What is the cheapest airline to fly from St. Louis to Flagstaff round-trip?

Our cheapest airline available from St. Louis to Flagstaff is American Airlines. Our recent data shows that you can find tickets from as low as $386 on this airline. Users have found that American Airlines is 36% cheaper than the other options available to this destination.

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

Travelers seeking maximum savings on their St. Louis to Flagstaff flight should consider departing on Saturday mornings when fares are most often at their lowest. Monday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

In terms of precipitation, rainfall in Flagstaff ranges from 0.4 - 2.7 inches per month. August is typically the wettest month, when rainfall can reach 2.7 in. June is typically the driest time to visit Flagstaff when rainfall is around 0.4 in.

If weather is an important factor for your trip to Flagstaff, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 71.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

What is the cheapest day to fly round-trip from St. Louis to Flagstaff?

Users have found that flying from St. Louis to Flagstaff on a Tuesday typically leans towards higher prices. However, this doesn’t mean you still can’t find a deal. Flexibility with other aspects of your flight can still land a great price for your trip.

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

September can be a great time to fly to Flagstaff from St. Louis with a flight ticket averaging about $612. Cheapflights users have found deals in the month of September for as cheap as $413. The most expensive prices can be found in the month of January.

What is the cheapest time of day to fly from STL to FLG?

It’s typically best to fly out from St. Louis to Flagstaff in the morning. Doing so could potentially save you 5% on the flight price compared to flying at noon, which is usually more expensive.

Can I find deals for flights from St. Louis to Flagstaff that include hotel bookings?

Yes. In addition to deals on St. Louis to Flagstaff flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from St. Louis to Flagstaff?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Flagstaff.

Can I find deals for business class flights from St. Louis to Flagstaff?

Yes. Cheapflights offers flight deals from St. Louis to Flagstaff by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$250+ Flights from St. Louis to Flagstaff

Q: 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 $450 and $670 in October. The cheapest round-trip price found within the last 3 days was $386 on American Airlines (Oct 18-Oct 21).

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Cheap flight deals from St. Louis to Flagstaff

Round-trip from	$386 (American Airlines)
One-way from	$250 (American Airlines)
Popular in	January
Cheapest in	September
Average price	$555

From Lambert-St Louis to Flagstaff Pulliam

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One-way flight from Lambert-St Louis to Flagstaff Pulliam

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Highest demand for flights based on searches. 12% potential increase in price ($88 potential increase over avg. RT price).

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Cheapest flight prices on average. 3% potential price decrease ($18 potential savings vs. average RT price).

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Average for round-trip flights in July 2025

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Find flight deals from St. Louis to Flagstaff

Cheapest flights from St. Louis to Flagstaff
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 July 29, 2025.

Sat 10/185:20 amSTL - FLG

1 stop7h 27mAmerican Airlines

Tue 10/2111:20 amFLG - STL

1 stop7h 33mAmerican Airlines

Deal found 7/27

$386

Best flights from St. Louis to Flagstaff
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 July 29, 2025.

Sat 10/185:20 amSTL - FLG

1 stop7h 27mAmerican Airlines

Tue 10/2111:20 amFLG - STL

1 stop7h 33mAmerican Airlines

Deal found 7/27

$386

Last-minute flights from St. Louis to Flagstaff
Discover last-minute flight deals from St. Louis to Flagstaff. Data last updated July 29, 2025 and is based on user searches.

Thu 8/76:14 pmSTL - FLG

1 stop6h 38mAmerican Airlines

Sun 8/108:15 amFLG - STL

1 stop7h 15mAmerican Airlines

Deal found 7/28

$656

Thu 8/146:14 pmSTL - FLG

1 stop6h 38mAmerican Airlines

Mon 8/1810:30 amFLG - STL

2 stops10h 35mAmerican Airlines

Deal found 7/27

$476

One-way flights from St. Louis to Flagstaff
Search for one-way flight options from St. Louis to Flagstaff. Find affordable one-way fares based on user searches. Data last updated July 29, 2025.

Sun 10/127:31 amSTL - FLG

1 stop7h 17mAmerican Airlines

Deal found 7/27

$250

Fly from

Fly to

Route

Depart

Return

Price

St. LouisFlagstaff

STL - FLG

STLFLG

Lambert-St Louis

Sat 10/18

5:20 am-10:47 am

1 stop7h 27m

Flagstaff Pulliam

Tue 10/21

11:20 am-8:53 pm

1 stop7h 33m

$386

St. LouisFlagstaff

STL - FLG

STLFLG

Lambert-St Louis

Sun 10/12

7:31 am-12:48 pm

1 stop7h 17m

$250

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/27

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.

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, July is the cheapest month in which you can book a flight from St. Louis to Flagstaff (average of $548). Flying from St. Louis to Flagstaff in March is currently the most expensive (average of $660). 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?

Reviews of airlines servicing Flagstaff

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.

American Airlines

7.2

Good

10,000 reviews

Reviews

1 / 20

2.0

Mediocre

Andrew,May 2025

LAX - MIA

2 hour delay. Discovered an engine problem late, we boarded the plane and they asked us to come off. To add insult to injury nothing was given to passengers to make amends. No free drink. No extra food or snacks. No free WiFi. Gimme a break

American Airlines

7.2

Good

10,000 reviews

American Airlines

7.2

Good

10,000 reviews

Reviews

1 / 20

2.0

Mediocre

Andrew,May 2025

LAX - MIA

Related info for your journey

What is the cheapest airline to fly from St. Louis to Flagstaff round-trip?
Our cheapest airline available from St. Louis to Flagstaff is American Airlines. Our recent data shows that you can find tickets from as low as $386 on this airline. Users have found that American Airlines is 36% cheaper than the other options available to this destination.
Can I find deals for flights from St. Louis to Flagstaff that include hotel bookings?
Yes. In addition to deals on St. Louis to Flagstaff flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from St. Louis to Flagstaff?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Flagstaff.
Can I find deals for business class flights from St. Louis to Flagstaff?
Yes. Cheapflights offers flight deals from St. Louis to Flagstaff by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from St. Louis to Flagstaff?
Currently, July is the cheapest month in which you can book a flight from St. Louis to Flagstaff (average of $548). Flying from St. Louis to Flagstaff in March is currently the most expensive (average of $660). 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.

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Alternative routes for St. Louis to Flagstaff

Top airline flying from St. Louis to Flagstaff

Airline	Cheapest	Average	Flexibility	On-time
American Airlines	Cheapest$435	Average$633	FlexibilityNo cancel fee	On-time71%

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$250+ Cheap flights from St. Louis to Flagstaff (STL - FLG)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/12. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from St. Louis to Flagstaff with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from St. Louis to Flagstaff

Round-trip from

One-way from

Popular in

Cheapest in

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Find flight deals from St. Louis to Flagstaff

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 July 29, 2025.

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 July 29, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from St. Louis to Flagstaff that are best for you.

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.

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?

How much does it cost to fly round-trip from St. Louis to Flagstaff?

Reviews of airlines servicing Flagstaff

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.

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.

What is the cheapest airline to fly from St. Louis to Flagstaff round-trip?

Can I find deals for flights from St. Louis to Flagstaff that include hotel bookings?

How can I find direct flights from St. Louis to Flagstaff?

Can I find deals for business class flights from St. Louis to Flagstaff?

What is the cheapest month to book a flight from St. Louis to Flagstaff?

Traveling to a place near Flagstaff?

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Alternative routes for St. Louis to Flagstaff

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Top airline flying from St. Louis to Flagstaff

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Cheapest flights from St. Louis to Flagstaff
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 July 29, 2025.