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Cheap flights from St. Louis to Phoenix from $89

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 9/30. 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
8:10 pm - 11:33 pm
STL
-
PHX
29h 23m
1 stop
Frontier Logo
8:16 am - 7:15 pm
PHX
-
STL
8h 59m
1 stop
$152Frontier
Tue, Oct 13 - Wed, Oct 21
Frontier Logo
8:10 pm - 8:00 am
STL
-
PHX
13h 50m
1 stop
Frontier Logo
9:15 am - 7:17 pm
PHX
-
STL
8h 02m
1 stop
$158Frontier
Wed, Sep 16 - Wed, Sep 23
Alaska Airlines Logo
6:29 am - 7:07 pm
STL
-
PHX
14h 38m
2 stops
Alaska Airlines Logo
7:49 pm - 5:10 pm
PHX
-
STL
19h 21m
2 stops
$233Alaska Airlines
Wed, Sep 23 - Tue, Sep 29
Alaska Airlines Logo
6:29 am - 7:07 pm
STL
-
PHX
14h 38m
2 stops
Alaska Airlines Logo
7:49 pm - 6:38 pm
PHX
-
STL
20h 49m
2 stops
$233Alaska Airlines
Tue, Sep 22 - Tue, Sep 29
Southwest Logo
8:45 pm - 10:00 pm
STL
-
PHX
3h 15mnonstop
Southwest Logo
6:35 pm - 11:25 pm
PHX
-
STL
2h 50mnonstop
$277Southwest
Wed, Sep 30 - Wed, Oct 7
Southwest Logo
11:50 am - 1:00 pm
STL
-
PHX
3h 10mnonstop
Southwest Logo
6:10 am - 11:05 am
PHX
-
STL
2h 55mnonstop
$277Southwest
Sat, Aug 29 - Sat, Sep 5
American Airlines Logo
2:30 pm - 3:46 pm
STL
-
PHX
3h 16mnonstop
American Airlines Logo
3:44 pm - 8:52 pm
PHX
-
STL
3h 08mnonstop
$277American Airlines
Wed, Sep 9 - Wed, Sep 23
American Airlines Logo
2:31 pm - 3:58 pm
STL
-
PHX
3h 27mnonstop
American Airlines Logo
3:43 pm - 8:43 pm
PHX
-
STL
3h 00mnonstop
$277American Airlines
Wed, Oct 21 - Wed, Oct 28
United Airlines Logo
8:00 am - 3:16 pm
STL
-
PHX
9h 16m
2 stops
United Airlines Logo
1:34 pm - 8:46 pm
PHX
-
STL
5h 12m
1 stop
$392United Airlines
Sat, Aug 29 - Tue, Sep 1
United Airlines Logo
12:59 pm - 10:09 pm
STL
-
PHX
11h 10m
2 stops
United Airlines Logo
6:00 am - 12:40 pm
PHX
-
STL
4h 40m
1 stop
$392United Airlines
Wed, Sep 2 - Sat, Sep 5

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Frontier flights from St. Louis to Phoenix

Our best Frontier deals on St. Louis to Phoenix flight tickets
Frontier
Oct 13
STL8:10 pmLambert-St Louis
29h 23m
1 stop
PHX11:33 pmPhoenix Sky Harbor Intl
Oct 21
PHX8:16 amPhoenix Sky Harbor Intl
8h 59m
1 stop
STL7:15 pmLambert-St Louis
$152
Frontier
Sep 16
STL8:10 pmLambert-St Louis
13h 50m
1 stop
PHX8:00 amPhoenix Sky Harbor Intl
Sep 23
PHX9:15 amPhoenix Sky Harbor Intl
8h 02m
1 stop
STL7:17 pmLambert-St Louis
$158
Frontier
Oct 7
STL8:10 pmLambert-St Louis
20h 25m
1 stop
PHX2:35 pmPhoenix Sky Harbor Intl
Oct 13
PHX6:36 pmPhoenix Sky Harbor Intl
22h 39m
1 stop
STL7:15 pmLambert-St Louis
$163

American Airlines flights from St. Louis to Phoenix

Our best American Airlines deals on St. Louis to Phoenix flight tickets
American Airlines
Aug 11
STL8:00 amLambert-St Louis
3h 18m
PHX9:18 amPhoenix Sky Harbor Intl
Aug 18
PHX12:30 pmPhoenix Sky Harbor Intl
3h 07m
STL5:37 pmLambert-St Louis
$450
American Airlines
Aug 11
STL4:54 pmLambert-St Louis
7h 49m
1 stop
PHX10:43 pmPhoenix Sky Harbor Intl
Aug 18
PHX12:30 pmPhoenix Sky Harbor Intl
3h 07m
STL5:37 pmLambert-St Louis
$460
American Airlines
Aug 4
STL8:01 amLambert-St Louis
3h 16m
PHX9:17 amPhoenix Sky Harbor Intl
Aug 8
PHX12:30 pmPhoenix Sky Harbor Intl
3h 07m
STL5:37 pmLambert-St Louis
$485

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 August 1, 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

Tue 10/13

8:10 pm-11:33 pm

1 stop29h 23m

Phoenix Sky Harbor Intl

Wed 10/21

8:16 am-7:15 pm

1 stop8h 59m

$152

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 9/16

8:10 pm-8:00 am

1 stop13h 50m

Phoenix Sky Harbor Intl

Wed 9/23

9:15 am-7:17 pm

1 stop8h 02m

$158

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 9/23

6:29 am-7:07 pm

2 stops14h 38m

Phoenix Sky Harbor Intl

Tue 9/29

7:49 pm-5:10 pm

2 stops19h 21m

$233

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Tue 9/22

6:29 am-7:07 pm

2 stops14h 38m

Phoenix Sky Harbor Intl

Tue 9/29

7:49 pm-6:38 pm

2 stops20h 49m

$233
Quickest round-trip

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 9/30

8:45 pm-10:00 pm

Nonstop3h 15m

Phoenix Sky Harbor Intl

Wed 10/7

6:35 pm-11:25 pm

Nonstop2h 50m

$277

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sat 8/29

11:50 am-1:00 pm

Nonstop3h 10m

Phoenix Sky Harbor Intl

Sat 9/5

6:10 am-11:05 am

Nonstop2h 55m

$277

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 9/9

2:30 pm-3:46 pm

Nonstop3h 16m

Phoenix Sky Harbor Intl

Wed 9/23

3:44 pm-8:52 pm

Nonstop3h 08m

$277

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 10/21

2:31 pm-3:58 pm

Nonstop3h 27m

Phoenix Sky Harbor Intl

Wed 10/28

3:43 pm-8:43 pm

Nonstop3h 00m

$277

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sat 8/29

8:00 am-3:16 pm

2 stops9h 16m

Phoenix Sky Harbor Intl

Tue 9/1

1:34 pm-8:46 pm

1 stop5h 12m

$392

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 9/2

12:59 pm-10:09 pm

2 stops11h 10m

Phoenix Sky Harbor Intl

Sat 9/5

6:00 am-12:40 pm

1 stop4h 40m

$392

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?

Prices are currently low for flights on this route.

Typical prices usually range from $342 to $397.
The lowest price recently found on this route was $152.

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 December is also very affordable. Most momondo users find prices during this month for around $320.

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 $390. 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 $462.

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 $314. In the morning is when there is more demand to fly to Phoenix, so prices are often more expensive at around $450 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 $363 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 $299 on momondo.

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

There are 4 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
2,741 reviews
Search Frontier flights
United AirlinesPriceFrom $148Free CancellationRating
7.4
10,061 reviews
Search United Airlines flights
American AirlinesPriceFrom $214Free CancellationRating
7.1
11,846 reviews
Search American Airlines flights
SouthwestPriceFrom $233Free CancellationRating
8.0
4,230 reviews
Search Southwest flights
JetBluePriceFrom $292Free CancellationRating
7.1
3,033 reviews
Search JetBlue 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