$408+ Cheap flights from Flagstaff to St. Louis (FLG - STL)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/17. Fares are subject to change and may not be available on all flights or dates of travel.
FLG — STL
Oct 8 — Oct 151
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from Flagstaff to St. Louis with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Flagstaff to St. Louis
Cheapest
Best
Last-minute
One-way
Cheapest flights from Flagstaff to St. LouisExplore the most affordable flight options available from Flagstaff to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 8, 2026.
Explore the most affordable flight options available from Flagstaff to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 8, 2026.
This American Airlines deal was found by Cheapflights users on 9/6. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/1512:45 pm -
1 stop7h 14m
Tue 10/202:31 pm -
1 stop8h 08m
Deal found 9/6![American Airlines logo]()
$522
This American Airlines deal was found by Cheapflights users on 9/6. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/166:49 am -
1 stop4h 55m
Tue 9/228:00 am -
1 stop5h 13m
Deal found 9/6![American Airlines logo]()
$552
This American Airlines deal was found by Cheapflights users on 9/6. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1811:43 am -
1 stop7h 09m
Tue 9/222:30 pm -
1 stop7h 37m
Deal found 9/6![American Airlines logo]()
$572
This American Airlines deal was found by Cheapflights users on 9/4. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/96:49 am -
1 stop4h 55m
Sun 9/138:00 am -
1 stop5h 13m
Deal found 9/4![American Airlines logo]()
$587
Best flights from Flagstaff to St. LouisDiscover carefully curated flight deals from Flagstaff to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 8, 2026.
Discover carefully curated flight deals from Flagstaff to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 8, 2026.
This American Airlines deal was found by Cheapflights users on 9/6. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/1512:45 pm -
1 stop5h 03m
Tue 10/2012:47 pm -
2 stops9h 52m
Deal found 9/6![American Airlines logo]()
$535
This American Airlines deal was found by Cheapflights users on 9/7. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1811:43 am -
1 stop7h 09m
Tue 9/222:30 pm -
1 stop7h 37m
Deal found 9/7![American Airlines logo]()
$572
This American Airlines deal was found by Cheapflights users on 9/7. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/111:43 am -
1 stop8h 05m
Tue 10/66:32 am -
1 stop7h 33m
Deal found 9/7![American Airlines logo]()
$572
This American Airlines deal was found by Cheapflights users on 9/8. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1810:40 am -
2 stops11h 03m
Wed 9/237:00 am -
2 stops10h 00m
Deal found 9/8![American Airlines logo]()
$674
Last-minute flights from Flagstaff to St. LouisDiscover last-minute flight deals from Flagstaff to St. Louis. Data last updated September 8, 2026 and is based on user searches.
Discover last-minute flight deals from Flagstaff to St. Louis. Data last updated September 8, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 9/4. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/96:49 am -
1 stop4h 55m
Sun 9/138:00 am -
1 stop5h 13m
Deal found 9/4![American Airlines logo]()
$587
This American Airlines deal was found by Cheapflights users on 9/6. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/166:49 am -
1 stop4h 55m
Tue 9/228:00 am -
1 stop5h 13m
Deal found 9/6![American Airlines logo]()
$552
This American Airlines deal was found by Cheapflights users on 9/6. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1811:43 am -
1 stop7h 09m
Tue 9/222:30 pm -
1 stop7h 37m
Deal found 9/6![American Airlines logo]()
$572
This American Airlines deal was found by Cheapflights users on 9/6. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/1512:45 pm -
1 stop7h 14m
Tue 10/202:31 pm -
1 stop8h 08m
Deal found 9/6![American Airlines logo]()
$522
One-way flights from Flagstaff to St. LouisSearch for one-way flight options from Flagstaff to St. Louis. Find affordable one-way fares based on user searches. Data last updated September 8, 2026.
Search for one-way flight options from Flagstaff to St. Louis. Find affordable one-way fares based on user searches. Data last updated September 8, 2026.
This American Airlines deal was found by Cheapflights users on 9/7. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1711:43 am -
1 stop8h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/7![American Airlines logo]()
$408
Find flight deals from Flagstaff to St. Louis
Discover tips and strategies to find the most affordable flight options for your journey from Flagstaff (FLG) to St. Louis (STL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated September 8, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $522 (American Airlines) |
One-way from | $408 (American Airlines) |
Cheapflights Fare Finder
Customize your flight search to find flights from Flagstaff to St. Louis that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated September 8, 2026.
Use the filters below to find and compare flights from Flagstaff to St. Louis that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Quickest round-trip
FlagstaffSt. Louis
FLG Flagstaff Pulliam - STL Lambert-St Louis
FLGSTL
Flagstaff Pulliam
Thu 11/12
1:22 pm-8:22 pm
1 stop6h 00m
Lambert-St Louis
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$408
FlagstaffSt. Louis
FLG Flagstaff Pulliam - STL Lambert-St Louis
FLGSTL
Flagstaff Pulliam
Thu 9/17
11:43 am-9:48 pm
1 stop8h 05m
Lambert-St Louis
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$408
FlagstaffSt. Louis
FLG Flagstaff Pulliam - STL Lambert-St Louis
FLGSTL
Flagstaff Pulliam
Thu 10/15
12:45 pm-7:48 pm
1 stop5h 03m
Lambert-St Louis
Tue 10/20
12:47 pm-8:39 pm
2 stops9h 52m
$535
FlagstaffSt. Louis
FLG Flagstaff Pulliam - STL Lambert-St Louis
FLGSTL
Flagstaff Pulliam
Fri 9/18
11:43 am-8:52 pm
1 stop7h 09m
Lambert-St Louis
Tue 9/22
2:30 pm-8:07 pm
1 stop7h 37m
$572
FlagstaffSt. Louis
FLG Flagstaff Pulliam - STL Lambert-St Louis
FLGSTL
Flagstaff Pulliam
Thu 10/1
11:43 am-9:48 pm
1 stop8h 05m
Lambert-St Louis
Tue 10/6
6:32 am-12:05 pm
1 stop7h 33m
$572
FlagstaffSt. Louis
FLG Flagstaff Pulliam - STL Lambert-St Louis
FLGSTL
Flagstaff Pulliam
Fri 9/18
10:40 am-11:43 pm
2 stops11h 03m
Lambert-St Louis
Wed 9/23
7:00 am-3:00 pm
2 stops10h 00m
$674
Sorted by cheapest first
Compare providers for flights from Flagstaff to St. Louis
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Flagstaff to St. Louis in September.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Flagstaff-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Flagstaff-St. Louis flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Flagstaff-St. Louis flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Flagstaff-St. Louis flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Flagstaff-St. Louis flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from Flagstaff to St. Louis
Have a flexible travel schedule? Discover the best time to fly to St. Louis from Flagstaff with our price prediction graph.
FLG-STL
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Reviews of airlines servicing St. Louis
Get insights into the airlines that provide service to St. Louis. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to St. Louis. Reviews last updated September 8, 2026.
Get a feel of what it's like to fly with American Airlines from Flagstaff to St. Louis by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Entertainment
6.8
Crew
7.9
Boarding
7.5
Overall
7.1
Comfort
7.2
Food
6.4
Reviews
1 / 20
4.0
OkayAmanda,Sep 2023
PHX - OGG
Entertainment
6.8
Crew
7.9
Boarding
7.5
Overall
7.1
Comfort
7.2
Food
6.4
Reviews
1 / 20
4.0
OkayAmanda,Sep 2023
PHX - OGG
Related info for your journey
Find useful and relevant information for your journey from Flagstaff to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near St. Louis?
Book flights to St. Louis if you plan to visit one of these locationsFairview Heights
O'Fallon
Fenton
Swansea
Eureka
Maryland Heights
Collinsville
Wentzville
Edwardsville
Glencoe
Chesterfield
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes
Complete your trip
Flights by cabin class
Other flight options
Popular flights
St. Louis flight routes
Alternative routes for Flagstaff to St. Louis
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to St. Louis by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Flagstaff to St. Louis by cabin class
Find flights from Flagstaff to St. Louis, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Flagstaff and St. Louis flights
Browse other Flagstaff and St. Louis flight options. Last updated on September 8, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Other flights to St. Louis
Explore flights to St. Louis departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on September 8, 2026.
Top airline flying from Flagstaff to St. Louis
Discover the top airline that operate flights from Flagstaff to St. Louis. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated September 8, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$365 | Average$559 | FlexibilityNo cancel fee | On-time71% |