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Cheap flights from St. Louis to Phoenix from $29

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 11/21. 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.
Frontier Logo
7:43 pm - 12:44 amSTL-PHX
6h 01m1 stop
Frontier Logo
10:31 pm - 10:02 amPHX-STL
10h 31m1 stop
$141Frontier
Find Deal
Fri, Dec 12 - Sun, Jan 4
Frontier Logo
9:32 pm - 8:07 pmSTL-PHX
23h 35m1 stop
Frontier Logo
9:58 pm - 12:50 pmPHX-STL
13h 52m1 stop
$142Frontier
Find Deal
Sun, Jan 25 - Sun, Feb 1
Frontier Logo
8:42 pm - 11:13 pmSTL-PHX
3h 31mnonstop
Frontier Logo
4:10 pm - 8:07 pmPHX-STL
2h 57mnonstop
$143Frontier
Find Deal
Fri, Jan 2 - Mon, Jan 5
Frontier Logo
9:54 pm - 6:31 pmSTL-PHX
21h 37m1 stop
Frontier Logo
3:43 pm - 10:02 amPHX-STL
17h 19m1 stop
$144Frontier
Find Deal
Mon, Dec 1 - Fri, Jan 2
Frontier Logo
3:46 pm - 12:10 pmSTL-PHX
21h 24m1 stop
Frontier Logo
8:15 am - 12:08 pmPHX-STL
2h 53mnonstop
$145Frontier
Find Deal
Wed, Jan 28 - Sun, Feb 1
Frontier Logo
5:44 pm - 8:18 amSTL-PHX
15h 34m1 stop
Frontier Logo
10:31 pm - 10:02 amPHX-STL
10h 31m1 stop
$146Frontier
Find Deal
Wed, Feb 11 - Fri, Feb 27
Frontier Logo
12:07 pm - 2:38 pmSTL-PHX
3h 31mnonstop
Frontier Logo
3:50 pm - 7:47 pmPHX-STL
2h 57mnonstop
$147Frontier
Find Deal
Fri, Dec 12 - Fri, Dec 19
Frontier Logo
9:14 pm - 11:55 pmSTL-PHX
3h 41mnonstop
Frontier Logo
1:00 pm - 2:46 pmPHX-STL
24h 46m1 stop
$149Frontier
Find Deal
Fri, Jan 16 - Tue, Feb 3
Frontier Logo
12:07 pm - 2:38 pmSTL-PHX
3h 31mnonstop
Frontier Logo
6:00 am - 10:33 pmPHX-STL
15h 33m2 stops
$150Frontier
Find Deal
Fri, Dec 12 - Mon, Dec 15
Frontier Logo
9:54 pm - 8:19 amSTL-PHX
11h 25m1 stop
Frontier Logo
11:14 am - 3:08 pmPHX-STL
2h 54mnonstop
$152Frontier
Find Deal
Wed, Nov 26 - Mon, Dec 1

Frontier flights from St. Louis to Phoenix Sky Harbor Intl Airport

Our best Frontier deals on St. Louis to Phoenix Sky Harbor Intl Airport flight tickets
Frontier
Jan 2
STL8:42 pmLambert-St Louis
3h 31m
PHX11:13 pmPhoenix Sky Harbor Intl
Jan 5
PHX4:10 pmPhoenix Sky Harbor Intl
2h 57m
STL8:07 pmLambert-St Louis
$143
Find similar
Frontier
Dec 19
STL7:43 pmLambert-St Louis
19h 50m
1 stop
PHX2:33 pmPhoenix Sky Harbor Intl
Dec 27
PHX7:00 amPhoenix Sky Harbor Intl
13h 25m
1 stop
STL9:25 pmLambert-St Louis
$144
Find similar
Frontier
Nov 22
STL7:43 pmLambert-St Louis
14h 12m
1 stop
PHX8:55 amPhoenix Sky Harbor Intl
Nov 23
PHX10:43 pmPhoenix Sky Harbor Intl
21h 26m
1 stop
STL9:09 pmLambert-St Louis
$145
Find similar

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
Dec 6
STL2:37 pmLambert-St Louis
3h 29m
PHX5:06 pmPhoenix Sky Harbor Intl
Dec 13
PHX9:44 amPhoenix Sky Harbor Intl
3h 07m
STL1:51 pmLambert-St Louis
$149
Find similar
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
$279
Find similar
American Airlines
Nov 18
STL11:42 amLambert-St Louis
7h 35m
1 stop
PHX6:17 pmPhoenix Sky Harbor Intl
Dec 4
PHX8:02 pmPhoenix Sky Harbor Intl
2h 54m
STL11:56 pmLambert-St Louis
$289
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 November 13, 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

Fri 12/12

7:43 pm-12:44 am

1 stop6h 01m

Phoenix Sky Harbor Intl

Sun 1/4

10:31 pm-10:02 am

1 stop10h 31m

$141

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sun 1/25

9:32 pm-8:07 pm

1 stop23h 35m

Phoenix Sky Harbor Intl

Sun 2/1

9:58 pm-12:50 pm

1 stop13h 52m

$142

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Fri 1/2

8:42 pm-11:13 pm

Nonstop3h 31m

Phoenix Sky Harbor Intl

Mon 1/5

4:10 pm-8:07 pm

Nonstop2h 57m

$143

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Mon 12/1

9:54 pm-6:31 pm

1 stop21h 37m

Phoenix Sky Harbor Intl

Fri 1/2

3:43 pm-10:02 am

1 stop17h 19m

$144

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 1/28

3:46 pm-12:10 pm

1 stop21h 24m

Phoenix Sky Harbor Intl

Sun 2/1

8:15 am-12:08 pm

Nonstop2h 53m

$145

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 2/11

5:44 pm-8:18 am

1 stop15h 34m

Phoenix Sky Harbor Intl

Fri 2/27

10:31 pm-10:02 am

1 stop10h 31m

$146

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Fri 12/12

12:07 pm-2:38 pm

Nonstop3h 31m

Phoenix Sky Harbor Intl

Fri 12/19

3:50 pm-7:47 pm

Nonstop2h 57m

$147

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Fri 1/16

9:14 pm-11:55 pm

Nonstop3h 41m

Phoenix Sky Harbor Intl

Tue 2/3

1:00 pm-2:46 pm

1 stop24h 46m

$149

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Fri 12/12

12:07 pm-2:38 pm

Nonstop3h 31m

Phoenix Sky Harbor Intl

Mon 12/15

6:00 am-10:33 pm

2 stops15h 33m

$150

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 11/26

9:54 pm-8:19 am

1 stop11h 25m

Phoenix Sky Harbor Intl

Mon 12/1

11:14 am-3:08 pm

Nonstop2h 54m

$152

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 cheapest month to fly to Phoenix Sky Harbor Intl Airport?

In general, October 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 $313. If you are unable to visit Phoenix Sky Harbor Intl Airport during the month of October, then departing from St. Louis during the month November is also very affordable. Most momondo users find prices during this month for around $321.

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 $372. 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 $480. 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 $372. 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 $443. 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 $379 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 $310 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?

No. A direct flight is the cheapest option for a flight between St. Louis to Phoenix Sky Harbor Intl Airport.

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

As of November 2025, prices for St. Louis to Phoenix Sky Harbor Intl Airport flights are approximately 20% 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

$160

Fastest flight time

3h 22m

Direct flights

Every day
The best one-way flight to Phoenix Sky Harbor Intl Airport from St. Louis in the past 72 hours is $160. 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 22m
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 29m 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 $94Free CancellationRating
5.8
3,114 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $158Free CancellationRating
6.3
8,139 reviews
Search Spirit Airlines flights
United AirlinesPriceFrom $223Free CancellationRating
7.4
9,015 reviews
Search United Airlines flights
DeltaPriceFrom $236Free CancellationRating
7.9
8,007 reviews
Search Delta flights
American AirlinesPriceFrom $237Free CancellationRating
7.2
11,050 reviews
Search American Airlines flights
SouthwestPriceFrom $248Free CancellationRating
8.0
4,236 reviews
Search Southwest flights

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

    Southwest operates around 29 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 $417, but momondo users have found Southwest deals from St. Louis to Phoenix Sky Harbor Intl Airport from as low as $248 round-trip. Southwest has been scored 8.0/10 in 4,242 reviews.

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

    American Airlines (7.2/10 from 11,051 reviews) operates around 10 flights from St. Louis to Phoenix Sky Harbor Intl Airport in any given week. The average American Airlines airfare for this route is around $400, with deals from around $237 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
Goodyear
Buckeye
Apache Junction
Payson
Wickenburg
Avondale
Paradise Valley
Camp Verde
Fountain Hills
Litchfield Park
Cave Creek

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.

An easier way to manage your Phoenix Sky Harbor Intl Airport trip

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