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Cheap flights from St. Louis to Phoenix from $66

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 10/10. 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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Find the cheapest flights from St. Louis to Phoenix

Cheap round-trip flights

Frontier Logo
7:45 pm - 12:29 amSTL-PHX
5h 44m1 stop
Frontier Logo
7:25 am - 11:24 amPHX-STL
2h 59mnonstop
$150Frontier
Find Deal
Fri, Nov 7 - Mon, Nov 10
Frontier Logo
10:59 pm - 12:21 amSTL-PHX
3h 22mnonstop
Frontier Logo
2:27 pm - 7:26 pmPHX-STL
2h 59mnonstop
$151Frontier
Find Deal
Fri, Oct 10 - Mon, Oct 13
Frontier Logo
10:49 am - 7:10 pmSTL-PHX
10h 21m1 stop
Frontier Logo
6:00 am - 3:04 pmPHX-STL
7h 04m1 stop
$152Frontier
Find Deal
Thu, Oct 2 - Sun, Oct 5
Frontier Logo
7:52 pm - 7:59 amSTL-PHX
14h 07m1 stop
Frontier Logo
9:59 pm - 9:07 amPHX-STL
9h 08m1 stop
$153Frontier
Find Deal
Sun, Oct 12 - Mon, Oct 13
Frontier Logo
10:59 pm - 12:21 amSTL-PHX
3h 22mnonstop
Frontier Logo
8:03 pm - 11:43 amPHX-STL
13h 40m1 stop
$155Frontier
Find Deal
Fri, Oct 17 - Sun, Oct 19
Frontier Logo
7:52 pm - 7:59 amSTL-PHX
14h 07m1 stop
Frontier Logo
9:59 pm - 9:07 amPHX-STL
9h 08m1 stop
$158Frontier
Find Deal
Wed, Oct 15 - Fri, Oct 17
American Airlines Logo
7:31 am - 9:05 amSTL-PHX
3h 34mnonstop
American Airlines Logo
6:50 pm - 11:57 pmPHX-STL
3h 07mnonstop
$174American Airlines
Find Deal
Sat, Oct 18 - Mon, Oct 20
American Airlines Logo
7:00 am - 8:34 amSTL-PHX
3h 34mnonstop
American Airlines Logo
3:25 pm - 8:27 pmPHX-STL
3h 02mnonstop
$185American Airlines
Find Deal
Tue, Oct 14 - Tue, Oct 28
Southwest Logo
8:15 pm - 10:40 pmSTL-PHX
3h 25mnonstop
Southwest Logo
8:30 pm - 12:25 amPHX-STL
2h 55mnonstop
$218Southwest
Find Deal
Wed, Nov 19 - Tue, Nov 25
Logo
10:57 am - 9:53 amSTL-PHX
24h 56m1 stop
Logo
5:15 pm - 10:14 pmPHX-STL
2h 59mnonstop
$227
Find Deal
Thu, Oct 9 - Fri, Oct 10

Frontier flights from St. Louis to Phoenix

Our best Frontier deals on St. Louis to Phoenix flight tickets
Frontier
Nov 7
STL7:45 pmLambert-St Louis
5h 44m
1 stop
PHX12:29 amPhoenix Sky Harbor Intl
Nov 10
PHX7:25 amPhoenix Sky Harbor Intl
2h 59m
STL11:24 amLambert-St Louis
$150
Find similar
Frontier
Oct 10
STL10:59 pmLambert-St Louis
3h 22m
PHX12:21 amPhoenix Sky Harbor Intl
Oct 13
PHX2:27 pmPhoenix Sky Harbor Intl
2h 59m
STL7:26 pmLambert-St Louis
$151
Find similar
Frontier
Oct 2
STL10:49 amLambert-St Louis
10h 21m
1 stop
PHX7:10 pmPhoenix Sky Harbor Intl
Oct 5
PHX6:00 amPhoenix Sky Harbor Intl
7h 04m
1 stop
STL3:04 pmLambert-St Louis
$152
Find similar

American Airlines flights from St. Louis to Phoenix

Our best American Airlines deals on St. Louis to Phoenix flight tickets
American Airlines
Oct 18
STL7:31 amLambert-St Louis
3h 34m
PHX9:05 amPhoenix Sky Harbor Intl
Oct 20
PHX6:50 pmPhoenix Sky Harbor Intl
3h 07m
STL11:57 pmLambert-St Louis
$174
Find similar
American Airlines
Oct 14
STL7:00 amLambert-St Louis
3h 34m
PHX8:34 amPhoenix Sky Harbor Intl
Oct 28
PHX3:25 pmPhoenix Sky Harbor Intl
3h 02m
STL8:27 pmLambert-St Louis
$185
Find similar
American Airlines
Dec 11
STL7:00 amLambert-St Louis
3h 31m
PHX9:31 amPhoenix Sky Harbor Intl
Dec 15
PHX9:44 amPhoenix Sky Harbor Intl
3h 07m
STL1:51 pmLambert-St Louis
$209
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 September 16, 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

Fri 11/7

7:45 pm-12:29 am

1 stop5h 44m

Phoenix Sky Harbor Intl

Mon 11/10

7:25 am-11:24 am

Nonstop2h 59m

$150

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Fri 10/10

10:59 pm-12:21 am

Nonstop3h 22m

Phoenix Sky Harbor Intl

Mon 10/13

2:27 pm-7:26 pm

Nonstop2h 59m

$151

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Thu 10/2

10:49 am-7:10 pm

1 stop10h 21m

Phoenix Sky Harbor Intl

Sun 10/5

6:00 am-3:04 pm

1 stop7h 04m

$152

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sun 10/12

7:52 pm-7:59 am

1 stop14h 07m

Phoenix Sky Harbor Intl

Mon 10/13

9:59 pm-9:07 am

1 stop9h 08m

$153

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Fri 10/17

10:59 pm-12:21 am

Nonstop3h 22m

Phoenix Sky Harbor Intl

Sun 10/19

8:03 pm-11:43 am

1 stop13h 40m

$155

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 10/15

7:52 pm-7:59 am

1 stop14h 07m

Phoenix Sky Harbor Intl

Fri 10/17

9:59 pm-9:07 am

1 stop9h 08m

$158

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sat 10/18

7:31 am-9:05 am

Nonstop3h 34m

Phoenix Sky Harbor Intl

Mon 10/20

6:50 pm-11:57 pm

Nonstop3h 07m

$174

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Tue 10/14

7:00 am-8:34 am

Nonstop3h 34m

Phoenix Sky Harbor Intl

Tue 10/28

3:25 pm-8:27 pm

Nonstop3h 02m

$185

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 11/19

8:15 pm-10:40 pm

Nonstop3h 25m

Phoenix Sky Harbor Intl

Tue 11/25

8:30 pm-12:25 am

Nonstop2h 55m

$218

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Thu 10/9

10:57 am-9:53 am

1 stop24h 56m

Phoenix Sky Harbor Intl

Fri 10/10

5:15 pm-10:14 pm

Nonstop2h 59m

$227

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 August, then departing from St. Louis during the month November is also very affordable. Most momondo users find prices during this month for around $354.

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 $393. 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 $485.

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 $393. In the morning is when there is more demand to fly to Phoenix, so prices are often more expensive at around $449 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 $395 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 $358 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 15m

Direct flights

Every day

Airports in Phoenix

1 airport
The fastest flight from St. Louis to Phoenix takes 3h 15m
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 $106Free CancellationRating
5.8
3,172 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $158Free CancellationRating
6.3
8,015 reviews
Search Spirit Airlines flights
DeltaPriceFrom $236Free CancellationRating
7.9
7,954 reviews
Search Delta flights
American AirlinesPriceFrom $262Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
SouthwestPriceFrom $275Free CancellationRating
8.0
4,242 reviews
Search Southwest flights
United AirlinesPriceFrom $294Free CancellationRating
7.4
8,929 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