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Find cheap Frontier flights to St. Louis from $40

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Flights Deals

Cheap Frontier Flight Deals to St. Louis

 
Here are some of the best deals found on KAYAK recently from Frontier to St. Louis that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.

Recent round-trip Frontier flight deals to St. Louis

KAYAK's recommended round-trip Frontier deals departing in the coming months to St. Louis.
Discover the best prices for you by selecting your travel dates on KAYAK.
Frontier Logo
7:00 am - 10:08 amDEN-STL
2h 08mnonstop
Frontier Logo
7:29 pm - 8:56 pmSTL-DEN
2h 27mnonstop
$116Frontier
Find Deal
Wed, Jun 11 - Wed, Jun 18
Frontier Logo
7:00 am - 10:08 amDEN-STL
2h 08mnonstop
Frontier Logo
7:29 pm - 8:56 pmSTL-DEN
2h 27mnonstop
$131Frontier
Find Deal
Wed, Jun 11 - Fri, Jun 13
Frontier Logo
5:30 pm - 7:23 pmDFW-STL
1h 53mnonstop
Frontier Logo
8:44 pm - 10:40 pmSTL-DFW
1h 56mnonstop
$136Frontier
Find Deal
Thu, Aug 7 - Sun, Aug 10
Frontier Logo
5:30 pm - 7:24 pmDFW-STL
1h 54mnonstop
Frontier Logo
8:44 pm - 10:42 pmSTL-DFW
1h 58mnonstop
$138Frontier
Find Deal
Thu, Jun 12 - Sun, Jun 15
Frontier Logo
6:00 am - 9:09 amDEN-STL
2h 09mnonstop
Frontier Logo
7:24 pm - 8:51 pmSTL-DEN
2h 27mnonstop
$138Frontier
Find Deal
Fri, May 30 - Mon, Jun 2
Frontier Logo
5:30 pm - 7:24 pmDFW-STL
1h 54mnonstop
Frontier Logo
8:44 pm - 10:42 pmSTL-DFW
1h 58mnonstop
$139Frontier
Find Deal
Thu, Jun 12 - Sun, Jun 15
Frontier Logo
6:00 am - 9:12 amDEN-STL
2h 12mnonstop
Frontier Logo
7:29 pm - 8:56 pmSTL-DEN
2h 27mnonstop
$139Frontier
Find Deal
Wed, Jun 25 - Mon, Jun 30
Frontier Logo
6:00 am - 9:12 amDEN-STL
2h 12mnonstop
Frontier Logo
7:29 pm - 8:56 pmSTL-DEN
2h 27mnonstop
$148Frontier
Find Deal
Fri, Jun 20 - Mon, Jun 23
Frontier Logo
6:50 am - 9:59 amDEN-STL
2h 09mnonstop
Frontier Logo
6:53 pm - 8:22 pmSTL-DEN
2h 29mnonstop
$149Frontier
Find Deal
Wed, May 14 - Fri, May 16
Frontier Logo
6:00 am - 9:11 amDEN-STL
2h 11mnonstop
Frontier Logo
7:29 pm - 8:58 pmSTL-DEN
2h 29mnonstop
$150Frontier
Find Deal
Wed, Jul 16 - Mon, Jul 21
Useful Info

Good to know

Low seasonJanuary
High seasonMay
Cheapest flight$40
Average price round-trip$216
Good deal round-trip$143
Best time to beat the crowds with an average 2% drop in price.
Most popular time to fly and prices are also 4% lower on average.
Flight from Denver to St. Louis
(avg. price over the last 2 weeks)
or less

When to book flights with Frontier to St. Louis

Average price per month
Flight prices as travel date approaches

FAQs for flying to St. Louis with Frontier

  • Is Frontier cheaper than other airlines flying to St. Louis?

    Frontier is the cheapest airline flying to St. Louis with an average return price of $247. Flights to St. Louis with Spirit Airlines cost $286 on average, while Delta cost $313.

  • Which other airlines fly to St. Louis?

    Along with Frontier, you can also fly to St. Louis with Delta, Southwest, American Airlines, United Airlines, Spirit Airlines and Delta.

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

    On average, Frontier flights to St. Louis cost $247 for a round-trip.

  • Which airport do Frontier flights to St. Louis fly into?

    You’ll fly into St. Louis Lambert Airport when flying to St. Louis with Frontier.

Top tips for your flights to St. Louis with Frontier

  • The cheapest flight to St. Louis with Frontier found on KAYAK in the last 2 weeks departed from Orlando Airport and cost $101.

Frontier customer reviews

5.9
FairBased on 3,287 verified guest reviews
6.2Boarding
4.8Food
5.6Comfort
4.6Entertainment
6.8Crew
Pros +
Cons -
  • On the ticket it said checked bag. (in 1044 reviews)
Show reviews that mention
Traveler rating:
Sort by:
A
2.0 Poor
The reps working at the airport counter were dumber than a second coat of paint.
D
2.0 Poor
Less chaos and timely departure
A
4.0 Mediocre
My costume jewelry was stolen out of my bag. Got to airport and my bag weighed 45 pounds- 5 pounds over cost me $100 Long lines in tier one. No entertainment No WiFi no free drinks or snacks
A
6.0 Okay
Not very good. Paid in excess of $400 for assigned seating for my family and that was not provided. I want that money back.
A
2.0 Poor
The seats were hard molded plastic covered in plastic vinyl. And the scam to charge people extra to sit together. Don’t they know we can just ask someone to trade seats. And watching the staff separate young children from parents… super classy. We had to guilt them into offering up our seats. This companies policies suck. Don’t give them your money.
A
2.0 Poor
The seats were awful, hard plastic covered in sheet vinyl. The airline tries to scam you into paying extra to get seat together when the flight wasn’t full. They were going to separate a family with young children but my wife who had a row to herself gave up her seat so the young mom could be with her young boys. I’m never giving this airline my money again.
A
10.0 Wonderful
It was a short flight so no food or entertainment….
N
2.0 Poor
Frontier is a scam! Do not sell this airline.
G
8.0 Very good
Seats are uncomfortable but price is good. Guess I can put up with misery for four hours.
A
10.0 Wonderful
Best ever app invented
Read more about Frontier

Everything you need to know for your flight to St. Louis

Other airlines flying to St. Louis

Flight deals from the most popular airlines with KAYAK users flying the route
American Airlines flights to St. Louis
Delta flights to St. Louis
United Airlines flights to St. Louis
Southwest flights to St. Louis
Alaska Airlines flights to St. Louis

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