STL - FLG

$385 Find Cheap Flights from St. Louis to Flagstaff

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to Flagstaff departing on 9/23. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Flagstaff

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Flagstaff, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from St. Louis to Flagstaff, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$512
Typical prices: $450-$560
American Airlines
Fri 8/21Sat 9/5
STL - FLG • 1 stop
Cheapest one-way
$385
American Airlines
Wed 9/23
STL - FLG • 1 stop
Nonstop flights
Not available
There are currently no direct flights between St. Louis and Flagstaff. You'll need at least 1 connection.
Insights
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Top layover airports
Denver (DEN)
Cheapest • Avg $349 (round-trip)
Phoenix (PHX)
Shortest trip • 5h 32m (one-way)
Insights
Insights
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Insights
When to travel
July
Cheapest • 100% price drop
September
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Flagstaff!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from St. Louis to Flagstaff (STL-FLG)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from St. Louis to Flagstaff 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.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from St. Louis to Flagstaff

Fri, Aug 21 - Sat, Sep 5
American Airlines Logo
8:00 am - 11:11 am
STL
-
FLG
5h 11m
1 stop
American Airlines Logo
10:30 am - 5:37 pm
FLG
-
STL
5h 07m
1 stop
$512American Airlines
Wed, Oct 14 - Tue, Oct 20
American Airlines Logo
6:34 pm - 10:40 pm
STL
-
FLG
6h 06m
1 stop
American Airlines Logo
12:36 pm - 7:46 pm
FLG
-
STL
5h 10m
1 stop
$538American Airlines
Mon, Jul 20 - Mon, Jul 27
American Airlines Logo
8:38 am - 11:57 am
STL
-
FLG
5h 19m
1 stop
American Airlines Logo
12:37 pm - 9:48 pm
FLG
-
STL
7h 11m
1 stop
$550American Airlines
Sun, Jul 5 - Sat, Jul 11
American Airlines Logo
8:01 am - 11:08 am
STL
-
FLG
5h 07m
1 stop
American Airlines Logo
6:50 am - 1:53 pm
FLG
-
STL
5h 03m
1 stop
$577American Airlines
Sat, Jul 11 - Sat, Jul 18
American Airlines Logo
8:38 am - 11:57 am
STL
-
FLG
5h 19m
1 stop
American Airlines Logo
10:17 am - 11:58 pm
FLG
-
STL
11h 41m
2 stops
$582American Airlines
Wed, Oct 14 - Tue, Oct 20
American Airlines Logo
3:33 pm - 7:24 pm
STL
-
FLG
5h 51m
1 stop
American Airlines Logo
10:18 am - 7:46 pm
FLG
-
STL
7h 28m
2 stops
$612American Airlines
Sun, Jul 5 - Sat, Jul 11
American Airlines Logo
8:01 am - 11:08 am
STL
-
FLG
5h 07m
1 stop
American Airlines Logo
10:17 am - 9:48 pm
FLG
-
STL
9h 31m
2 stops
$617American Airlines
Sat, Jul 4 - Thu, Jul 9
American Airlines Logo
7:01 am - 11:57 am
STL
-
FLG
6h 56m
1 stop
American Airlines Logo
12:37 pm - 7:53 pm
FLG
-
STL
5h 16m
1 stop
$649American Airlines
Sat, Jul 4 - Thu, Jul 9
American Airlines Logo
8:38 am - 11:57 am
STL
-
FLG
5h 19m
1 stop
American Airlines Logo
1:50 pm - 12:16 am
FLG
-
STL
8h 26m
2 stops
$659American Airlines
Mon, Jul 20 - Mon, Jul 27
American Airlines Logo
7:07 am - 1:20 pm
STL
-
FLG
8h 13m
2 stops
American Airlines Logo
12:37 pm - 9:48 pm
FLG
-
STL
7h 11m
1 stop
$663American Airlines
Booking Insights

KAYAK's insights & trends for St. Louis to Flagstaff flights

Get data-powered insights and trends into flights from St. Louis to Flagstaff to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest month to fly from St. Louis to Flagstaff?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from St. Louis to Flagstaff, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from St. Louis to Flagstaff is July, where tickets cost $0 (return) on average. On the other hand, the most expensive months are December and June, where the average cost of round-trip tickets is $791 and $762 respectively.

Find deals

Good to know

Low seasonAugust
Cheapest flight$385
Best time to beat the crowds with an average 23% drop in price.
Most popular time to fly and prices are also 17% lower on average.
Flight from St. Louis to Flagstaff

When to book flights from St. Louis to Flagstaff

Are your dates flexible? Find out the best times to travel from St. Louis to Flagstaff based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from St. Louis to Flagstaff

  • What is the cheapest flight from St. Louis to Flagstaff?

    In the last 5 days, the lowest price for a flight from St. Louis to Flagstaff was $512 for a round-trip ticket.

  • Do I need a passport to fly between St. Louis and Flagstaff?

    Even though you are not required to have a passport, keep in mind that an official ID is needed to board the airplane.

  • Which aircraft models fly most regularly from St. Louis to Flagstaff?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from St. Louis to Flagstaff?

    oneworld is the only airline alliance operating flights between St. Louis and Flagstaff.

  • How does KAYAK find such low prices on flights from St. Louis to Flagstaff?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from St. Louis to Flagstaff.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from St. Louis to Flagstaff?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Flagstaff from St. Louis is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from St. Louis to Flagstaff?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Flagstaff with an airline and back to St. Louis with another airline. Booking your flights between St. Louis and FLG can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from St. Louis to Flagstaff?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Flagstaff from St. Louis up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from St. Louis to Flagstaff

 
See real verified KAYAK customer reviews for airlines flying from St. Louis to Flagstaff. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from St. Louis to Flagstaff? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.1
American AirlinesOverall score based on 11746 reviews
7.5Boarding
6.8Entertainment
7.9Crew
6.4Food
7.2Comfort
Airline reviews

American Airlines is a great dependable airline, on time arrival and departure with polite crew and staff.

10.0 ExcellentAndrew, Jun 2026
OKC - PHX
Read more American Airlines reviews

American Airlines is a great dependable airline, on time arrival and departure with polite crew and staff.

Delayed flight due to maintenance and I have had multiple delayed flights due to maintenance in the last month plus

Movies on my phone are great. It would be nice to have a gluten free snack option.

Seat bottom cushions are not good. I’m 165# & they hurt my butt. Plenty of legroom.

The airplane seats were spacious and comfortable, and the flight attendants were friendly and attentive. The food was delicious like never before. The blankets and toiletries were thoughtfully provided. The captain's navigation was steady and reliable. In short, having flown with Starlux, I won't consider any other airline next time.

Like: flights are on time, good boarding process Can improve: planes are old, improve entertainment and make space more comfortable

My flight got delayed a total of five times. And the boarding gate changed four times. most of the time the platform was not up-to-date with the changes taking place. The most discouraging part of the entire trip by far.

American delayed the flight for a crew rest period. The delay occurred late in the evening - the earliest i can find is 10:20 pm. With a 6 am flight anyone on the flight would have already have been asleep (unless you are insane, a vampire or on drugs) and at least for me i was already on the way to the airport at 445 am the next morning when i discovered they delayed the flight until 9 am. Given the incoming flight was in the air at 6 pm the evening before this should have been figured out a lot more timely that was there only crew to use. Just frustrating given there is no consideration for customer experience anymore in flying.

Original flight was on time, then late, then changed gates...4 times. Once our newest plane came in, it was fine.

The seats need better cushioning for a nearly 5-hour flight, it was a bit uncomfortable. I'm glad American has free wi-fi but there were was a bout 30 minutes in the middle of the flight when there was no connection which was frustrating.

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

Information on your arrival and departure airports

St. Louis (STL)
Flagstaff (FLG)