Cheap flights from Dallas to St. Louis from $40

In general, August is the cheapest month to fly from Dallas to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $226. The month of July is another great option to travel to St. Louis, with average flight prices from Dallas averaging around $235.

The cheapest day to depart on your flight to St. Louis is on a Thursday when prices can be found for as low as $211. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around $469. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

Flying to St. Louis from Dallas in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $282 when looking at flights departing in the afternoon. At noon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $366 per ticket.

Fly from Dallas/Fort Worth to Lambert-St Louis for the best Dallas - Lambert-St Louis flight prices

You are more likely to see cheaper flights to St. Louis from Dallas when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $312 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from Dallas for as low as $208 on momondo.

There are 3 cabin classes available to choose from on Dallas to Lambert-St Louis flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Frontier, Southwest, and Delta are the most popular carriers operating from Dallas to Lambert-St Louis

American Airlines, Southwest and Frontier are the top three most popular airlines that fly to St. Louis from Dallas according to our data. American Airlines is the first choice among our users, with 39% of people opting to fly with this airline when traveling to St. Louis. Keep in mind that there are 4 different airlines that fly to St. Louis on a routine basis, so you have a few additional options to choose from.

The number of flights available between Dallas and St. Louis is 20 per day as of April 2026. The most frequent departure time is 9:00PM, with 43% of daily flights leaving in the afternoon.

As of April 2026, there are 143 flights per week flying from Dallas to St. Louis. The most common day of the week flights depart is Thu, with 24% of flights taking off on this day.