
From STL
Elite
Jul 15
Denver, United States
76% AI deal score
$650
$487
Save $163
From STL
Elite
Aug 06
Denver, United States
76% AI deal score
$882
$541
Save $341
From STL
Elite
Aug 12
Denver, United States
76% AI deal score
$881
$541
Save $340
From STL
Elite
Jul 15
Denver, United States
75% AI deal score
$617
$505
Save $112
From STL
Elite
Sep 02
Denver, United States
75% AI deal score
$652
$505
Save $147
From STL
Elite
Jul 29
Denver, United States
75% AI deal score
$720
$554
Save $166
From STL
Elite
Jul 21
Denver, United States
75% AI deal score
$727
$554
Save $173
From STL
Elite
Jul 28
Denver, United States
75% AI deal score
$708
$554
Save $154
From STL
Elite
Aug 12
Denver, United States
75% AI deal score
$750
$559
Save $191
From STL
Elite
Aug 17
Denver, United States
75% AI deal score
$737
$559
Save $178
From STL
Elite
Oct 07
Denver, United States
75% AI deal score
$755
$559
Save $196
From STL
Elite
Aug 01
Denver, United States
75% AI deal score
$780
$593
Save $187
From STL
Elite
Oct 07
Denver, United States
75% AI deal score
$810
$541
Save $269
From STL
Elite
Oct 07
Denver, United States
75% AI deal score
$791
$541
Save $250
From STL
Elite
Aug 10
Denver, United States
75% AI deal score
$911
$580
Save $331
From STL
Elite
Sep 22
Denver, United States
74% AI deal score
$727
$559
Save $168
From STL
Elite
Sep 22
Denver, United States
74% AI deal score
$796
$541
Save $255
From STL
Elite
Sep 01
Denver, United States
74% AI deal score
$809
$541
Save $268
From STL
Elite
Jul 27
Denver, United States
70% AI deal score
$735
$586
Save $149
From STL
Elite
Jul 15
Denver, United States
70% AI deal score
$723
$586
Save $137
From STL
Elite
Jul 25
Denver, United States
70% AI deal score
$652
$536
Save $116
From STL
Elite
Aug 06
Denver, United States
69% AI deal score
$736
$613
Save $123
From STL
Elite
Jul 07
Denver, United States
69% AI deal score
$644
$536
Save $108
From STL
Elite
Jul 14
Denver, United States
69% AI deal score
$646
$536
Save $110
From STL
Elite
Jul 28
Denver, United States
69% AI deal score
$648
$536
Save $112
From STL
Elite
Jul 21
Denver, United States
69% AI deal score
$646
$536
Save $110
From STL
Elite
Aug 11
Denver, United States
68% AI deal score
$2,002
$1,498
Save $504
From STL
Elite
Aug 11
Denver, United States
68% AI deal score
$1,955
$1,512
Save $443
From STL
Elite
Sep 23
Denver, United States
68% AI deal score
$2,285
$1,647
Save $638
From STL
Elite
Jul 29
Denver, United States
68% AI deal score
$616
$544
Save $72
From STL
Elite
Jul 25
Denver, United States
68% AI deal score
$627
$554
Save $73
From STL
Elite
Jul 28
Denver, United States
68% AI deal score
$624
$559
Save $65
From STL
Elite
Jul 29
Denver, United States
68% AI deal score
$624
$559
Save $65
From STL
Elite
Jul 30
Denver, United States
68% AI deal score
$677
$586
Save $91
From STL
Elite
Aug 13
Denver, United States
68% AI deal score
$731
$613
Save $118
From STL
Elite
Aug 27
Denver, United States
68% AI deal score
$719
$613
Save $106
From STL
Elite
Aug 24
Denver, United States
68% AI deal score
$722
$613
Save $109
From STL
Elite
Aug 05
Denver, United States
67% AI deal score
$1,987
$1,578
Save $409
From STL
Elite
Jul 20
Denver, United States
67% AI deal score
$1,914
$1,584
Save $330
From STL
Elite
Aug 05
Denver, United States
67% AI deal score
$1,929
$1,592
Save $337
From STL
Elite
Jul 20
Denver, United States
67% AI deal score
$2,070
$1,638
Save $432
From STL
Elite
Aug 05
Denver, United States
67% AI deal score
$2,018
$1,677
Save $341
From STL
Elite
Aug 05
Denver, United States
67% AI deal score
$2,060
$1,682
Save $378
From STL
Elite
Jul 20
Denver, United States
67% AI deal score
$2,111
$1,683
Save $428
From STL
Elite
Jul 20
Denver, United States
67% AI deal score
$2,136
$1,683
Save $453
From STL
Elite
Jul 11
Denver, United States
67% AI deal score
$2,058
$1,693
Save $365
From STL
Elite
Jul 11
Denver, United States
67% AI deal score
$2,082
$1,738
Save $344
From STL
Elite
Jul 11
Denver, United States
67% AI deal score
$2,124
$1,738
Save $386
From STL
Elite
Jul 28
Denver, United States
67% AI deal score
$616
$559
Save $57
From STL
Elite
Jul 29
Denver, United States
67% AI deal score
$616
$559
Save $57
From STL
Elite
Jul 15
Denver, United States
67% AI deal score
$634
$586
Save $48
From STL
Elite
Jul 18
Denver, United States
67% AI deal score
$650
$603
Save $47
From STL
Elite
Aug 11
Denver, United States
66% AI deal score
$1,924
$1,632
Save $292
From STL
Elite
Jul 20
Denver, United States
66% AI deal score
$1,911
$1,643
Save $268
From STL
Elite
Jul 20
Denver, United States
66% AI deal score
$1,983
$1,683
Save $300
From STL
Elite
Jul 20
Denver, United States
66% AI deal score
$1,903
$1,683
Save $220
From STL
Elite
Jul 20
Denver, United States
66% AI deal score
$1,903
$1,688
Save $215
From STL
Elite
Jul 11
Denver, United States
66% AI deal score
$1,976
$1,693
Save $283
From STL
Elite
Jul 11
Denver, United States
66% AI deal score
$1,918
$1,699
Save $219
From STL
Elite
Jul 20
Denver, United States
66% AI deal score
$1,968
$1,718
Save $250
From STL
Elite
Jul 11
Denver, United States
66% AI deal score
$1,984
$1,738
Save $246
From STL
Elite
Jul 11
Denver, United States
66% AI deal score
$2,005
$1,738
Save $267
From STL
Elite
Jul 11
Denver, United States
66% AI deal score
$1,978
$1,738
Save $240
From STL
Elite
Aug 12
Denver, United States
66% AI deal score
$2,001
$1,763
Save $238
From STL
Elite
Jul 11
Denver, United States
66% AI deal score
$1,993
$1,773
Save $220
From STL
Elite
Jul 11
Denver, United States
66% AI deal score
$2,149
$1,843
Save $306
From STL
Elite
Jul 29
Denver, United States
66% AI deal score
$629
$586
Save $43
From STL
Elite
Jul 11
Denver, United States
65% AI deal score
$1,932
$1,738
Save $194
From STL
Elite
Jul 11
Denver, United States
65% AI deal score
$1,923
$1,738
Save $185
From STL
Elite
Aug 12
Denver, United States
65% AI deal score
$1,956
$1,763
Save $193
From STL
Elite
Jul 11
Denver, United States
65% AI deal score
$1,918
$1,773
Save $145
From STL
Elite
Aug 01
Denver, United States
65% AI deal score
$2,035
$1,843
Save $192
From STL
Elite
Aug 01
Denver, United States
65% AI deal score
$2,004
$1,843
Save $161
From STL
Elite
Sep 05
Denver, United States
65% AI deal score
$653
$613
Save $40
From STL
Elite
Aug 01
Denver, United States
50% AI deal score
$780
$740
Save $40