STL - FLG

$340 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 3/27. 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
$356
Overall average: $605
American Airlines
Mon 2/9Wed 2/11
STL - FLG • 1 stop
Cheapest one-way
$340
American Airlines
Fri 3/27
STL - FLG • 1 stop
When to travel
September
Cheapest • 22% price drop
March
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

Mon, Feb 9 - Wed, Feb 11
American Airlines Logo
7:45 am - 12:08 pm
STL
-
FLG
5h 23m1 stop
American Airlines Logo
7:24 am - 1:53 pm
FLG
-
STL
5h 29m1 stop
$356American Airlines
Mon, Feb 9 - Wed, Feb 11
American Airlines Logo
7:45 am - 12:08 pm
STL
-
FLG
5h 23m1 stop
American Airlines Logo
12:38 pm - 10:59 pm
FLG
-
STL
9h 21m2 stops
$366American Airlines
Fri, Feb 6 - Tue, Feb 10
American Airlines Logo
5:50 am - 12:48 pm
STL
-
FLG
7h 58m1 stop
American Airlines Logo
1:18 pm - 7:29 pm
FLG
-
STL
5h 11m1 stop
$406American Airlines
Fri, Feb 6 - Tue, Feb 10
American Airlines Logo
7:43 am - 12:08 pm
STL
-
FLG
5h 25m1 stop
American Airlines Logo
7:24 am - 4:14 pm
FLG
-
STL
7h 50m2 stops
$416American Airlines
Fri, Feb 6 - Tue, Feb 10
American Airlines Logo
5:04 pm - 11:44 pm
STL
-
FLG
7h 40m2 stops
American Airlines Logo
12:38 pm - 10:59 pm
FLG
-
STL
9h 21m2 stops
$421American Airlines
Tue, Jan 20 - Fri, Jan 23
American Airlines Logo
7:15 am - 12:48 pm
STL
-
FLG
6h 33m1 stop
American Airlines Logo
12:38 pm - 10:59 pm
FLG
-
STL
9h 21m2 stops
$426American Airlines
Sun, Feb 8 - Fri, Feb 20
American Airlines Logo
7:27 am - 12:08 pm
STL
-
FLG
5h 41m1 stop
American Airlines Logo
5:50 pm - 11:59 pm
FLG
-
STL
5h 09m1 stop
$436American Airlines
Sun, Feb 8 - Wed, Feb 18
American Airlines Logo
8:31 am - 5:31 pm
STL
-
FLG
10h 00m2 stops
American Airlines Logo
12:41 pm - 7:29 pm
FLG
-
STL
5h 48m1 stop
$446American Airlines
Mon, Feb 23 - Fri, Feb 27
American Airlines Logo
8:00 am - 5:19 pm
STL
-
FLG
10h 19m2 stops
American Airlines Logo
1:21 pm - 11:35 pm
FLG
-
STL
9h 14m2 stops
$451American Airlines
Thu, Mar 5 - Mon, Mar 9
American Airlines Logo
7:00 am - 12:11 pm
STL
-
FLG
6h 11m1 stop
American Airlines Logo
4:50 pm - 11:59 pm
FLG
-
STL
5h 09m1 stop
$456American 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 September, where tickets cost $440 (return) on average. On the other hand, the most expensive months are March and January, where the average cost of round-trip tickets is $705 and $620 respectively.

Find deals

Good to know

Low seasonDecember
Cheapest flight$340
Best time to beat the crowds but there is an average 8% increase in price.
Most popular time to fly with an average 24% increase in price.
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 3 days, the lowest price for a flight from St. Louis to Flagstaff was $340 for a one-way ticket and $356 for a round-trip.

  • 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.
7.2
American AirlinesOverall score based on 11094 reviews
6.4Food
7.5Boarding
6.9Entertainment
8.0Crew
7.2Comfort
Airline reviews

The flight was on time and arrived early. The crew were friendly and helpful.

10.0 ExcellentAnissa, Jan 2026
ONT - PHX
Read more American Airlines reviews

The flight was on time and arrived early. The crew were friendly and helpful.

Overall experience was great. Flights were almost on time in departing and we arrived at our destination as scheduled. No issues with amenities or flight crew. Everything went well as as expected. Will fly again with American Airlines in the future!

Boarding was organized and timely. Food was mediocre, especially for first class travel.

I bought wifi and most of the flight could not even use it my apps would just spin. I couldn't even listen to music. super frustrating.

AA delayed the flight for 3 hours and 50 minutes, but delayed the last 2 hours, 30 minutes at a time, so if we knew before, could have stayed at home and worked instead of being at the airport wasting time... The plane's crew was excellent, not their fault.

Liked that it was on time. Staff professional and friendly.

Things were delayed a little. But that didn’t affect my plans. It was fine. I was surprised it was so full thanksgiving day. The crew were friendly and professional.

Everything was good The connects, with no blame to crew. Or pilots. I understand they are short staffed. Everything went well for me. I'll be using you guys again in May if not sooner.

The flight was smooth, the pilot kept us informed about delays and we arrived more of less on time

Terrible. Our luggage was delayed and couldn’t be delivered for several days. We got bad information from the airline agents at baggage claim. We had to pick up our car so we wouldn’t be charged for an extra day. We got lost in the maze of airport parking. The baggage claim agents didn’t offer us any compensation for our extra time and expense. We are tired, hungry and very frustrated.

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)