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Find cheap Frontier flights to St. Louis

CMH — STL
Aug 26 — Sep 21
Wed 8/26
Wed 9/2
1 adult, Economy
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Find Frontier flight deals to St. Louis

Cheapest Frontier flights from USA to St. Louis
Explore the most affordable Frontier flight options available from USA to St. Louis. Find the lowest fares with prices last updated on July 27, 2026.

This Cheapflightsfares deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/134:43 pm
ATL
-
STL
Nonstop1h 54m
Frontier
Sun 8/166:34 pm
STL
-
ATL
Nonstop2h 03m
Frontier
Deal found 7/23$72
This Super.com deal was found by Cheapflights users on 7/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/128:05 am
ATL
-
STL
Nonstop1h 52m
Frontier
Mon 8/174:57 pm
STL
-
ATL
Nonstop1h 59m
Frontier
Deal found 7/27$77
This Frontier deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/128:05 am
ATL
-
STL
Nonstop1h 52m
Frontier
Sat 8/154:57 pm
STL
-
ATL
Nonstop1h 59m
Frontier
Deal found 7/25$82

Flights to St. Louis with Frontier at a glance

Find detailed information about Frontier flights from USA to St. Louis. Explore the options provided by Frontier to plan your journey from USA to St. Louis. Data last updated July 27, 2026.

Popular in

June

Cheapest in

February

Average price

$193

Round-trip from

$72

One-way from

$23

Good round-trip deal

$273 or less
Highest demand for flights to St. Louis with Frontier; 18% potential price increase.
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Best time to find cheap flights to St. Louis with Frontier; 2% potential price drop.
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Average price for flights to St. Louis with Frontier (round-trip).
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Frontier
  • Frontier
  • 8/13-8/16
  • Nonstop
  • 3h 57m total
  • USA to St. Louis
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Frontier
  • Frontier
  • 8/24
  • Nonstop
  • 1h 54m total
  • USA to St. Louis
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Price to beat on a round-trip flight from the United States to St. Louis with Frontier.
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Cheapflights Insights

Find cheap Frontier flights to St. Louis

How long is the flight to St. Louis with Frontier?

On average, Frontier flights from the United States to St. Louis take 2 hours 3 minutes. Flights to St. Louis from other popular cities in the United States will vary in length. Below are a few examples of popular routes and their flight times.

Frontier weekly flight availability to St. Louis

The most flights to St. Louis operated by Frontier are scheduled on a Tuesday (5 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (4 on average).

When is the best time to book a flight to St. Louis with Frontier?

The best time to book a flight to St. Louis with Frontier is 45 days before departure. On average, fares are higher if you book 89 days before departure.

When is the cheapest time to fly to St. Louis with Frontier?

Users looking for the cheapest Frontier fares to St. Louis should consider flying on Tuesday at noon, when prices are typically cheapest. Budget-minded travellers will want to avoid Wednesday at noon, when prices are usually at their highest.

FAQs about flights to St. Louis with Frontier

  • Which airport do Frontier flights arrive at when travelling to St. Louis?

    Frontier flights on this route tend to land at Lambert-St Louis Airport.

  • Is Frontier the cheapest airline for a flight to St. Louis?

    Flight prices will depend on many factors like date, time and cabin class so it is worth comparing flights before booking. Based on Cheapflights data the cheapest average return price for flights to St. Louis tends to be with Allegiant Air.

  • Are there alternative airlines other than Frontier that fly to St. Louis?

    Southwest, American Airlines and Delta all fly to St. Louis and offer an alternative to Frontier.

  • How much is a flight to St. Louis with Frontier?

    The average price for a return flight with Frontier is $232; with a one-way flight around $152.

See more FAQs

Reviews of Frontier

See what Cheapflights users have to say about their Frontier experience.
Frontier
5.6
Fair
2,753 reviews
Overview

Boarding

5.9

Comfort

5.4

Crew

6.6

Food

4.5

Entertainment

4.3

Popular Frontier flights

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