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Cheap flights from St. Louis to Phoenix from $28

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 2/23. 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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0 bags

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Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
2:51 pm - 9:41 pm
STL
-
PHX
7h 50m
1 stop
Frontier Logo
8:00 pm - 3:53 pm
PHX
-
STL
18h 53m
2 stops
$160Frontier
Sat, Feb 21 - Tue, Feb 24
Frontier Logo
9:45 pm - 6:54 pm
STL
-
PHX
22h 09m
1 stop
Frontier Logo
6:00 am - 1:56 pm
PHX
-
STL
6h 56m
1 stop
$167Frontier
Mon, Feb 9 - Sat, Feb 14
Frontier Logo
1:54 pm - 9:29 pm
STL
-
PHX
8h 35m
1 stop
Frontier Logo
6:00 am - 1:09 pm
PHX
-
STL
6h 09m
1 stop
$169Frontier
Mon, Feb 23 - Fri, Feb 27
Frontier Logo
10:01 pm - 8:20 am
STL
-
PHX
11h 19m
1 stop
Frontier Logo
9:30 am - 9:26 pm
PHX
-
STL
10h 56m
1 stop
$170Frontier
Thu, Feb 5 - Thu, Feb 12
Frontier Logo
3:46 pm - 11:53 pm
STL
-
PHX
9h 07m
1 stop
Frontier Logo
6:51 pm - 3:53 pm
PHX
-
STL
20h 02m
1 stop
$171Frontier
Sat, Feb 7 - Tue, Feb 17
Frontier Logo
8:47 pm - 11:28 pm
STL
-
PHX
3h 41mnonstop
Frontier Logo
6:00 am - 1:56 pm
PHX
-
STL
6h 56m
1 stop
$173Frontier
Mon, Feb 16 - Sat, Feb 21
Frontier Logo
9:02 pm - 11:43 pm
STL
-
PHX
3h 41mnonstop
Frontier Logo
6:00 am - 1:09 pm
PHX
-
STL
6h 09m
1 stop
$174Frontier
Fri, Feb 20 - Fri, Feb 27
Frontier Logo
2:51 pm - 9:41 pm
STL
-
PHX
7h 50m
1 stop
Frontier Logo
5:10 pm - 6:51 am
PHX
-
STL
36h 41m
2 stops
$176Frontier
Sat, Feb 21 - Sat, Feb 28
Frontier Logo
10:11 pm - 8:50 am
STL
-
PHX
11h 39m
1 stop
Frontier Logo
10:32 pm - 1:09 pm
PHX
-
STL
13h 37m
2 stops
$178Frontier
Thu, Feb 26 - Sun, Mar 1
Frontier Logo
8:16 pm - 11:47 pm
STL
-
PHX
5h 31m
1 stop
Frontier Logo
7:25 am - 12:21 pm
PHX
-
STL
2h 56mnonstop
$179Frontier
Wed, Apr 8 - Sat, Apr 11

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
Feb 1
STL1:03 pmLambert-St Louis
3h 41m
PHX3:44 pmPhoenix Sky Harbor Intl
Feb 2
PHX2:34 pmPhoenix Sky Harbor Intl
5h 16m
1 stop
STL8:50 pmLambert-St Louis
$159
Frontier
Feb 21
STL2:51 pmLambert-St Louis
7h 50m
1 stop
PHX9:41 pmPhoenix Sky Harbor Intl
Feb 24
PHX8:00 pmPhoenix Sky Harbor Intl
18h 53m
2 stops
STL3:53 pmLambert-St Louis
$160
Frontier
Feb 1
STL1:03 pmLambert-St Louis
3h 41m
PHX3:44 pmPhoenix Sky Harbor Intl
Feb 6
PHX10:00 amPhoenix Sky Harbor Intl
27h 46m
2 stops
STL2:46 pmLambert-St Louis
$162

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 January 25, 2026.
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

Sat 2/21

2:51 pm-9:41 pm

1 stop7h 50m

Phoenix Sky Harbor Intl

Tue 2/24

8:00 pm-3:53 pm

2 stops18h 53m

$160

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Mon 2/9

9:45 pm-6:54 pm

1 stop22h 09m

Phoenix Sky Harbor Intl

Sat 2/14

6:00 am-1:56 pm

1 stop6h 56m

$167

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Mon 2/23

1:54 pm-9:29 pm

1 stop8h 35m

Phoenix Sky Harbor Intl

Fri 2/27

6:00 am-1:09 pm

1 stop6h 09m

$169

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Thu 2/5

10:01 pm-8:20 am

1 stop11h 19m

Phoenix Sky Harbor Intl

Thu 2/12

9:30 am-9:26 pm

1 stop10h 56m

$170

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sat 2/7

3:46 pm-11:53 pm

1 stop9h 07m

Phoenix Sky Harbor Intl

Tue 2/17

6:51 pm-3:53 pm

1 stop20h 02m

$171

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Mon 2/16

8:47 pm-11:28 pm

Nonstop3h 41m

Phoenix Sky Harbor Intl

Sat 2/21

6:00 am-1:56 pm

1 stop6h 56m

$173

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Fri 2/20

9:02 pm-11:43 pm

Nonstop3h 41m

Phoenix Sky Harbor Intl

Fri 2/27

6:00 am-1:09 pm

1 stop6h 09m

$174

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sat 2/21

2:51 pm-9:41 pm

1 stop7h 50m

Phoenix Sky Harbor Intl

Sat 2/28

5:10 pm-6:51 am

2 stops36h 41m

$176

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Thu 2/26

10:11 pm-8:50 am

1 stop11h 39m

Phoenix Sky Harbor Intl

Sun 3/1

10:32 pm-1:09 pm

2 stops13h 37m

$178

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 4/8

8:16 pm-11:47 pm

1 stop5h 31m

Phoenix Sky Harbor Intl

Sat 4/11

7:25 am-12:21 pm

Nonstop2h 56m

$179

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, 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 $308. If you are unable to visit Phoenix Sky Harbor Intl Airport during the month of November, then departing from St. Louis during the month October is also very affordable. Most momondo users find prices during this month for around $312.

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 $467. 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?

In the evening 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 $349. Flying to Phoenix Sky Harbor Intl Airport in the evening 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 $433. 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 $364 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 $317 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 30% 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 January 2026, prices for St. Louis to Phoenix Sky Harbor Intl Airport flights are approximately 30% 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

$172

Fastest flight time

3h 10m

Direct flights

Every day
The best one-way flight to Phoenix Sky Harbor Intl Airport from St. Louis in the past 72 hours is $172. The best round-trip flight deal from St. Louis to Phoenix Sky Harbor Intl Airport found on momondo in the last 72 hours is $290.
The fastest flight from St. Louis to Phoenix Sky Harbor Intl Airport takes 3h 10m
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 10m 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
5.7
3,058 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $121Free CancellationRating
6.3
8,375 reviews
Search Spirit Airlines flights
United AirlinesPriceFrom $148Free CancellationRating
7.4
9,198 reviews
Search United Airlines flights
American AirlinesPriceFrom $212Free CancellationRating
7.2
11,192 reviews
Search American Airlines flights
SouthwestPriceFrom $221Free CancellationRating
8.0
4,269 reviews
Search Southwest flights
DeltaPriceFrom $236Free CancellationRating
7.9
8,113 reviews
Search Delta flights

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

    Southwest operates around 25 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 $397, but momondo users have found Southwest deals from St. Louis to Phoenix Sky Harbor Intl Airport from as low as $221 round-trip. Southwest has been scored 8.0/10 in 4,269 reviews.

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

    American Airlines (7.2/10 from 11,192 reviews) operates around 9 flights from St. Louis to Phoenix Sky Harbor Intl Airport in any given week. The average American Airlines airfare for this route is around $383, with deals from around $212 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
Chandler
Glendale
Gilbert
Peoria
Casa Grande
Surprise
Goodyear
Buckeye
Payson
Apache Junction
Paradise Valley
Avondale
Wickenburg
Camp Verde
Litchfield Park
Guadalupe
Fountain Hills

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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