Cheap flights from Detroit to St. Louis from $78

In general, September is the cheapest month to fly from Detroit to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $293. The month of August is another great option to travel to St. Louis, with average flight prices from Detroit averaging around $331.

The cheapest day to depart on your flight to St. Louis is on a Saturday when prices can be found for as low as $386. 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 Sunday because tickets tend to average around $484. 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 Detroit at noon is the least expensive time of day to depart. momondo users have found prices as low as $347 when looking at flights departing at noon. In the morning is when there is more demand to fly to St. Louis, so prices are often more expensive at around $450 per ticket.

Fly from Detroit Metropolitan Wayne County to Lambert-St Louis for the best Detroit - Lambert-St Louis flight prices

You are more likely to see cheaper flights to St. Louis from Detroit when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $368 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from Detroit for as low as $279 on momondo.

There are 4 cabin classes available to choose from on Detroit to St. Louis flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

You could potentially save up to 22% on your flight if you consider stops on a Detroit to St. Louis flight.

As of September 2026, prices for Detroit to St. Louis flights are approximately 34% more expensive when compared to flights at the same time last year.

Southwest and Delta are the most popular carriers operating from Detroit to Lambert-St Louis

Delta, Southwest and Frontier are the top three most popular airlines that fly to St. Louis from Detroit according to our data. Delta is the first choice among our users, with 57% of people opting to fly with this airline when traveling to St. Louis. Keep in mind that there are 3 different airlines that fly to St. Louis on a routine basis, so you have a few additional options to choose from.

As of September 2026, there are 14 flights per day flying from Detroit to St. Louis. The most common time of day flights depart is 7:00PM, with 50% of flights taking off in the evening.

98 flights are operational weekly from Detroit to St. Louis as of September 2026. The most popular departure day for this route is Mon, with 17% of flights per week taking off on this day.