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$54+ Cheap flights from Phoenix to St. Louis (STL)

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 1/9. Fares are subject to change and may not be available on all flights or dates of travel.
PHX — STL
Dec 23 — Dec 301
Mon 12/23
Mon 12/30
1 adult, Economy
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The best prices from Phoenix to Lambert-St Louis are usually found in June or July, booked 63 days in advance, depart on a Wednesday or Friday and return on a Tuesday

Cheap flight deals from Phoenix to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Phoenix (PH1) 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 December 18, 2024.

Round-trip from

$244
(Frontier)

One-way from

$54
(Frontier)

Popular in

December

Cheapest in

June

Average price

$460
From Phoenix to Lambert-St Louis
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One-way flight from Phoenix to Lambert-St Louis
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High demand for flights, 22% potential price rise
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Best time to find cheap flights, 4% potential price drop
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Average for round-trip flights in December 2024
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Find flight deals from Phoenix to St. Louis

Cheapest flights from Phoenix to St. Louis
Explore the most affordable flight options available from Phoenix to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 18, 2024.

This Frontier deal was found by Cheapflights users on 12/17. 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 12/269:00 pmPHX - STL
1 stop10h 13mFrontier
Mon 12/306:49 pmSTL - PHX
1 stop6h 50mFrontier
Deal found 12/17$268
This United Airlines deal was found by Cheapflights users on 12/16. 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.
Mon 12/2312:59 amPHX - STL
1 stop8h 48mUnited Airlines
Wed 12/258:30 amSTL - PHX
1 stop8h 53mUnited Airlines
Deal found 12/16$508
This American Airlines deal was found by Cheapflights users on 12/18. 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 12/259:43 amPHX - STL
Nonstop3h 10mAmerican Airlines
Sun 12/297:24 amSTL - PHX
Nonstop3h 31mAmerican Airlines
Deal found 12/18$623
This Mytrip deal was found by Cheapflights users on 12/16. 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.
Wed 12/251:19 amPHX - STL
3 stops14h 06mMultiple Airlines
Mon 12/309:50 amSTL - PHX
3 stops24h 12mMultiple Airlines
Deal found 12/16$643
This Southwest deal was found by Cheapflights users on 12/16. 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.
Wed 12/251:30 pmPHX - STL
Nonstop2h 55mSouthwest
Sat 12/289:00 pmSTL - PHX
Nonstop3h 25mSouthwest
Deal found 12/16$644
This Delta deal was found by Cheapflights users on 12/16. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/216:35 amPHX - STL
1 stop5h 45mDelta
Tue 12/246:04 amSTL - PHX
1 stop8h 27mDelta
Deal found 12/16$682
This Alaska Airlines deal was found by Cheapflights users on 12/17. 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.
Sun 12/298:20 pmPHX - STL
1 stop16h 07mAlaska Airlines
Fri 1/37:00 amSTL - PHX
2 stops11h 19mAlaska Airlines
Deal found 12/17$869

Find flights from Phoenix to St. Louis within your budget

Customize your flight search to find flights from Phoenix 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 2,558,603 searches. Data last updated December 18, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Thu 1/16

9:51 pm-9:16 am

1 stop10h 25m

Lambert-St Louis

Thu 1/23

8:31 pm-8:17 am

1 stop12h 46m

$244

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Fri 1/24

10:15 pm-9:16 am

1 stop10h 01m

Lambert-St Louis

Tue 1/28

2:49 pm-11:59 pm

1 stop10h 10m

$267

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Wed 1/15

9:30 am-1:42 pm

Nonstop3h 12m

Lambert-St Louis

Wed 1/22

2:27 pm-4:52 pm

Nonstop3h 25m

$277

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Wed 1/15

2:34 pm-9:33 pm

1 stop5h 59m

Lambert-St Louis

Wed 1/22

6:00 am-1:55 pm

1 stop8h 55m

$296

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Fri 1/24

6:55 am-10:45 am

Nonstop2h 50m

Lambert-St Louis

Tue 1/28

11:10 am-3:10 pm

1 stop5h 00m

$304

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Wed 1/15

5:40 pm-1:53 pm

2 stops19h 13m

Lambert-St Louis

Wed 1/22

2:49 pm-10:43 pm

1 stop8h 54m

$321

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Sat 1/11

7:00 am-3:38 pm

2 stops7h 38m

Lambert-St Louis

Sat 1/18

6:50 am-3:31 pm

1 stop9h 41m

$423

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Thu 1/9

1:11 pm-7:34 pm

1 stop5h 23m

$54

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Mon 1/27

11:56 am-2:43 pm

2 stops25h 47m

$125

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Tue 2/18

7:05 pm-10:55 pm

Nonstop2h 50m

$139

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/18

Showing 1-10 of 15 results
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Best time to book a flight from Phoenix to St. Louis

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

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

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

Use this chart to determine the optimal time to book a round-trip flight from Phoenix to St. Louis. Price data was last updated on December 13, 2024.

To ensure you get the cheapest price possible for a flight from Phoenix to St. Louis, you should look to book at least 63 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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

Currently, August is the cheapest month in which you can book a flight from Phoenix to St. Louis (average of $311). Flying from Phoenix to St. Louis in March is currently the most expensive (average of $356). 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 PHX to STL?

Find hourly flight availability from Phoenix to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 18, 2024.

A simple way to save on the total cost of your ticket is to fly from Phoenix to St. Louis in the afternoon. If you’re flexible enough to do this you can expect to save up to 41% on your trip compared to booking a flight at noon.

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

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

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

Rainfall in St. Louis by month

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

In terms of precipitation, rainfall in St. Louis ranges from 2.2 - 4.7 inches per month. May is typically the wettest month, when rainfall can reach 4.7 in. February is typically the driest time to visit St. Louis when rainfall is around 2.2 in.

Temperature in St. Louis by month

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

If weather is an important factor for your trip to St. Louis, 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 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

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 December 18, 2024.
To help decide which airline to fly from Phoenix to St. Louis, see what other customers have to say about Frontier, American 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
4,848 reviews

Comfort

8.1

Entertainment

7.7

Overall

8.1

Boarding

8.2

Crew

8.7

Food

7.2

Reviews

1 / 10

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
4,848 reviews
Southwest
8.1
Very good
4,848 reviews

Comfort

8.1

Entertainment

7.7

Overall

8.1

Boarding

8.2

Crew

8.7

Food

7.2

Reviews

1 / 10

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
9,552 reviews
Southwest
8.1
Very good
4,848 reviews

Comfort

8.1

Entertainment

7.7

Overall

8.1

Boarding

8.2

Crew

8.7

Food

7.2

Reviews

1 / 10

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
8,604 reviews
Southwest
8.1
Very good
4,848 reviews

Comfort

8.1

Entertainment

7.7

Overall

8.1

Boarding

8.2

Crew

8.7

Food

7.2

Reviews

1 / 10

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
9,059 reviews
Southwest
8.1
Very good
4,848 reviews

Comfort

8.1

Entertainment

7.7

Overall

8.1

Boarding

8.2

Crew

8.7

Food

7.2

Reviews

1 / 10

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
4,848 reviews

Comfort

8.1

Entertainment

7.7

Overall

8.1

Boarding

8.2

Crew

8.7

Food

7.2

Reviews

1 / 10

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 Phoenix to St. Louis. 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 into for flights to St. Louis from Phoenix?

    For a flight from Phoenix to St. Louis, you will be flying into Lambert-St Louis. Lambert-St Louis (STL) is just 12.7 mi from the center of the city. Lambert-St Louis is the only St. Louis airport and it handles 4 inbound flights from Phoenix per day. 5 airlines have flights to Lambert-St Louis from Phoenix on a regular basis.

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

    According to our current data, Frontier ($244), American Airlines ($277), and Delta ($296) offers the cheapest pricing from Phoenix to St. Louis. Users have found that Frontier is 24% cheaper than the other options available to this destination.

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

    For one-way options, check prices for Frontier. According to our data, you can fly for as low as $54. Users have also found prices from $125 and $139 on Spirit Airlines and Southwest, respectively.

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

    Before booking your flight to St. Louis from Phoenix, check out the most reliable airlines to get you to your destination on time: Envoy Air (100%), Southwest (89%), Alaska Airlines( 88%).

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

    On average you can expect to pay $378 for a flight from Phoenix to St. Louis. The cheapest flight overall is $163 while the most popular route, (Phoenix Sky Harbor Intl - Lambert-St Louis) is currently priced at $208.

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

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

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

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

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

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

    Currently, August is the cheapest month in which you can book a flight from Phoenix to St. Louis (average of $311). Flying from Phoenix to St. Louis in March is currently the most expensive (average of $356). 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

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Top 5 airlines flying from Phoenix to St. Louis

Discover the top 5 airlines that operate flights from Phoenix 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 2,558,603 searches. Data last updated December 18, 2024.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$78Average$151FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$131Average$341FlexibilityNo cancel feeOn-time71%
DeltaCheapest$216Average$296FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$273Average$412FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$278Average$422FlexibilityNo cancel feeOn-time63%
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