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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 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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Find the cheapest flights from St. Louis to Phoenix

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
8:52 pm - 11:23 pm
STL
-
PHX
3h 31mnonstop
Frontier Logo
10:16 pm - 12:40 pm
PHX
-
STL
13h 24m1 stop
$143Frontier
Mon, Jan 5 - Thu, Jan 15
Frontier Logo
7:43 pm - 8:06 am
STL
-
PHX
13h 23m1 stop
Frontier Logo
7:34 pm - 2:48 pm
PHX
-
STL
18h 14m1 stop
$146Frontier
Wed, Jan 7 - Fri, Jan 16
Frontier Logo
3:46 pm - 11:53 pm
STL
-
PHX
9h 07m1 stop
Frontier Logo
9:50 pm - 12:50 pm
PHX
-
STL
14h 00m1 stop
$147Frontier
Wed, Jan 21 - Sun, Jan 25
Frontier Logo
7:36 pm - 12:59 am
STL
-
PHX
6h 23m1 stop
Frontier Logo
8:30 am - 2:46 pm
PHX
-
STL
5h 16m1 stop
$148Frontier
Mon, Jan 19 - Wed, Jan 21
Frontier Logo
3:43 pm - 11:29 pm
STL
-
PHX
8h 46m1 stop
Frontier Logo
4:15 pm - 8:08 pm
PHX
-
STL
2h 53mnonstop
$151Frontier
Sat, Jan 17 - Mon, Jan 19
Frontier Logo
3:46 pm - 11:53 pm
STL
-
PHX
9h 07m1 stop
Frontier Logo
8:15 am - 12:08 pm
PHX
-
STL
2h 53mnonstop
$152Frontier
Wed, Jan 21 - Sun, Jan 25
Frontier Logo
7:43 pm - 8:06 am
STL
-
PHX
13h 23m1 stop
Frontier Logo
2:34 pm - 12:40 pm
PHX
-
STL
21h 06m1 stop
$154Frontier
Wed, Jan 7 - Wed, Jan 14
Frontier Logo
3:43 pm - 11:29 pm
STL
-
PHX
8h 46m1 stop
Frontier Logo
8:30 am - 2:46 pm
PHX
-
STL
5h 16m1 stop
$155Frontier
Wed, Jan 14 - Wed, Jan 21
Frontier Logo
10:10 pm - 10:16 am
STL
-
PHX
13h 06m1 stop
Frontier Logo
7:34 pm - 2:48 pm
PHX
-
STL
18h 14m1 stop
$156Frontier
Mon, Jan 5 - Fri, Jan 16
Frontier Logo
7:43 pm - 8:06 am
STL
-
PHX
13h 23m1 stop
Frontier Logo
5:10 pm - 2:48 pm
PHX
-
STL
20h 38m1 stop
$157Frontier
Sat, Jan 10 - Tue, Jan 13

Frontier flights from St. Louis to Phoenix

Our best Frontier deals on St. Louis to Phoenix flight tickets
Frontier
Jan 5
STL8:52 pmLambert-St Louis
3h 31m
PHX11:23 pmPhoenix Sky Harbor Intl
Jan 14
PHX2:34 pmPhoenix Sky Harbor Intl
21h 06m
1 stop
STL12:40 pmLambert-St Louis
$143
Find similar
Frontier
Jan 7
STL7:43 pmLambert-St Louis
13h 23m
1 stop
PHX8:06 amPhoenix Sky Harbor Intl
Jan 16
PHX7:34 pmPhoenix Sky Harbor Intl
18h 14m
1 stop
STL2:48 pmLambert-St Louis
$146
Find similar
Frontier
Jan 21
STL3:46 pmLambert-St Louis
9h 07m
1 stop
PHX11:53 pmPhoenix Sky Harbor Intl
Jan 25
PHX9:50 pmPhoenix Sky Harbor Intl
14h 00m
1 stop
STL12:50 pmLambert-St Louis
$147
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 December 18, 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 1/5

8:52 pm-11:23 pm

Nonstop3h 31m

Phoenix Sky Harbor Intl

Thu 1/15

10:16 pm-12:40 pm

1 stop13h 24m

$143

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 1/7

7:43 pm-8:06 am

1 stop13h 23m

Phoenix Sky Harbor Intl

Fri 1/16

7:34 pm-2:48 pm

1 stop18h 14m

$146

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 1/21

3:46 pm-11:53 pm

1 stop9h 07m

Phoenix Sky Harbor Intl

Sun 1/25

9:50 pm-12:50 pm

1 stop14h 00m

$147

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Mon 1/19

7:36 pm-12:59 am

1 stop6h 23m

Phoenix Sky Harbor Intl

Wed 1/21

8:30 am-2:46 pm

1 stop5h 16m

$148

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sat 1/17

3:43 pm-11:29 pm

1 stop8h 46m

Phoenix Sky Harbor Intl

Mon 1/19

4:15 pm-8:08 pm

Nonstop2h 53m

$151

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 1/21

3:46 pm-11:53 pm

1 stop9h 07m

Phoenix Sky Harbor Intl

Sun 1/25

8:15 am-12:08 pm

Nonstop2h 53m

$152

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 1/7

7:43 pm-8:06 am

1 stop13h 23m

Phoenix Sky Harbor Intl

Wed 1/14

2:34 pm-12:40 pm

1 stop21h 06m

$154

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 1/14

3:43 pm-11:29 pm

1 stop8h 46m

Phoenix Sky Harbor Intl

Wed 1/21

8:30 am-2:46 pm

1 stop5h 16m

$155

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Mon 1/5

10:10 pm-10:16 am

1 stop13h 06m

Phoenix Sky Harbor Intl

Fri 1/16

7:34 pm-2:48 pm

1 stop18h 14m

$156

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sat 1/10

7:43 pm-8:06 am

1 stop13h 23m

Phoenix Sky Harbor Intl

Tue 1/13

5:10 pm-2:48 pm

1 stop20h 38m

$157

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 $313.

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 $370. 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 $477.

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 $373. In the morning is when there is more demand to fly to Phoenix, so prices are often more expensive at around $436 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 $372 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 $339 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 18m

Direct flights

Every day

Airports in Phoenix

3 airports
The fastest flight from St. Louis to Phoenix takes 3h 18m
Direct flights go from St. Louis to Phoenix every day.
There are 3 airports in Phoenix. From St. Louis there are direct flights to 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 18m.

  • 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 $94Free CancellationRating
5.8
3,081 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $158Free CancellationRating
6.3
8,190 reviews
Search Spirit Airlines flights
United AirlinesPriceFrom $210Free CancellationRating
7.4
9,093 reviews
Search United Airlines flights
American AirlinesPriceFrom $217Free CancellationRating
7.2
11,055 reviews
Search American Airlines flights
SouthwestPriceFrom $222Free CancellationRating
7.9
4,250 reviews
Search Southwest flights
DeltaPriceFrom $236Free CancellationRating
7.9
8,008 reviews
Search Delta 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