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Cheap flights from Detroit to St. Louis

DTT — STL
13 Oct — 20 Oct1
1 adult
1 adult, Economy, 0 bags

Find flight deals from Detroit to St. Louis

Popular in

January

Cheapest in

September

Average price

C$ 373

Good round-trip deal

C$ 310 or less
Highest demand for flights based on searches. 10% potential increase in price (C$ 86 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease (C$ 27 potential savings vs. average RT price).
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Average for round-trip flights in September 2026
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Price to beat on a round-trip flight from Detroit (DTT) to Lambert-St Louis.
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Best time to book a flight from Detroit to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Detroit with our price prediction graph.
Estimated round-trip price

Cheapflights Insights

Everything you need to know about your flight from Detroit to St. Louis

How far ahead should I book a flight from Detroit to St. Louis?

To ensure you get the cheapest price possible for a flight from Detroit to St. Louis, you should look to book at least 43 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from Detroit to St. Louis?

Currently, September is the cheapest month in which you can book a flight from Detroit to St. Louis (average of C$ 406). Flying from Detroit to St. Louis in April is currently the most expensive (average of C$ 601). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from DTT to STL?

One of the essential ways to save on airfare from Detroit to St. Louis is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight at noon could potentially save you up to 28% on airfare.

Related info for your journey

  • What are the most reliable airlines from Detroit to St. Louis?

    No one likes to see their flight delayed. When booking a flight from Detroit to St. Louis consider choosing Air France (87%), Korean Air (87%) or WestJet (81%) as they are the most reliable in getting you off to your destination on time.

  • Can I find deals for flights from Detroit to St. Louis that include hotel bookings?

    Yes. In addition to deals on Detroit to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Detroit to St. Louis?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Detroit to St. Louis.

  • Can I find deals for business class flights from Detroit to St. Louis?

    Yes. Cheapflights offers flight deals from Detroit to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Detroit to St. Louis?

    Currently, September is the cheapest month in which you can book a flight from Detroit to St. Louis (average of C$ 406). Flying from Detroit to St. Louis in April is currently the most expensive (average of C$ 601). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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Travelling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
Chesterfield

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How does Cheapflights help users find flights from Detroit to St. Louis?

Cheapflights makes it easy to find Detroit to St. Louis flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from Detroit to St. Louis?

Cheapflights simply makes it quick and affordable to book flights from Detroit to St. Louis by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

Can Cheapflights find flights from Detroit to St. Louis with no change fees?

Need flexible booking options for your flight to St. Louis from Detroit? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from Detroit to St. Louis become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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