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Cheap flights from St. Louis to Phoenix from $79

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 5/26. 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
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
8:08 pm - 7:44 am
STL
-
PHX
13h 36m
1 stop
Frontier Logo
12:30 am - 8:55 am
PHX
-
STL
30h 25m
2 stops
$231Frontier
Wed, Jun 3 - Sat, Jun 6
Frontier Logo
6:51 pm - 11:24 pm
STL
-
PHX
6h 33m
1 stop
Frontier Logo
7:40 am - 8:11 pm
PHX
-
STL
10h 31m
1 stop
$235Frontier
Tue, May 19 - Thu, May 21
Frontier Logo
9:18 pm - 11:24 pm
STL
-
PHX
28h 06m
1 stop
Frontier Logo
11:30 pm - 8:55 am
PHX
-
STL
7h 25m
1 stop
$236Frontier
Mon, May 18 - Fri, May 22
Frontier Logo
9:06 pm - 10:16 am
STL
-
PHX
15h 10m
2 stops
Frontier Logo
11:21 am - 7:23 pm
PHX
-
STL
6h 02m
1 stop
$237Frontier
Mon, Jun 8 - Wed, Jun 10
Frontier Logo
4:52 pm - 10:18 pm
STL
-
PHX
7h 26m
1 stop
Frontier Logo
6:40 am - 7:23 pm
PHX
-
STL
10h 43m
1 stop
$238Frontier
Sat, Jul 11 - Sat, Jul 18
Frontier Logo
3:33 pm - 12:10 pm
STL
-
PHX
22h 37m
1 stop
Frontier Logo
4:17 pm - 2:31 pm
PHX
-
STL
20h 14m
2 stops
$239Frontier
Tue, Jun 2 - Sat, Jun 6
Frontier Logo
9:06 pm - 11:23 am
STL
-
PHX
16h 17m
1 stop
Frontier Logo
7:40 am - 6:06 pm
PHX
-
STL
8h 26m
1 stop
$240Frontier
Thu, May 21 - Wed, May 27
Frontier Logo
2:52 pm - 10:57 pm
STL
-
PHX
10h 05m
1 stop
Frontier Logo
8:40 am - 7:23 pm
PHX
-
STL
8h 43m
1 stop
$244Frontier
Thu, Aug 6 - Thu, Aug 13
Frontier Logo
5:27 pm - 10:20 am
STL
-
PHX
18h 53m
2 stops
Frontier Logo
11:50 am - 7:31 pm
PHX
-
STL
5h 41m
1 stop
$245Frontier
Mon, May 25 - Sat, May 30
Frontier Logo
12:36 pm - 8:47 am
STL
-
PHX
22h 11m
1 stop
Frontier Logo
12:29 pm - 4:15 pm
PHX
-
STL
25h 46m
2 stops
$247Frontier
Sun, May 17 - Wed, May 20

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Frontier flights from St. Louis to Phoenix

Our best Frontier deals on St. Louis to Phoenix flight tickets
Frontier
Jun 3
STL8:08 pmLambert-St Louis
13h 36m
1 stop
PHX7:44 amPhoenix Sky Harbor Intl
Jun 6
PHX12:30 amPhoenix Sky Harbor Intl
30h 25m
2 stops
STL8:55 amLambert-St Louis
$231
Frontier
May 19
STL6:51 pmLambert-St Louis
6h 33m
1 stop
PHX11:24 pmPhoenix Sky Harbor Intl
May 21
PHX7:40 amPhoenix Sky Harbor Intl
10h 31m
1 stop
STL8:11 pmLambert-St Louis
$235
Frontier
May 18
STL9:18 pmLambert-St Louis
28h 06m
1 stop
PHX11:24 pmPhoenix Sky Harbor Intl
May 22
PHX11:30 pmPhoenix Sky Harbor Intl
7h 25m
1 stop
STL8:55 amLambert-St Louis
$236

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 May 4, 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

Wed 6/3

8:08 pm-7:44 am

1 stop13h 36m

Phoenix Sky Harbor Intl

Sat 6/6

12:30 am-8:55 am

2 stops30h 25m

$231
Quickest round-trip

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Tue 5/19

6:51 pm-11:24 pm

1 stop6h 33m

Phoenix Sky Harbor Intl

Thu 5/21

7:40 am-8:11 pm

1 stop10h 31m

$235

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Mon 5/18

9:18 pm-11:24 pm

1 stop28h 06m

Phoenix Sky Harbor Intl

Fri 5/22

11:30 pm-8:55 am

1 stop7h 25m

$236

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Mon 6/8

9:06 pm-10:16 am

2 stops15h 10m

Phoenix Sky Harbor Intl

Wed 6/10

11:21 am-7:23 pm

1 stop6h 02m

$237

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sat 7/11

4:52 pm-10:18 pm

1 stop7h 26m

Phoenix Sky Harbor Intl

Sat 7/18

6:40 am-7:23 pm

1 stop10h 43m

$238

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Tue 6/2

3:33 pm-12:10 pm

1 stop22h 37m

Phoenix Sky Harbor Intl

Sat 6/6

4:17 pm-2:31 pm

2 stops20h 14m

$239

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Thu 5/21

9:06 pm-11:23 am

1 stop16h 17m

Phoenix Sky Harbor Intl

Wed 5/27

7:40 am-6:06 pm

1 stop8h 26m

$240

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Thu 8/6

2:52 pm-10:57 pm

1 stop10h 05m

Phoenix Sky Harbor Intl

Thu 8/13

8:40 am-7:23 pm

1 stop8h 43m

$244

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Mon 5/25

5:27 pm-10:20 am

2 stops18h 53m

Phoenix Sky Harbor Intl

Sat 5/30

11:50 am-7:31 pm

1 stop5h 41m

$245

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sun 5/17

12:36 pm-8:47 am

1 stop22h 11m

Phoenix Sky Harbor Intl

Wed 5/20

12:29 pm-4:15 pm

2 stops25h 46m

$247

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 $376. 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 $468.

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 $308. In the morning is when there is more demand to fly to Phoenix, so prices are often more expensive at around $437 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 $351 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 $297 on momondo.

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
2,966 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $121Free CancellationRating
6.3
8,633 reviews
Search Spirit Airlines flights
DeltaPriceFrom $141Free CancellationRating
7.9
8,461 reviews
Search Delta flights
United AirlinesPriceFrom $148Free CancellationRating
7.4
9,680 reviews
Search United Airlines flights
American AirlinesPriceFrom $209Free CancellationRating
7.1
11,673 reviews
Search American Airlines flights
SouthwestPriceFrom $218Free CancellationRating
7.9
4,310 reviews
Search Southwest 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