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Cheap flights from St. Louis to Phoenix from $67

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 9/11. 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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Cheap round-trip flights

American Airlines Logo
2:29 pm - 5:05 pmSTL-PHX
3h 36mnonstop
American Airlines Logo
7:54 pm - 11:50 pmPHX-STL
2h 56mnonstop
$161American Airlines
Find Deal
Wed, Nov 5 - Sat, Nov 8
American Airlines Logo
7:53 am - 9:08 amSTL-PHX
3h 15mnonstop
American Airlines Logo
12:59 pm - 6:00 pmPHX-STL
3h 01mnonstop
$176American Airlines
Find Deal
Wed, Aug 27 - Wed, Sep 3
Spirit Airlines Logo
2:30 pm - 9:37 pmSTL-PHX
9h 07m1 stop
Spirit Airlines Logo
10:42 pm - 1:32 pmPHX-STL
12h 50m1 stop
$183Spirit Airlines
Find Deal
Thu, Aug 14 - Sun, Aug 17
Frontier Logo
2:54 pm - 4:16 pmSTL-PHX
3h 22mnonstop
Frontier Logo
8:00 am - 12:59 pmPHX-STL
2h 59mnonstop
$189Frontier
Find Deal
Mon, Oct 20 - Fri, Oct 24
Frontier Logo
2:54 pm - 4:16 pmSTL-PHX
3h 22mnonstop
Frontier Logo
8:00 am - 12:59 pmPHX-STL
2h 59mnonstop
$198Frontier
Find Deal
Fri, Oct 17 - Mon, Oct 20
Spirit Airlines Logo
2:30 pm - 9:37 pmSTL-PHX
9h 07m1 stop
Spirit Airlines Logo
10:42 pm - 1:32 pmPHX-STL
12h 50m1 stop
$205Spirit Airlines
Find Deal
Fri, Aug 15 - Sun, Aug 17
Southwest Logo
10:20 am - 2:20 pmSTL-PHX
6h 00m1 stop
Southwest Logo
5:40 pm - 10:35 pmPHX-STL
2h 55mnonstop
$221Southwest
Find Deal
Wed, Aug 27 - Wed, Sep 3
Southwest Logo
2:25 pm - 7:00 pmSTL-PHX
6h 35m2 stops
Southwest Logo
7:35 pm - 12:30 amPHX-STL
2h 55mnonstop
$226Southwest
Find Deal
Tue, Sep 30 - Tue, Oct 7
Delta Logo
2:29 pm - 6:09 pmSTL-PHX
5h 40m1 stop
Delta Logo
9:50 am - 6:40 pmPHX-STL
6h 50m1 stop
$237Delta
Find Deal
Tue, Oct 14 - Tue, Oct 21
Delta Logo
7:40 pm - 12:38 amSTL-PHX
5h 58m1 stop
Delta Logo
3:05 pm - 11:02 pmPHX-STL
6h 57m1 stop
$244Delta
Find Deal
Thu, Nov 6 - Tue, Nov 11

Spirit Airlines flights from St. Louis to Phoenix

Our best Spirit Airlines deals on St. Louis to Phoenix flight tickets
Spirit Airlines
Aug 14
STL2:30 pmLambert-St Louis
9h 07m
1 stop
PHX9:37 pmPhoenix Sky Harbor Intl
Aug 17
PHX10:42 pmPhoenix Sky Harbor Intl
12h 50m
1 stop
STL1:32 pmLambert-St Louis
$183
Find similar
Spirit Airlines
Aug 14
STL2:30 pmLambert-St Louis
9h 07m
1 stop
PHX9:37 pmPhoenix Sky Harbor Intl
Aug 17
PHX10:42 pmPhoenix Sky Harbor Intl
12h 50m
1 stop
STL1:32 pmLambert-St Louis
$189
Find similar
Spirit Airlines
Aug 15
STL2:30 pmLambert-St Louis
9h 07m
1 stop
PHX9:37 pmPhoenix Sky Harbor Intl
Aug 17
PHX10:42 pmPhoenix Sky Harbor Intl
12h 50m
1 stop
STL1:32 pmLambert-St Louis
$205
Find similar

Frontier flights from St. Louis to Phoenix

Our best Frontier deals on St. Louis to Phoenix flight tickets
Frontier
Oct 20
STL2:54 pmLambert-St Louis
3h 22m
PHX4:16 pmPhoenix Sky Harbor Intl
Oct 24
PHX8:00 amPhoenix Sky Harbor Intl
2h 59m
STL12:59 pmLambert-St Louis
$189
Find similar
Frontier
Oct 17
STL2:54 pmLambert-St Louis
3h 22m
PHX4:16 pmPhoenix Sky Harbor Intl
Oct 20
PHX8:00 amPhoenix Sky Harbor Intl
2h 59m
STL12:59 pmLambert-St Louis
$198
Find similar
Frontier
Oct 30
STL7:52 pmLambert-St Louis
5h 37m
1 stop
PHX11:29 pmPhoenix Sky Harbor Intl
Nov 3
PHX8:00 amPhoenix Sky Harbor Intl
2h 59m
STL11:59 amLambert-St Louis
$248
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 August 1, 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

Wed 11/5

2:29 pm-5:05 pm

Nonstop3h 36m

Phoenix Sky Harbor Intl

Sat 11/8

7:54 pm-11:50 pm

Nonstop2h 56m

$161

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 8/27

7:53 am-9:08 am

Nonstop3h 15m

Phoenix Sky Harbor Intl

Wed 9/3

12:59 pm-6:00 pm

Nonstop3h 01m

$176

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Thu 8/14

2:30 pm-9:37 pm

1 stop9h 07m

Phoenix Sky Harbor Intl

Sun 8/17

10:42 pm-1:32 pm

1 stop12h 50m

$183

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Mon 10/20

2:54 pm-4:16 pm

Nonstop3h 22m

Phoenix Sky Harbor Intl

Fri 10/24

8:00 am-12:59 pm

Nonstop2h 59m

$189

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Fri 10/17

2:54 pm-4:16 pm

Nonstop3h 22m

Phoenix Sky Harbor Intl

Mon 10/20

8:00 am-12:59 pm

Nonstop2h 59m

$198

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Fri 8/15

2:30 pm-9:37 pm

1 stop9h 07m

Phoenix Sky Harbor Intl

Sun 8/17

10:42 pm-1:32 pm

1 stop12h 50m

$205

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Wed 8/27

10:20 am-2:20 pm

1 stop6h 00m

Phoenix Sky Harbor Intl

Wed 9/3

5:40 pm-10:35 pm

Nonstop2h 55m

$221

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Tue 9/30

2:25 pm-7:00 pm

2 stops6h 35m

Phoenix Sky Harbor Intl

Tue 10/7

7:35 pm-12:30 am

Nonstop2h 55m

$226

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Tue 10/14

2:29 pm-6:09 pm

1 stop5h 40m

Phoenix Sky Harbor Intl

Tue 10/21

9:50 am-6:40 pm

1 stop6h 50m

$237

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Thu 11/6

7:40 pm-12:38 am

1 stop5h 58m

Phoenix Sky Harbor Intl

Tue 11/11

3:05 pm-11:02 pm

1 stop6h 57m

$244

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 September is also very affordable. Most momondo users find prices during this month for around $305.

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 $386. 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 $494.

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 $402. 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 $379 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 $348 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

Best Price Found

$67

Fastest flight time

3h 10m

Direct flights

Every day

Airports in Phoenix

1 airport
The best one-way flight to Phoenix from St. Louis in the past 72 hours is $67. The best round-trip flight deal from St. Louis to Phoenix found on momondo in the last 72 hours is $161.
The fastest flight from St. Louis to Phoenix takes 3h 10m
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 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 $108Free CancellationRating
5.9
3,239 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $154Free CancellationRating
6.3
8,048 reviews
Search Spirit Airlines flights
American AirlinesPriceFrom $205Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
DeltaPriceFrom $216Free CancellationRating
8.0
7,981 reviews
Search Delta flights
United AirlinesPriceFrom $263Free CancellationRating
7.4
8,900 reviews
Search United Airlines flights
SouthwestPriceFrom $277Free CancellationRating
8.0
4,246 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