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$41+ Cheap flights from St. Louis (STL) to Phoenix

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 2/22. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PHX
Feb 4 — Feb 111
Tue 2/4
Tue 2/11
1 adult, Economy
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The best prices from Lambert-St Louis to Phoenix are usually found in May or July, booked 83 days in advance, depart on a Wednesday or Saturday and return on a Wednesday

Cheap flight deals from St. Louis to Phoenix

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Phoenix (PH1). 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 January 30, 2025.

Round-trip from

$280
(Frontier)

One-way from

$41
(Trip.com)

Popular in

March

Cheapest in

May

Average price

$359
From Lambert-St Louis to Phoenix
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One-way flight from Lambert-St Louis to Phoenix
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Highest demand for flights based on searches. 18% potential increase in price ($73 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($12 potential savings vs. average RT price).
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Average for round-trip flights in January 2025
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Find flight deals from St. Louis to Phoenix

Cheapest flights from St. Louis to Phoenix
Explore the most affordable flight options available from St. Louis to Phoenix. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 30, 2025.

This Frontier deal was found by Cheapflights users on 1/29. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/68:31 pmSTL - PHX
1 stop12h 46mFrontier
Fri 2/710:15 pmPHX - STL
1 stop10h 01mFrontier
Deal found 1/29$280
This Expedia deal was found by Cheapflights users on 1/29. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/311:08 pmSTL - PHX
1 stop9h 39mMultiple Airlines
Wed 3/511:47 amPHX - STL
2 stops11h 12mMultiple Airlines
Deal found 1/29$282
This Mytrip deal was found by Cheapflights users on 1/29. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/65:38 pmSTL - PHX
2 stops26h 29mSpirit Airlines
Mon 3/107:02 pmPHX - STL
2 stops19h 40mSpirit Airlines
Deal found 1/29$324
This American Airlines deal was found by Cheapflights users on 1/30. 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 2/157:15 amSTL - PHX
Nonstop3h 44mAmerican Airlines
Sat 2/227:52 pmPHX - STL
Nonstop2h 47mAmerican Airlines
Deal found 1/30$359
This Southwest deal was found by Cheapflights users on 1/29. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/67:20 pmSTL - PHX
1 stop6h 00mSouthwest
Thu 3/137:50 pmPHX - STL
Nonstop2h 50mSouthwest
Deal found 1/29$365
This KAYAK deal was found by Cheapflights users on 1/30. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/245:30 pmSTL - PHX
1 stop7h 58mDelta
Thu 2/276:30 amPHX - STL
1 stop5h 48mDelta
Deal found 1/30$372
This Alaska Airlines deal was found by Cheapflights users on 1/29. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/86:44 amSTL - PHX
1 stop19h 28mAlaska Airlines
Tue 4/159:08 pmPHX - STL
2 stops24h 51mAlaska Airlines
Deal found 1/29$385
This United Airlines deal was found by Cheapflights users on 1/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/141:41 pmSTL - PHX
2 stops9h 21mUnited Airlines
Tue 5/206:00 amPHX - STL
1 stop13h 01mUnited Airlines
Deal found 1/30$444

Find flights from St. Louis to Phoenix within your budget

Customize your flight search to find flights from St. Louis to Phoenix 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 2,558,603 searches. Data last updated January 30, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Fri 2/28

7:09 pm-12:59 am

1 stop6h 50m

Phoenix Sky Harbor Intl

Sun 3/2

8:52 am-10:08 pm

1 stop12h 16m

$280

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Mon 3/3

11:08 pm-7:47 am

1 stop9h 39m

Phoenix Sky Harbor Intl

Wed 3/5

11:47 am-11:59 pm

2 stops11h 12m

$282

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Thu 3/6

5:38 pm-7:07 pm

2 stops26h 29m

Phoenix Sky Harbor Intl

Mon 3/10

7:02 pm-4:42 pm

2 stops19h 40m

$324

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Mon 2/24

6:00 am-8:40 am

Nonstop3h 40m

Phoenix Sky Harbor Intl

Thu 2/27

8:55 pm-12:45 am

Nonstop2h 50m

$356

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sat 2/15

7:15 am-9:59 am

Nonstop3h 44m

Phoenix Sky Harbor Intl

Wed 2/19

7:52 pm-11:39 pm

Nonstop2h 47m

$359

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Mon 2/24

5:30 pm-12:28 am

1 stop7h 58m

Phoenix Sky Harbor Intl

Thu 2/27

6:30 am-1:18 pm

1 stop5h 48m

$372

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Tue 4/8

6:44 am-12:12 am

1 stop19h 28m

Phoenix Sky Harbor Intl

Tue 4/15

9:08 pm-11:59 pm

2 stops24h 51m

$385

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 3/5

1:39 pm-10:59 pm

1 stop10h 20m

Phoenix Sky Harbor Intl

Mon 3/10

11:59 pm-12:12 pm

2 stops10h 13m

$431

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sat 2/22

7:04 pm-12:59 am

1 stop6h 55m

$41

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Tue 3/4

4:00 pm-7:07 pm

3 stops28h 07m

$102

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/28

Showing 1-10 of 17 results
1
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Best time to book a flight from St. Louis to Phoenix

Have a flexible travel schedule? Discover the best time to fly to Phoenix 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.

Travel insights for flights from St. Louis to Phoenix

Get recent, data-driven insights about flights from St. Louis to Phoenix including ideal travel times, pricing trends, and more.

How far ahead should I book a flight from St. Louis to Phoenix?

Use this chart to determine the optimal time to book a round-trip flight from St. Louis to Phoenix. Price data was last updated on January 24, 2025.

The best time to book flights from St. Louis to Phoenix is 83 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, January is the cheapest month in which you can book a flight from St. Louis to Phoenix (average of $258). Flying from St. Louis to Phoenix in March is currently the most expensive (average of $337). 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.

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

Find hourly flight availability from St. Louis to Phoenix. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated January 30, 2025.

When flying from St. Louis to Phoenix, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 60% versus a flight in the morning.

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

Use this chart to determine the cheapest time to fly round-trip from St. Louis to Phoenix. Price data was last updated on December 16, 2024.

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

Weekly flight availability from St. Louis to Phoenix

Explore weekly flight availability from St. Louis to Phoenix. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated January 30, 2025.

The most flights from STL to PH1 are scheduled on a Tuesday (12 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (4 on average).

Rainfall in Phoenix by month

Plan your trip to Phoenix by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Phoenix ranges from 0.0 - 1.1 inches per month. July is typically the wettest month, when rainfall can reach 1.1 in. June is typically the driest time to visit Phoenix when rainfall is around 0.0 in.

Temperature in Phoenix by month

Plan your trip to Phoenix by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Phoenix, 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 95.0 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 55.4 F).

Reviews of airlines servicing Phoenix

Get insights into the airlines that provide service to Phoenix. 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 Phoenix. Reviews last updated January 30, 2025.
To help decide which airline to fly from St. Louis to Phoenix, see what other customers have to say about Southwest, Alaska Airlines and Delta. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,585 reviews

Overall

8.1

Crew

8.7

Boarding

8.2

Entertainment

7.7

Food

7.1

Comfort

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Southwest
8.1
Very good
4,585 reviews
Southwest
8.1
Very good
4,585 reviews

Overall

8.1

Crew

8.7

Boarding

8.2

Entertainment

7.7

Food

7.1

Comfort

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Alaska Airlines
8.0
Very good
9,686 reviews
Southwest
8.1
Very good
4,585 reviews

Overall

8.1

Crew

8.7

Boarding

8.2

Entertainment

7.7

Food

7.1

Comfort

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Delta
8.0
Very good
8,450 reviews
Southwest
8.1
Very good
4,585 reviews

Overall

8.1

Crew

8.7

Boarding

8.2

Entertainment

7.7

Food

7.1

Comfort

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

United Airlines
7.4
Good
8,906 reviews
Southwest
8.1
Very good
4,585 reviews

Overall

8.1

Crew

8.7

Boarding

8.2

Entertainment

7.7

Food

7.1

Comfort

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,585 reviews

Overall

8.1

Crew

8.7

Boarding

8.2

Entertainment

7.7

Food

7.1

Comfort

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Phoenix. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from St. Louis to Phoenix?

    Located just 12.7 mi from the city center, Lambert-St Louis is the airport most travelers will use when flying to Phoenix from St. Louis. Booking flights from Lambert-St Louis (STL) to Phoenix should be relatively easy as there are 9 daily outbound flights to Phoenix from 5 different airlines.

  • What are the cheapest airlines flying from St. Louis to Phoenix round-trip?

    Currently priced at $280, Frontier will fly you from St. Louis to Phoenix and back. In addition to Frontier, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Spirit Airlines and Southwest - these airlines can fly you to your destination from $324 and $356, respectively. These flights start at 12% lower than the current average price 3 months from now.

  • What are the cheapest airlines to fly from St. Louis to Phoenix one-way?

    For one-way options, check prices for Frontier. According to our data, you can fly for as low as $41. Users have also found prices from $102 and $180 on Spirit Airlines and American Airlines, respectively.

  • What are the most reliable airlines from St. Louis to Phoenix?

    No one likes to see their flight delayed. When booking a flight from St. Louis to Phoenix consider choosing SkyWest Airlines (83%), Southwest (80%) or Alaska Airlines (79%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from St. Louis to Phoenix?

    While on average a flight from St. Louis to Phoenix is generally $404, our data shows the cheapest flight currently is $123. When looking at the most popular route, (Lambert-St Louis - Phoenix Sky Harbor Intl), you can expect to pay $172 for that flight.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from St. Louis to Phoenix 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 Phoenix?

    Currently, January is the cheapest month in which you can book a flight from St. Louis to Phoenix (average of $258). Flying from St. Louis to Phoenix in March is currently the most expensive (average of $337). 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.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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Top 5 airlines flying from St. Louis to Phoenix

Discover the top 5 airlines that operate flights from St. Louis to Phoenix. 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 2,558,603 searches. Data last updated January 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$78Average$151FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$140Average$364FlexibilityNo cancel feeOn-time71%
DeltaCheapest$197Average$286FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$226Average$469FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$277Average$445FlexibilityNo cancel feeOn-time63%
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