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Cheap flights from St. Louis to Phoenix from $77

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 7/27. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from St. Louis to Phoenix

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
7:10 pm - 3:53 pm
STL
-
PHX
22h 43m
2 stops
Frontier Logo
10:27 pm - 7:36 pm
PHX
-
STL
19h 09m
1 stop
$239Frontier
Thu, Aug 13 - Wed, Aug 19
Frontier Logo
7:03 pm - 11:27 am
STL
-
PHX
18h 24m
1 stop
Frontier Logo
9:04 am - 8:57 am
PHX
-
STL
21h 53m
2 stops
$240Frontier
Wed, Jul 29 - Tue, Aug 4
Frontier Logo
7:10 pm - 12:59 pm
STL
-
PHX
19h 49m
1 stop
Frontier Logo
7:45 am - 6:15 pm
PHX
-
STL
8h 30m
1 stop
$241Frontier
Mon, Jul 13 - Thu, Jul 30
Frontier Logo
7:10 pm - 11:27 am
STL
-
PHX
18h 17m
1 stop
Frontier Logo
9:58 pm - 6:15 pm
PHX
-
STL
18h 17m
1 stop
$243Frontier
Sun, Aug 2 - Wed, Aug 5
Frontier Logo
7:10 pm - 12:59 pm
STL
-
PHX
19h 49m
1 stop
Frontier Logo
9:58 pm - 6:05 pm
PHX
-
STL
18h 07m
1 stop
$244Frontier
Mon, Jul 13 - Mon, Jul 20
Frontier Logo
7:10 pm - 11:27 am
STL
-
PHX
18h 17m
1 stop
Frontier Logo
9:58 pm - 6:15 pm
PHX
-
STL
18h 17m
1 stop
$245Frontier
Sun, Jul 12 - Wed, Jul 29
Frontier Logo
7:10 pm - 11:27 am
STL
-
PHX
18h 17m
1 stop
Frontier Logo
9:58 pm - 6:15 pm
PHX
-
STL
18h 17m
1 stop
$246Frontier
Fri, Jul 10 - Wed, Jul 29
Frontier Logo
7:10 pm - 11:27 am
STL
-
PHX
18h 17m
1 stop
Frontier Logo
11:23 pm - 8:57 am
PHX
-
STL
7h 34m
1 stop
$248Frontier
Fri, Jul 10 - Fri, Jul 17
Frontier Logo
2:56 pm - 11:00 pm
STL
-
PHX
10h 04m
1 stop
Frontier Logo
9:58 pm - 6:05 pm
PHX
-
STL
18h 07m
1 stop
$249Frontier
Sat, Jul 4 - Mon, Jul 20
Frontier Logo
6:58 pm - 11:25 pm
STL
-
PHX
6h 27m
1 stop
Frontier Logo
6:24 am - 2:48 pm
PHX
-
STL
6h 24m
1 stop
$250Frontier
Tue, Aug 18 - Wed, Aug 19

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Frontier flights from St. Louis to Phoenix

Our best Frontier deals on St. Louis to Phoenix flight tickets
Frontier
Aug 13
STL7:10 pmLambert-St Louis
22h 43m
2 stops
PHX3:53 pmPhoenix Sky Harbor Intl
Aug 19
PHX10:27 pmPhoenix Sky Harbor Intl
19h 09m
1 stop
STL7:36 pmLambert-St Louis
$239
Frontier
Jul 29
STL7:03 pmLambert-St Louis
18h 24m
1 stop
PHX11:27 amPhoenix Sky Harbor Intl
Aug 4
PHX9:04 amPhoenix Sky Harbor Intl
21h 53m
2 stops
STL8:57 amLambert-St Louis
$240
Frontier
Jul 13
STL7:10 pmLambert-St Louis
19h 49m
1 stop
PHX12:59 pmPhoenix Sky Harbor Intl
Jul 30
PHX7:45 amPhoenix Sky Harbor Intl
8h 30m
1 stop
STL6:15 pmLambert-St Louis
$241

American Airlines flights from St. Louis to Phoenix

Our best American Airlines deals on St. Louis to Phoenix flight tickets
American Airlines
Jun 30
STL8:00 amLambert-St Louis
3h 23m
PHX9:23 amPhoenix Sky Harbor Intl
Jul 27
PHX1:15 amPhoenix Sky Harbor Intl
9h 36m
1 stop
STL12:51 pmLambert-St Louis
$369
American Airlines
Jun 30
STL8:00 amLambert-St Louis
3h 23m
PHX9:23 amPhoenix Sky Harbor Intl
Jul 28
PHX6:52 pmPhoenix Sky Harbor Intl
3h 06m
STL11:58 pmLambert-St Louis
$384
American Airlines
Jul 1
STL8:00 amLambert-St Louis
3h 23m
PHX9:23 amPhoenix Sky Harbor Intl
Jul 9
PHX6:52 pmPhoenix Sky Harbor Intl
3h 06m
STL11:58 pmLambert-St Louis
$386

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 June 17, 2026.
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

Cheapest round-trip

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Thu 8/13

7:10 pm-3:53 pm

2 stops22h 43m

Phoenix Sky Harbor Intl

Wed 8/19

10:27 pm-7:36 pm

1 stop19h 09m

$239

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 7/29

7:03 pm-11:27 am

1 stop18h 24m

Phoenix Sky Harbor Intl

Tue 8/4

9:04 am-8:57 am

2 stops21h 53m

$240

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Mon 7/13

7:10 pm-12:59 pm

1 stop19h 49m

Phoenix Sky Harbor Intl

Thu 7/30

7:45 am-6:15 pm

1 stop8h 30m

$241

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sun 8/2

7:10 pm-11:27 am

1 stop18h 17m

Phoenix Sky Harbor Intl

Wed 8/5

9:58 pm-6:15 pm

1 stop18h 17m

$243

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Mon 7/13

7:10 pm-12:59 pm

1 stop19h 49m

Phoenix Sky Harbor Intl

Mon 7/20

9:58 pm-6:05 pm

1 stop18h 07m

$244

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sun 7/12

7:10 pm-11:27 am

1 stop18h 17m

Phoenix Sky Harbor Intl

Wed 7/29

9:58 pm-6:15 pm

1 stop18h 17m

$245

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Fri 7/10

7:10 pm-11:27 am

1 stop18h 17m

Phoenix Sky Harbor Intl

Wed 7/29

9:58 pm-6:15 pm

1 stop18h 17m

$246

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Fri 7/10

7:10 pm-11:27 am

1 stop18h 17m

Phoenix Sky Harbor Intl

Fri 7/17

11:23 pm-8:57 am

1 stop7h 34m

$248

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sat 7/4

2:56 pm-11:00 pm

1 stop10h 04m

Phoenix Sky Harbor Intl

Mon 7/20

9:58 pm-6:05 pm

1 stop18h 07m

$249
Quickest round-trip

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Tue 8/18

6:58 pm-11:25 pm

1 stop6h 27m

Phoenix Sky Harbor Intl

Wed 8/19

6:24 am-2:48 pm

1 stop6h 24m

$250

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 typical price of a round-trip flight between St. Louis and Phoenix?

What is the cheapest month to fly to Phoenix?

If you are unable to visit Phoenix during the month of December, then departing from St. Louis during the month January is also very affordable. Most momondo users find prices during this month for around $54.

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 $380. 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 $457.

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

The cheapest time of day to fly to Phoenix is in the evening when flights can be purchased for as low as $312. 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 from St. Louis 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 $357 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 $294 on momondo.

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

There are 3 cabin classes available to choose from on 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 10m

Direct flights

Every day

Airports in Phoenix

3 airports
The fastest flight from St. Louis to Phoenix takes 3h 10m
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

Frequently asked questions about flying from St. Louis to Phoenix

  • 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 10m.

  • 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
5.6
2,881 reviews
Search Frontier flights
United AirlinesPriceFrom $148Free CancellationRating
7.4
9,845 reviews
Search United Airlines flights
American AirlinesPriceFrom $213Free CancellationRating
7.1
11,670 reviews
Search American Airlines flights
SouthwestPriceFrom $218Free CancellationRating
7.9
4,235 reviews
Search Southwest flights
DeltaPriceFrom $236Free CancellationRating
7.8
8,406 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