$390+ Cheap flights from St. Louis to Flagstaff (STL - FLG)
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 9/22. Fares are subject to change and may not be available on all flights or dates of travel.
STL — FLG
Oct 9 — Oct 161
Round-trip
1 adult, Economy
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Find cheap flights from St. Louis to Flagstaff 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 St. Louis to Flagstaff
Cheapest
Best
Last-minute
One-way
Cheapest flights from St. Louis to FlagstaffExplore the most affordable flight options available from St. Louis to Flagstaff. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 9, 2026.
Explore the most affordable flight options available from St. Louis to Flagstaff. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 9, 2026.
This American Airlines deal was found by Cheapflights users on 9/5. 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.
Sat 10/172:31 pm -
1 stop8h 08m
Sat 10/2411:52 am -
1 stop6h 51m
Deal found 9/5![American Airlines logo]()
$484
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.
Sat 10/172:31 pm -
1 stop8h 08m
Thu 10/2212:45 pm -
1 stop7h 14m
Deal found 9/7![American Airlines logo]()
$522
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.
Tue 10/62:31 pm -
1 stop8h 08m
Tue 10/1310:34 am -
2 stops11h 08m
Deal found 9/8![American Airlines logo]()
$561
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 9/188:00 am -
1 stop5h 13m
Tue 9/2211:43 am -
1 stop7h 09m
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.
Fri 9/258:00 am -
1 stop5h 13m
Fri 10/26:49 am -
1 stop4h 55m
Deal found 9/7![American Airlines logo]()
$592
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 12/172:45 pm -
1 stop6h 34m
Sun 12/201:17 pm -
1 stop5h 24m
Deal found 9/6![American Airlines logo]()
$611
Best flights from St. Louis to FlagstaffDiscover carefully curated flight deals from St. Louis to Flagstaff that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 9, 2026.
Discover carefully curated flight deals from St. Louis to Flagstaff that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 9, 2026.
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.
Sat 10/172:31 pm -
1 stop8h 08m
Sat 10/2411:52 am -
1 stop6h 51m
Deal found 9/8![American Airlines logo]()
$484
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.
Sat 11/75:00 am -
1 stop8h 50m
Sat 11/147:37 am -
1 stop5h 06m
Deal found 9/7![American Airlines logo]()
$484
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.
Sat 10/172:31 pm -
1 stop8h 08m
Thu 10/2212:45 pm -
1 stop7h 14m
Deal found 9/7![American Airlines logo]()
$522
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.
Tue 10/62:31 pm -
1 stop8h 08m
Tue 10/1310:34 am -
2 stops11h 08m
Deal found 9/8![American Airlines logo]()
$561
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 9/258:00 am -
1 stop5h 13m
Fri 10/26:49 am -
1 stop4h 55m
Deal found 9/7![American Airlines logo]()
$592
Last-minute flights from St. Louis to FlagstaffDiscover last-minute flight deals from St. Louis to Flagstaff. Data last updated September 9, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Flagstaff. Data last updated September 9, 2026 and is based on user searches.
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 9/188:00 am -
1 stop5h 13m
Tue 9/2211:43 am -
1 stop7h 09m
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.
Fri 9/258:00 am -
1 stop5h 13m
Fri 10/26:49 am -
1 stop4h 55m
Deal found 9/7![American Airlines logo]()
$592
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.
Tue 10/62:31 pm -
1 stop8h 08m
Tue 10/1310:34 am -
2 stops11h 08m
Deal found 9/8![American Airlines logo]()
$561
This American Airlines deal was found by Cheapflights users on 9/5. 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.
Sat 10/172:31 pm -
1 stop8h 08m
Sat 10/2411:52 am -
1 stop6h 51m
Deal found 9/5![American Airlines logo]()
$484
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.
Sat 10/172:31 pm -
1 stop8h 08m
Thu 10/2212:45 pm -
1 stop7h 14m
Deal found 9/7![American Airlines logo]()
$522
One-way flights from St. Louis to FlagstaffSearch for one-way flight options from St. Louis to Flagstaff. Find affordable one-way fares based on user searches. Data last updated September 9, 2026.
Search for one-way flight options from St. Louis to Flagstaff. Find affordable one-way fares based on user searches. Data last updated September 9, 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.
Tue 9/227:00 am -
1 stop6h 53m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/7![American Airlines logo]()
$390
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.
Sun 11/16:00 am -
1 stop7h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/4![American Airlines logo]()
$412
Find flight deals from St. Louis to Flagstaff
Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Flagstaff (FLG). 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 9, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $484 (American Airlines) |
One-way from | $390 (American Airlines) |
Popular in | December |
Cheapest in | October |
Average price | $601 |
Cheapflights Fare Finder
Customize your flight search to find flights from St. Louis to Flagstaff 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 9, 2026.
Use the filters below to find and compare flights from St. Louis to Flagstaff that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Quickest round-trip
St. LouisFlagstaff
STL Lambert-St Louis - FLG Flagstaff Pulliam
STLFLG
Lambert-St Louis
Tue 9/22
7:00 am-11:53 am
1 stop6h 53m
Flagstaff Pulliam
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$390
St. LouisFlagstaff
STL Lambert-St Louis - FLG Flagstaff Pulliam
STLFLG
Lambert-St Louis
Sun 11/1
6:00 am-12:50 pm
1 stop7h 50m
Flagstaff Pulliam
Wed 12/31
12:00 am-1:00 am
Nonstop0h 00m
$412
St. LouisFlagstaff
STL Lambert-St Louis - FLG Flagstaff Pulliam
STLFLG
Lambert-St Louis
Sat 10/17
2:31 pm-8:39 pm
1 stop8h 08m
Flagstaff Pulliam
Sat 10/24
11:52 am-8:43 pm
1 stop6h 51m
$484
St. LouisFlagstaff
STL Lambert-St Louis - FLG Flagstaff Pulliam
STLFLG
Lambert-St Louis
Sat 11/7
5:00 am-12:50 pm
1 stop8h 50m
Flagstaff Pulliam
Sat 11/14
7:37 am-1:43 pm
1 stop5h 06m
$484
St. LouisFlagstaff
STL Lambert-St Louis - FLG Flagstaff Pulliam
STLFLG
Lambert-St Louis
Sat 10/17
2:31 pm-8:39 pm
1 stop8h 08m
Flagstaff Pulliam
Thu 10/22
12:45 pm-9:59 pm
1 stop7h 14m
$522
St. LouisFlagstaff
STL Lambert-St Louis - FLG Flagstaff Pulliam
STLFLG
Lambert-St Louis
Tue 10/6
2:31 pm-8:39 pm
1 stop8h 08m
Flagstaff Pulliam
Tue 10/13
10:34 am-11:42 pm
2 stops11h 08m
$561
St. LouisFlagstaff
STL Lambert-St Louis - FLG Flagstaff Pulliam
STLFLG
Lambert-St Louis
Fri 9/25
8:00 am-11:13 am
1 stop5h 13m
Flagstaff Pulliam
Fri 10/2
6:49 am-1:44 pm
1 stop4h 55m
$592
Sorted by cheapest first
Compare providers for flights from St. Louis to Flagstaff
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 St. Louis to Flagstaff 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 St. Louis-Flagstaff flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Flagstaff flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-Flagstaff flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on St. Louis-Flagstaff 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 St. Louis-Flagstaff 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 St. Louis to Flagstaff
Have a flexible travel schedule? Discover the best time to fly to Flagstaff from St. Louis with our price prediction graph.
STL-FLG
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.
Cheapflights Insights
Everything you need to know about your flight from St. Louis to Flagstaff
What is the cheapest month to book a flight from St. Louis to Flagstaff?
Currently, October is the cheapest month in which you can book a flight from St. Louis to Flagstaff (average of $473). Flying from St. Louis to Flagstaff in December is currently the most expensive (average of $791). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
How much does it cost to fly round-trip from St. Louis to Flagstaff?
Airfare is below average for this route at the moment.
St. Louis to Flagstaff flights typically cost between $485 and $680 in October.The cheapest round-trip price found within the last 5 days was $484 on American Airlines (Oct 17-Oct 24).
Reviews of airlines servicing Flagstaff
Get insights into the airlines that provide service to Flagstaff. 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 Flagstaff. Reviews last updated September 9, 2026.
Read through reviews of airlines operating flights from St. Louis to Flagstaff, such as American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Boarding
7.5
Comfort
7.2
Crew
7.9
Food
6.4
Entertainment
6.8
Overall
7.1
Reviews
1 / 20
6.0
GoodKristin,Jul 2026
DCA - PHX
Boarding
7.5
Comfort
7.2
Crew
7.9
Food
6.4
Entertainment
6.8
Overall
7.1
Reviews
1 / 20
6.0
GoodKristin,Jul 2026
DCA - PHX
Related info for your journey
Find useful and relevant information for your journey from St. Louis to Flagstaff. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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St. Louis and Flagstaff flights
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Top airline flying from St. Louis to Flagstaff
Discover the top airline that operate flights from St. Louis to Flagstaff. 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 9, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$355 | Average$565 | FlexibilityNo cancel fee | On-time71% |