Cheap flights from Denver to St. Louis

Denver
DEN
Lambert-St. Louis
STL

Flight deals from Denver to St. Louis

Below you can see the best deals on flights Denver — St. Louis for upcoming dates. Direct and connecting flights from various airlines — compare prices and choose the right ticket.

The lowest price for the next 2 months is on 11 September, from $33.

Top 10 cheap flights from Denver to St. Louis

F9
$ 33

Denver — St. Louis

16:12—19:17
11 Sep 2026
2 h 5 m
Direct flight
F9
$ 60

Denver — St. Louis

16:12—19:17
9 Sep 2026
2 h 5 m
Direct flight
F9
$ 60

Denver — St. Louis

16:12—19:17
12 Sep 2026
2 h 5 m
Direct flight
F9
$ 62

Denver — St. Louis

16:12—19:17
14 Sep 2026
2 h 5 m
Direct flight
F9
$ 67

Denver — St. Louis

16:00—19:13
31 Aug 2026
2 h 13 m
Direct flight
F9
$ 68

Denver — St. Louis

16:00—19:13
6 Sep 2026
2 h 13 m
Direct flight
F9
F9
$ 78

Denver — St. Louis

10:09—16:31
1 Sep 2026
5 h 22 m
1 stop
F9
F9
$ 78

Denver — St. Louis

10:00—17:50
1 Sep 2026
6 h 50 m
1 stop
F9
F9
$ 78

Denver — St. Louis

10:00—17:50
2 Sep 2026
6 h 50 m
1 stop
F9
DL
$ 78

Denver — St. Louis

20:15—23:16
8 Sep 2026
26 h 1 m
1 stop

Prices were found in the last 72 hours and may change — check the exact price when you continue.

About the Denver — St. Louis flight

Looking for cheap flights from Denver to St. Louis? Compare fares from different airlines, check the flight schedule and travel time — and book your Denver — St. Louis ticket online at the best price.

The route has direct flights — around 87 flights per week, flights are operated by United Airlines, Southwest Airlines, Frontier Airlines, a nonstop flight takes about 2 h 7 min, the distance between the cities is around 1,282 km.

Planning your trip? You may find our St. Louis travel guide, how to get from the airport into town and St. Louis weather forecast useful. To catch a low fare, use the low-price calendar and the monthly price chart on this page.

Facts about this route

from $33Min. price
SeptemberCheapest
MayPeak season
YesDirect flights
1,282 kmDistance
2 h 7 minTravel time
3Airlines
87 / wkFlights

Flight schedule from Denver to St. Louis

The table shows direct flights from Denver to St. Louis on the selected date. The flight takes approximately 2 h 7 min. Regular flights are operated by United Airlines, Southwest Airlines and Frontier Airlines. Departures from Denver International Airport and Centennial Airport airports, arrivals at Lambert-St. Louis International Airport.

For each flight, the following details are shown: departure time (local), arrival city and airport, flight number and airline, terminal or gate, and status. Click on a flight to open its details and go to ticket search. To view flights on a different day, change the date above the table.

Today
Any time
Last update: 15 Aug 2026

Flight ticket prices by day: Denver — St. Louis

Below is a calendar of the lowest flight ticket prices for Denver — St. Louis by day. Pick a convenient date and instantly see the fare. The cheapest flights on this route start from $33 in September, and the most expensive are around $193 in May. If your travel dates are flexible, the calendar will help you find the best price for your preferred period. To view round-trip fares, switch to the "Round trip" tab above the calendar, select your departure date — and the right-hand calendar will highlight the lowest prices for return flights on each day.

 
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Prices by month

Average one-way fares from Denver to St. Louis by month. Tickets are usually cheapest in January (around $123) and priciest in July (about $185) — use the table and chart below to pick the best time to fly.

MonthAverage priceLevelMonthAverage priceLevelMonthAverage priceLevel
Jan$123lowMay$161mediumSep$147medium
Feb$133mediumJun$180highOct$137low
Mar$171highJul$185highNov$142medium
Apr$152mediumAug$166mediumDec$175high

Some values are estimated based on seasonality.

When to fly

Weather in St. Louis: it is warmest in July (up to 31 °C on average) and coolest in January (around 5 °C). The driest month is September.

Tickets are usually cheapest in September and most expensive in May. Compare prices and weather by month in the charts below to pick the best time to fly.

Temperature · St. Louis

Dry and wet days · St. Louis

Wind speed and direction · St. Louis

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How to get the best deal on a Denver — St. Louis ticket

  • Book ahead: fares for Denver — St. Louis are usually lower 3–8 weeks before departure than at the last minute.
  • Play with your dates — Tuesday, Wednesday and Saturday departures are often cheaper than Friday and Sunday.
  • Denver is served by more than one airport — compare fares and travel time to each before you book.
  • The cheapest month to fly to St. Louis is usually September — plan your trip around it if your dates are flexible.
  • Compare direct and connecting flights: nonstop is faster, while a connection is sometimes noticeably cheaper.
  • Watch the low-price calendar and the monthly price trend on this page — they make it easier to catch a good date.
  • Travelling light? Pick a cabin-baggage-only fare — tickets without checked luggage are noticeably cheaper.
  • Get to the airport in good time — about 2–3 hours before an international departure and roughly an hour before a domestic one.

Airlines

Flights on the Denver — St. Louis route are operated by 3 airlines; United Airlines runs the most flights (around 51% of all flights). Compare carriers, flight shares and schedules below.

  • United AirlinesUA
    15x/week
    WebsiteFleet: 956165M pax/year
    • Direct flight DEN → STL15x/week
      Duration
      2h 6m
      Days
      MTWTFSS
    50.6%Open →
  • Southwest AirlinesWN
    10x/week
    WebsiteFleet: 817140M pax/year
    • Direct flight DEN → STL10x/week
      Duration
      2h 3m
      Days
      MTWTFSS
    33.3%Open →
  • Frontier AirlinesF9
    5x/week
    WebsiteFleet: 15329M pax/year
    • Direct flight DEN → STL5x/week
      Duration
      2h 13m
      Days
      MTWTFSS
    16.1%Open →

Cities and airports on the Denver — St. Louis route

Flights Denver — St. Louis depart from Denver International Airport and Centennial Airport and arrive at Lambert-St. Louis International Airport. Below are pages for the cities, countries, and airports on the route: airlines, schedules, and travel guides.

Departure

Denver

DEN
United States
About the cityHow to get thereWeatherAll about the country United States
Arrival

St. Louis

STL
United States
About the cityHow to get thereWeatherAll about the country United States
Departure airports
Arrival airports

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Frequently asked questions about the Denver — St. Louis flight

How long is the flight from Denver to St. Louis?

A nonstop Denver — St. Louis flight takes about 2 h 7 min — the distance between the cities is around 1,282 km.

How far is it from Denver to St. Louis?

The distance from Denver to St. Louis is about 1,282 km, which a nonstop flight covers in around 2 h 7 min.

Are there direct flights from Denver to St. Louis?

Yes, there are nonstop flights Denver — St. Louis — around 87 flights per week.

Which airlines fly from Denver to St. Louis?

Airlines operating Denver — St. Louis include United Airlines, Southwest Airlines, Frontier Airlines. See the full list with schedules in the "Airlines" section on this page.

Which airports do Denver — St. Louis flights use?

Flights from Denver depart from Denver International Airport, Centennial Airport, and arrive at Lambert-St. Louis International Airport. If a city has more than one airport, check which one your ticket uses before you travel.

How much is a ticket from Denver to St. Louis?

The price of a Denver — St. Louis ticket depends on your travel date, season and demand: it is usually cheapest to fly in September, and most expensive in May. Tickets typically cost between $33 and $193. Check the current lowest fare and low-price calendar on this page.

When is the best time to book flights Denver — St. Louis?

Flights Denver — St. Louis are usually cheaper when booked in advance — a few weeks before departure and away from peak dates; the most budget-friendly month to fly is September. Compare prices by month in the price trend chart on this page.

How can I find the cheapest flights from Denver to St. Louis?

To catch a low fare Denver — St. Louis, book a few weeks in advance, keep your dates flexible, and compare airlines and connecting options. The low-price calendar and monthly price chart on this page show the cheapest days and months at a glance: the most budget-friendly month to fly is usually September.

How early should I arrive at the airport?

For international flights, plan to be at the airport about 2–3 hours before departure, and around an hour before a domestic flight. Allow extra time during busy travel seasons and at large hubs, where check-in and security lines can be longer.

Where else you can fly from Denver

See all
Los AngelesSeattlePhoenixNew York CitySalt Lake CitySan DiegoDallasLas VegasMinneapolisChicagoHoustonAtlantaPortlandAustinColorado SpringsSan FranciscoWashington, D.C.OrlandoKansas CityNashvilleSanta AnaDetroitOklahoma CityAspenRapid CityMiamiPhiladelphiaSacramentoAlbuquerqueBostonWichitaSan JoseBoiseMidlandCharlotteGrand JunctionOmahaSan AntonioTulsaVancouver

Where else you can fly from St. Louis

See all
ChicagoDallasNew York CityAtlantaSeattleMinneapolisTorontoHoustonCharlotteWashington, D.C.DetroitBostonPortlandOrlandoPhoenixPhiladelphiaMiamiSalt Lake CityMontrealLos AngelesLas VegasCancunJonesboroFort LauderdaleSan FranciscoLondonTampaFrankfurt am MainPunta CanaQuincyManhattan

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