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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 2/27. 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.
Frontier Logo
8:52 pm - 11:23 pmSTL-PHX
3h 31mnonstop
Frontier Logo
4:10 pm - 8:07 pmPHX-STL
2h 57mnonstop
$145Frontier
Find Deal
Mon, Dec 22 - Mon, Jan 5
Frontier Logo
7:43 pm - 8:06 amSTL-PHX
13h 23m1 stop
Frontier Logo
7:25 am - 11:22 amPHX-STL
2h 57mnonstop
$146Frontier
Find Deal
Wed, Dec 3 - Mon, Dec 8
Frontier Logo
3:53 pm - 6:26 pmSTL-PHX
3h 33mnonstop
Frontier Logo
10:26 pm - 10:14 amPHX-STL
10h 48m1 stop
$147Frontier
Find Deal
Fri, Nov 28 - Fri, Dec 5
Frontier Logo
3:53 pm - 6:26 pmSTL-PHX
3h 33mnonstop
Frontier Logo
7:43 pm - 12:12 pmPHX-STL
15h 29m1 stop
$148Frontier
Find Deal
Fri, Nov 28 - Wed, Dec 3
Frontier Logo
1:16 pm - 6:31 pmSTL-PHX
6h 15m1 stop
Frontier Logo
4:32 pm - 10:14 amPHX-STL
16h 42m1 stop
$150Frontier
Find Deal
Thu, Dec 4 - Tue, Dec 9
Frontier Logo
7:43 pm - 8:06 amSTL-PHX
13h 23m1 stop
Frontier Logo
7:25 am - 11:22 amPHX-STL
2h 57mnonstop
$152Frontier
Find Deal
Wed, Dec 10 - Fri, Dec 12
Frontier Logo
12:09 pm - 2:31 pmSTL-PHX
3h 22mnonstop
Frontier Logo
7:25 am - 11:24 amPHX-STL
2h 59mnonstop
$153Frontier
Find Deal
Mon, Nov 10 - Mon, Nov 17
American Airlines Logo
7:00 am - 9:36 amSTL-PHX
3h 36mnonstop
American Airlines Logo
9:36 am - 1:40 pmPHX-STL
3h 04mnonstop
$176American Airlines
Find Deal
Sat, Nov 15 - Wed, Nov 19
Multiple Airlines Logo
3:53 pm - 6:26 pmSTL-PHX
3h 33mnonstop
Multiple Airlines Logo
7:43 pm - 9:47 amPHX-STL
13h 04m2 stops
$189Multiple Airlines
Find Deal
Mon, Dec 1 - Sat, Dec 6
Southwest Logo
1:45 pm - 5:45 pmSTL-PHX
5h 00m1 stop
Southwest Logo
4:15 pm - 8:05 pmPHX-STL
2h 50mnonstop
$192Southwest
Find Deal
Sat, Nov 15 - Wed, Nov 19

Frontier flights from St. Louis to Phoenix

Our best Frontier deals on St. Louis to Phoenix flight tickets
Frontier
Dec 22
STL8:52 pmLambert-St Louis
3h 31m
PHX11:23 pmPhoenix Sky Harbor Intl
Jan 5
PHX4:10 pmPhoenix Sky Harbor Intl
2h 57m
STL8:07 pmLambert-St Louis
$145
Find similar
Frontier
Dec 3
STL7:43 pmLambert-St Louis
13h 23m
1 stop
PHX8:06 amPhoenix Sky Harbor Intl
Dec 8
PHX7:25 amPhoenix Sky Harbor Intl
2h 57m
STL11:22 amLambert-St Louis
$146
Find similar
Frontier
Nov 28
STL3:53 pmLambert-St Louis
3h 33m
PHX6:26 pmPhoenix Sky Harbor Intl
Dec 5
PHX10:26 pmPhoenix Sky Harbor Intl
10h 48m
1 stop
STL10:14 amLambert-St Louis
$147
Find similar

American Airlines flights from St. Louis to Phoenix

Our best American Airlines deals on St. Louis to Phoenix flight tickets
American Airlines
Nov 15
STL7:00 amLambert-St Louis
3h 36m
PHX9:36 amPhoenix Sky Harbor Intl
Nov 19
PHX9:36 amPhoenix Sky Harbor Intl
3h 04m
STL1:40 pmLambert-St Louis
$176
Find similar
American Airlines
Nov 8
STL2:29 pmLambert-St Louis
3h 36m
PHX5:05 pmPhoenix Sky Harbor Intl
Nov 12
PHX7:55 pmPhoenix Sky Harbor Intl
2h 56m
STL11:51 pmLambert-St Louis
$242
Find similar
American Airlines
Nov 10
STL2:29 pmLambert-St Louis
3h 36m
PHX5:05 pmPhoenix Sky Harbor Intl
Nov 13
PHX12:58 amPhoenix Sky Harbor Intl
6h 11m
1 stop
STL8:09 amLambert-St Louis
$252
Find similar

momondo Fare Finder

 
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, momondo users made 832,500 searches. Data last updated October 30, 2025.
Use the filters below to find and compare flights from St. Louis to Phoenix that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Mon 12/22

8:52 pm-11:23 pm

Nonstop3h 31m

Phoenix Sky Harbor Intl

Mon 1/5

4:10 pm-8:07 pm

Nonstop2h 57m

$145

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 12/3

7:43 pm-8:06 am

1 stop13h 23m

Phoenix Sky Harbor Intl

Mon 12/8

7:25 am-11:22 am

Nonstop2h 57m

$146

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Fri 11/28

3:53 pm-6:26 pm

Nonstop3h 33m

Phoenix Sky Harbor Intl

Fri 12/5

10:26 pm-10:14 am

1 stop10h 48m

$147

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Fri 11/28

3:53 pm-6:26 pm

Nonstop3h 33m

Phoenix Sky Harbor Intl

Wed 12/3

7:43 pm-12:12 pm

1 stop15h 29m

$148

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Thu 12/4

1:16 pm-6:31 pm

1 stop6h 15m

Phoenix Sky Harbor Intl

Tue 12/9

4:32 pm-10:14 am

1 stop16h 42m

$150

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 12/10

7:43 pm-8:06 am

1 stop13h 23m

Phoenix Sky Harbor Intl

Fri 12/12

7:25 am-11:22 am

Nonstop2h 57m

$152

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Mon 11/10

12:09 pm-2:31 pm

Nonstop3h 22m

Phoenix Sky Harbor Intl

Mon 11/17

7:25 am-11:24 am

Nonstop2h 59m

$153

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sat 11/15

7:00 am-9:36 am

Nonstop3h 36m

Phoenix Sky Harbor Intl

Wed 11/19

9:36 am-1:40 pm

Nonstop3h 04m

$176

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Mon 12/1

3:53 pm-6:26 pm

Nonstop3h 33m

Phoenix Sky Harbor Intl

Sat 12/6

7:43 pm-9:47 am

2 stops13h 04m

$189

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sat 11/15

1:45 pm-5:45 pm

1 stop5h 00m

Phoenix Sky Harbor Intl

Wed 11/19

4:15 pm-8:05 pm

Nonstop2h 50m

$192

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

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?

If you are unable to visit Phoenix 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 $333.

What is the cheapest day to depart on your flight to Phoenix?

On average, the least expensive day to fly to Phoenix 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. On the other hand, Sunday is the most expensive day to depart from St. Louis because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $481.

What is the cheapest time of day to depart on your flight to Phoenix?

The cheapest time of day to fly to Phoenix is at noon when flights can be purchased for as low as $371. In the morning is when there is more demand to fly to Phoenix, so prices are often more expensive at around $443 per ticket.

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

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

How far in advance should I book a flight to Phoenix?

You are more likely to see cheaper flights to Phoenix from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Phoenix for around $384 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Phoenix from St. Louis for as low as $312 on momondo.

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

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

Cheap St. Louis to Phoenix flight deals and tips

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

Fastest flight time

3h 22m

Direct flights

Every day

Airports in Phoenix

1 airport
The fastest flight from St. Louis to Phoenix takes 3h 22m
Direct flights go from St. Louis to Phoenix every day.
There is 1 airport near Phoenix: Phoenix Sky Harbor Intl (PHX)
Search flight deals

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

    The distance between Lambert-St Louis and Phoenix is about 1269.1 mi. By plane, this route typically takes 3h 22m.

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

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

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

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

    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.

  • What documentation or ID do you need to fly to Phoenix?

    The travel and health documents you'll need for your trip to Phoenix 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. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Best airlines flying from St. Louis to Phoenix

Compare and see reviews for airlines that fly from St. Louis to Phoenix with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $99Free CancellationRating
5.8
3,123 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $158Free CancellationRating
6.3
8,115 reviews
Search Spirit Airlines flights
DeltaPriceFrom $236Free CancellationRating
7.9
7,993 reviews
Search Delta flights
American AirlinesPriceFrom $243Free CancellationRating
7.2
11,030 reviews
Search American Airlines flights
SouthwestPriceFrom $251Free CancellationRating
8.0
4,242 reviews
Search Southwest flights
United AirlinesPriceFrom $294Free CancellationRating
7.4
8,998 reviews
Search United Airlines flights

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?

Flights from St. Louis to Phoenix with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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

momondo helps you find the best flight between St. Louis and Phoenix by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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

Of course. momondo tracks the price of St. Louis to Phoenix flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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Find better results for your trip to the United States

Fly into one of these airports located in Phoenix

Airports listed have a maximum distance of 25.4 mi from Phoenix
Phoenix-Mesa Gateway Airport