CA $147 Cheap Flights from Denver (DEN) to St. Louis (STL)

You can find cheap one-way flights from CA $147 and cheap return flights CA $293 DEN to STL with Expedia. One-way flights typically cost between CA$265 and CA$814. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when DEN to STL ticket fares go up or down.

The cheapest months to fly from Denver, CO (DEN) to St. Louis, MO (STL) are typically during off-peak season when demand is low. Traveling in off-peak or shoulder months is usually a good way to secure cheap tickets, just remember to avoid flying during holidays if you are able to. Use the calendar view in your search to see which months have low fares on this route.

You have 3 airlines offering direct flights from Denver, CO (DEN-Denver Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.). Here are the carriers:

* Southwest Airlines operates 49 direct flights from DEN to STL every week.
* United operates 32 direct flights from DEN to STL every week.
* Frontier Airlines operates 7 direct flights from DEN to STL every week.

Frontier Airlines is one of the cheapest airlines offering nonstop return flights from Denver Intl. (DEN) to Lambert-St. Louis Intl. (STL), with tickets starting from around CA$66 for flights that can be booked for departure within the next year. American Airlines is one of the cheapest airlines offering connecting return flights from Denver Intl. (DEN) to Lambert-St. Louis Intl. (STL), with tickets starting from around CA$266. These prices are per adult, for economy/coach class. Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.

To find a cheap flight from Denver, CO (DEN-Denver Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.

The best airline to fly with from Denver, CO (DEN-Denver Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) will differ from traveler to traveler. If you like to fly early, Southwest Airlines offers early morning flights. If price is the most important factor, Frontier Airlines typically offers the lowest fares. Southwest Airlines offers the most daily flights from Denver, CO (DEN-Denver Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.), which is great if flexibility is what you value most. The best carrier for this journey could also be the one you have a loyalty membership with, as flying with that airline or another airline within the same alliance could help you collect points or enjoy lounge access.

The best time to fly from Denver, CO (DEN-Denver Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) is typically September or August. These months offer a great balance, with average return flight prices around CA$381. While these are the cheapest months, they also tend to be popular times to travel, meaning you'll likely find plenty of flight options to suit your schedule. If you're flexible, these months give you both affordable fares and excellent flight schedules to work with.

You'll find around 13 nonstop flights per day from Denver International (DEN) to Lambert-St. Louis International (STL). For even more choices, look at flights that include layovers, as there are approximately 172 connecting flights per day. Some common connection points include Seattle - Tacoma International (SEA), O'Hare International (ORD), and Portland International (PDX).

The earliest flight from Denver, CO (DEN-Denver Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) typically departs around 12:00 AM local time, operated by Frontier Airlines. This is a seasonal service, active in August, September, and October. An early departure like this can help you make the most of your time at your destination. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.

You'll typically find the most flights from Denver, CO (DEN-Denver Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) on a Friday, with around 117 flights available. This gives you plenty of options for your travel plans. Major airlines on this route include Southwest Airlines, Delta, and American Airlines. Friday offers notably more flight options compared to other days of the week, making it a good day to consider if you need flexibility.

The most popular departure times for flights from Denver International Airport (DEN) to Lambert-St. Louis International Airport (STL) are in the early morning, from 6am to 9am. Many major carriers, including Southwest Airlines, American Airlines and Frontier Airlines, offer flights during this window. Many travellers prefer these times because they allow for an early start to their day in St. Louis.

Flying nonstop from DEN to STL takes around 2 hours, with the route covering approximately 1,236 kilometers. Flights with a layover typically take 3 hours 50 minutes longer than direct options. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.

Yes, you can fly business class or first class between DEN and STL. You can fly business class with Frontier Airlines and Delta.

First class cabins are available on Alaska Airlines, Delta, United, and American Airlines.

It's easy to earn miles on a Denver, CO (DEN) to St. Louis, MO (STL) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.

*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.

If you're planning to travel to St. Louis from Denver Intl. (DEN), you can fly directly into Lambert-St. Louis Intl. (STL) which offers international flights and connections. Some flights may connect through major hubs like Portland Intl. (PDX), Love Field (DAL), or Seattle - Tacoma Intl. (SEA) before reaching St. Louis. Compare routes and airports on Expedia to find the best flight options for your travel plans.

Typically, booking a last minute flight from Denver, CO (DEN) to St. Louis, MO (STL) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.

Securing a Denver, CO (DEN) to St. Louis, MO (STL) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.

If you booked your Denver, CO (DEN-Denver Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.