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Cheap flights from St. Louis to Phoenix from $49

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Phoenix departing on 10/27. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Cheap round-trip flights

Enter your travel dates to find the best prices.
Southwest Logo
8:45 pm - 10:05 pmSTL-PHX
3h 20mnonstop
Southwest Logo
6:30 pm - 10:20 pmPHX-STL
2h 50mnonstop
$149Southwest
Find Deal
Tue, Oct 28 - Tue, Nov 4
Frontier Logo
9:59 pm - 11:41 pmSTL-PHX
27h 42m1 stop
Frontier Logo
5:45 am - 9:04 pmPHX-STL
13h 19m1 stop
$152Frontier
Find Deal
Fri, Oct 17 - Mon, Oct 20
Frontier Logo
7:52 pm - 6:21 pmSTL-PHX
24h 29m1 stop
Frontier Logo
5:15 pm - 10:14 pmPHX-STL
2h 59mnonstop
$153Frontier
Find Deal
Tue, Oct 14 - Fri, Oct 17
Frontier Logo
9:59 pm - 11:41 pmSTL-PHX
27h 42m1 stop
Frontier Logo
8:03 pm - 9:04 pmPHX-STL
23h 01m1 stop
$154Frontier
Find Deal
Fri, Oct 17 - Sun, Oct 19
Frontier Logo
10:59 pm - 12:21 amSTL-PHX
3h 22mnonstop
Frontier Logo
8:03 pm - 9:04 pmPHX-STL
23h 01m1 stop
$155Frontier
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Fri, Oct 17 - Sun, Oct 19
Southwest Logo
6:15 am - 7:35 amSTL-PHX
3h 20mnonstop
Southwest Logo
5:10 am - 10:00 amPHX-STL
2h 50mnonstop
$159Southwest
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Tue, Oct 21 - Wed, Oct 22
American Airlines Logo
2:29 pm - 5:05 pmSTL-PHX
3h 36mnonstop
American Airlines Logo
8:02 pm - 11:56 pmPHX-STL
2h 54mnonstop
$174American Airlines
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Tue, Nov 18 - Thu, Dec 4
American Airlines Logo
7:00 am - 8:34 amSTL-PHX
3h 34mnonstop
American Airlines Logo
3:25 pm - 8:27 pmPHX-STL
3h 02mnonstop
$184American Airlines
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Tue, Oct 14 - Tue, Oct 28
American Airlines Logo
7:31 am - 9:05 amSTL-PHX
3h 34mnonstop
American Airlines Logo
3:25 pm - 8:27 pmPHX-STL
3h 02mnonstop
$195American Airlines
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Wed, Oct 22 - Sat, Oct 25
American Airlines Logo
2:29 pm - 5:05 pmSTL-PHX
3h 36mnonstop
American Airlines Logo
7:55 pm - 11:51 pmPHX-STL
2h 56mnonstop
$199American Airlines
Find Deal
Fri, Nov 7 - Tue, Nov 11

American Airlines flights from St. Louis to Phoenix Sky Harbor Intl Airport

Our best American Airlines deals on St. Louis to Phoenix Sky Harbor Intl Airport flight tickets
American Airlines
Nov 18
STL2:29 pmLambert-St Louis
3h 36m
PHX5:05 pmPhoenix Sky Harbor Intl
Dec 4
PHX8:02 pmPhoenix Sky Harbor Intl
2h 54m
STL11:56 pmLambert-St Louis
$174
Find similar
American Airlines
Oct 14
STL7:00 amLambert-St Louis
3h 34m
PHX8:34 amPhoenix Sky Harbor Intl
Oct 28
PHX3:25 pmPhoenix Sky Harbor Intl
3h 02m
STL8:27 pmLambert-St Louis
$184
Find similar
American Airlines
Oct 22
STL7:31 amLambert-St Louis
3h 34m
PHX9:05 amPhoenix Sky Harbor Intl
Oct 25
PHX3:25 pmPhoenix Sky Harbor Intl
3h 02m
STL8:27 pmLambert-St Louis
$195
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Southwest flights from St. Louis to Phoenix Sky Harbor Intl Airport

Our best Southwest deals on St. Louis to Phoenix Sky Harbor Intl Airport flight tickets
Southwest
Oct 28
STL8:45 pmLambert-St Louis
3h 20m
PHX10:05 pmPhoenix Sky Harbor Intl
Nov 4
PHX6:30 pmPhoenix Sky Harbor Intl
2h 50m
STL10:20 pmLambert-St Louis
$149
Find similar
Southwest
Oct 21
STL6:15 amLambert-St Louis
3h 20m
PHX7:35 amPhoenix Sky Harbor Intl
Oct 22
PHX5:10 amPhoenix Sky Harbor Intl
2h 50m
STL10:00 amLambert-St Louis
$159
Find similar
Southwest
Nov 1
STL8:25 amLambert-St Louis
3h 20m
PHX9:45 amPhoenix Sky Harbor Intl
Nov 1
PHX12:05 pmPhoenix Sky Harbor Intl
2h 55m
STL5:00 pmLambert-St Louis
$209
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Phoenix Sky Harbor Intl Airport 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, momondo users made 832,500 searches. Data last updated October 1, 2025.
Use the filters below to find and compare flights from St. Louis to Phoenix Sky Harbor Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Tue 10/28

8:45 pm-10:05 pm

Nonstop3h 20m

Phoenix Sky Harbor Intl

Tue 11/4

6:30 pm-10:20 pm

Nonstop2h 50m

$149

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Fri 10/17

9:59 pm-11:41 pm

1 stop27h 42m

Phoenix Sky Harbor Intl

Mon 10/20

5:45 am-9:04 pm

1 stop13h 19m

$152

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Tue 10/14

7:52 pm-6:21 pm

1 stop24h 29m

Phoenix Sky Harbor Intl

Fri 10/17

5:15 pm-10:14 pm

Nonstop2h 59m

$153

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Fri 10/17

9:59 pm-11:41 pm

1 stop27h 42m

Phoenix Sky Harbor Intl

Sun 10/19

8:03 pm-9:04 pm

1 stop23h 01m

$154

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Fri 10/17

10:59 pm-12:21 am

Nonstop3h 22m

Phoenix Sky Harbor Intl

Sun 10/19

8:03 pm-9:04 pm

1 stop23h 01m

$155

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Tue 10/21

6:15 am-7:35 am

Nonstop3h 20m

Phoenix Sky Harbor Intl

Wed 10/22

5:10 am-10:00 am

Nonstop2h 50m

$159

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Tue 11/18

2:29 pm-5:05 pm

Nonstop3h 36m

Phoenix Sky Harbor Intl

Thu 12/4

8:02 pm-11:56 pm

Nonstop2h 54m

$174

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Tue 10/14

7:00 am-8:34 am

Nonstop3h 34m

Phoenix Sky Harbor Intl

Tue 10/28

3:25 pm-8:27 pm

Nonstop3h 02m

$184

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 10/22

7:31 am-9:05 am

Nonstop3h 34m

Phoenix Sky Harbor Intl

Sat 10/25

3:25 pm-8:27 pm

Nonstop3h 02m

$195

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Fri 11/7

2:29 pm-5:05 pm

Nonstop3h 36m

Phoenix Sky Harbor Intl

Tue 11/11

7:55 pm-11:51 pm

Nonstop2h 56m

$199

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Phoenix from

How to get the cheapest flight ticket from St. Louis to Phoenix Sky Harbor Intl Airport

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the typical price of a round-trip flight between St. Louis and Phoenix Sky Harbor Intl Airport?

What is the cheapest month to fly to Phoenix Sky Harbor Intl Airport?

In general, November is the cheapest month to fly from St. Louis to Phoenix Sky Harbor Intl Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $337. If you are unable to visit Phoenix Sky Harbor Intl Airport during the month of November, then departing from St. Louis during the month August is also very affordable. Most momondo users find prices during this month for around $344.

What is the cheapest day to depart on your flight to Phoenix Sky Harbor Intl Airport?

On average, the least expensive day to fly to Phoenix Sky Harbor Intl Airport from St. Louis is on a Wednesday. momondo users have found tickets for Wednesday departures for as low as $382. However, this price may fluctuate depending on the airline, the season, and holidays. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $484. These prices are subject to change though, so be sure to set up a Price Alert for flights to Phoenix Sky Harbor Intl Airport.

What is the cheapest time of day to depart on your flight to Phoenix Sky Harbor Intl Airport?

At noon is the cheapest time of day to fly from St. Louis to Phoenix Sky Harbor Intl Airport when you can find flight prices for as low as $385. Flying to Phoenix Sky Harbor Intl Airport at noon is an ideal time because this is during off-peak travel hours. Try not to purchase tickets in the morning because they tend to be around $448. Of course, these prices can vary depending on the time of year and what airport you fly to.

What is the cheapest Lambert-St Louis to Phoenix Sky Harbor Intl flight route?

Fly from Lambert-St Louis to Phoenix Sky Harbor Intl for the best Lambert-St Louis - Phoenix Sky Harbor Intl flight prices

How far in advance should I book a flight to Phoenix Sky Harbor Intl Airport?

You are more likely to see cheaper flights to Phoenix Sky Harbor Intl Airport from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Phoenix Sky Harbor Intl Airport for around $392 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Phoenix Sky Harbor Intl Airport from St. Louis for as low as $351 on momondo.

What cabin class options are available on Lambert-St Louis to Phoenix Sky Harbor Intl flights?

There are 3 cabin classes available to choose from on Lambert-St Louis to Phoenix Sky Harbor Intl flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on St. Louis to Phoenix Sky Harbor Intl Airport flights?

You could potentially save up to 28% on your flight if you consider stops on a St. Louis to Phoenix Sky Harbor Intl Airport flight.

How have St. Louis to Phoenix Sky Harbor Intl Airport flight prices changed over time?

As of October 2025, prices for St. Louis to Phoenix Sky Harbor Intl Airport flights are approximately 37% more expensive when compared to flights at the same time last year.

When to book flights from St. Louis to Phoenix Sky Harbor Intl Airport

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Phoenix Sky Harbor Intl Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to Phoenix Sky Harbor Intl Airport (STL to PHX) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Phoenix Sky Harbor Intl Airport

Best Price Found

$153

Fastest flight time

3h 20m

Direct flights

Every day
The best one-way flight to Phoenix Sky Harbor Intl Airport from St. Louis in the past 72 hours is $153. The best round-trip flight deal from St. Louis to Phoenix Sky Harbor Intl Airport found on momondo in the last 72 hours is $257.
The fastest flight from St. Louis to Phoenix Sky Harbor Intl Airport takes 3h 20m
Direct flights go from St. Louis to Phoenix Sky Harbor Intl Airport every day.
Search flight deals

  • How far is Lambert-St Louis to Phoenix Sky Harbor Intl by plane?

    Phoenix Sky Harbor Intl is 1265.4 mi away from Lambert-St Louis. Typically, this will take 3h 20m by plane in normal conditions.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Phoenix Sky Harbor Intl Airport?

    Prices for flights from Lambert-St Louis Airport to Phoenix Sky Harbor Intl Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Phoenix Sky Harbor Intl Airport?

  • How old do you have to be to fly from Lambert-St Louis Airport to Phoenix Sky Harbor Intl Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to Phoenix Sky Harbor Intl Airport.

  • What documentation or ID do you need to fly to Phoenix Sky Harbor Intl Airport?

    The travel and health documents you'll need for your trip to Phoenix Sky Harbor Intl Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Phoenix Sky Harbor Intl Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from St. Louis to Phoenix Sky Harbor Intl Airport?

  • What is the most popular airline from St. Louis to Phoenix Sky Harbor Intl Airport?

Best airlines flying from St. Louis to Phoenix Sky Harbor Intl Airport

Compare and see reviews for airlines that fly from St. Louis to Phoenix Sky Harbor Intl Airport with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $105Free CancellationRating
5.8
3,154 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $158Free CancellationRating
6.3
8,065 reviews
Search Spirit Airlines flights
DeltaPriceFrom $236Free CancellationRating
7.9
7,961 reviews
Search Delta flights
American AirlinesPriceFrom $247Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
SouthwestPriceFrom $263Free CancellationRating
8.0
4,248 reviews
Search Southwest flights
United AirlinesPriceFrom $294Free CancellationRating
7.4
8,929 reviews
Search United Airlines flights

  • Southwest Flights From St. Louis to Phoenix Sky Harbor Intl Airport

    Southwest operates around 12 flights from St. Louis to Phoenix Sky Harbor Intl Airport every week. The average price of these flights found in the last 72 hours has been $429, but momondo users have found Southwest deals from St. Louis to Phoenix Sky Harbor Intl Airport from as low as $263 round-trip. Southwest has been scored 8.0/10 in 4,248 reviews.

  • American Airlines Flights From St. Louis to Phoenix Sky Harbor Intl Airport

    American Airlines (7.2/10 from 10,000 reviews) operates around 2 flights from St. Louis to Phoenix Sky Harbor Intl Airport in any given week. The average American Airlines airfare for this route is around $408, with deals from around $247 rare but found on momondo. Referenced prices are for round-trip St. Louis to Phoenix Sky Harbor Intl Airport flight searches in the last 72 hours.

Traveling to a place near Phoenix?

Book flights to Phoenix if you plan to visit one of these locations
Scottsdale
Mesa
Tempe
Glendale
Chandler
Gilbert
Peoria
Surprise
Casa Grande
Buckeye
Goodyear
Apache Junction
Payson
Wickenburg
Avondale
Paradise Valley
Camp Verde
Fountain Hills
Cave Creek
Litchfield Park

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Phoenix?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from St. Louis to Phoenix. momondo saves you time and could save you money on your trip.

Can I find flights from St. Louis to Phoenix with flexible booking policies on momondo?

momondo does allow users to show only those flights to Phoenix from St. Louis which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from St. Louis to Phoenix?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Phoenix from St. Louis.

I’m not ready to book a flight from St. Louis to Phoenix right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Phoenix, momondo offers a useful price alert feature which will track prices for flights to Phoenix from St. Louis and alert you when they change.

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