Cheap flights from Phoenix to St. Louis from $71

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Phoenix to St. Louis departing on 9/7. 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

Frontier Logo
5:15 pm - 10:14 pmPHX-STL
2h 59mnonstop
Frontier Logo
8:21 pm - 9:43 pmSTL-PHX
3h 22mnonstop
$95Frontier
Find Deal
Fri, Oct 10 - Mon, Oct 13
Frontier Logo
7:30 pm - 9:07 amPHX-STL
11h 37m1 stop
Frontier Logo
10:59 pm - 12:21 amSTL-PHX
3h 22mnonstop
$117Frontier
Find Deal
Tue, Oct 21 - Fri, Oct 24
Frontier Logo
7:30 pm - 9:07 amPHX-STL
11h 37m1 stop
Frontier Logo
8:21 pm - 9:43 pmSTL-PHX
3h 22mnonstop
$126Frontier
Find Deal
Wed, Oct 15 - Mon, Oct 20
American Airlines Logo
3:25 pm - 8:27 pmPHX-STL
3h 02mnonstop
American Airlines Logo
7:00 am - 8:34 amSTL-PHX
3h 34mnonstop
$161American Airlines
Find Deal
Tue, Oct 21 - Tue, Oct 28
American Airlines Logo
6:50 pm - 11:57 pmPHX-STL
3h 07mnonstop
American Airlines Logo
7:31 am - 9:05 amSTL-PHX
3h 34mnonstop
$196American Airlines
Find Deal
Thu, Oct 23 - Sat, Oct 25
Delta Logo
12:40 am - 8:51 amPHX-STL
6h 11m1 stop
Delta Logo
4:45 pm - 11:04 pmSTL-PHX
8h 19m1 stop
$244Delta
Find Deal
Wed, Oct 22 - Sat, Oct 25
Delta Logo
12:40 am - 8:51 amPHX-STL
6h 11m1 stop
Delta Logo
3:30 pm - 8:01 pmSTL-PHX
6h 31m1 stop
$251Delta
Find Deal
Thu, Oct 23 - Mon, Oct 27
 Logo
6:00 am - 3:04 pmPHX-STL
7h 04m1 stop
 Logo
4:00 pm - 12:23 pmSTL-PHX
22h 23m2 stops
Sun, Sep 21 - Sun, Sep 28
 Logo
8:58 pm - 9:07 amPHX-STL
10h 09m2 stops
 Logo
10:57 am - 12:08 pmSTL-PHX
27h 11m1 stop
Thu, Oct 23 - Sun, Oct 26
Southwest Logo
6:55 pm - 11:50 pmPHX-STL
2h 55mnonstop
Southwest Logo
10:30 pm - 11:50 pmSTL-PHX
3h 20mnonstop
$284Southwest
Find Deal
Thu, Oct 23 - Sun, Oct 26

Frontier flights from Phoenix to St. Louis

Our best Frontier deals on Phoenix to St. Louis flight tickets
Frontier
Oct 10
PHX5:15 pmPhoenix Sky Harbor Intl
2h 59m
STL10:14 pmLambert-St Louis
Oct 13
STL8:21 pmLambert-St Louis
3h 22m
PHX9:43 pmPhoenix Sky Harbor Intl
Frontier
Oct 21
PHX7:30 pmPhoenix Sky Harbor Intl
11h 37m
1 stop
STL9:07 amLambert-St Louis
Oct 24
STL10:59 pmLambert-St Louis
3h 22m
PHX12:21 amPhoenix Sky Harbor Intl
Frontier
Sep 8
PHX6:00 amPhoenix Sky Harbor Intl
7h 04m
1 stop
STL3:04 pmLambert-St Louis
Oct 17
STL10:59 pmLambert-St Louis
3h 22m
PHX12:21 amPhoenix Sky Harbor Intl

American Airlines flights from Phoenix to St. Louis

Our best American Airlines deals on Phoenix to St. Louis flight tickets
American Airlines
Oct 21
PHX3:25 pmPhoenix Sky Harbor Intl
3h 02m
STL8:27 pmLambert-St Louis
Oct 28
STL7:00 amLambert-St Louis
3h 34m
PHX8:34 amPhoenix Sky Harbor Intl
American Airlines
Oct 23
PHX6:50 pmPhoenix Sky Harbor Intl
3h 07m
STL11:57 pmLambert-St Louis
Oct 25
STL7:31 amLambert-St Louis
3h 34m
PHX9:05 amPhoenix Sky Harbor Intl
American Airlines
Oct 16
PHX6:50 pmPhoenix Sky Harbor Intl
3h 07m
STL11:57 pmLambert-St Louis
Oct 20
STL7:31 amLambert-St Louis
3h 34m
PHX9:05 amPhoenix Sky Harbor Intl

momondo Fare Finder

 
Customize your flight search to find flights from Phoenix to St. Louis 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 26, 2025.
Use the filters below to find and compare flights from Phoenix to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Fri 10/10

5:15 pm-10:14 pm

Nonstop2h 59m

Lambert-St Louis

Mon 10/13

8:21 pm-9:43 pm

Nonstop3h 22m

$95

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Tue 10/21

7:30 pm-9:07 am

1 stop11h 37m

Lambert-St Louis

Fri 10/24

10:59 pm-12:21 am

Nonstop3h 22m

$117

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Wed 10/15

7:30 pm-9:07 am

1 stop11h 37m

Lambert-St Louis

Mon 10/20

8:21 pm-9:43 pm

Nonstop3h 22m

$126

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Tue 10/21

3:25 pm-8:27 pm

Nonstop3h 02m

Lambert-St Louis

Tue 10/28

7:00 am-8:34 am

Nonstop3h 34m

$161

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Thu 10/23

6:50 pm-11:57 pm

Nonstop3h 07m

Lambert-St Louis

Sat 10/25

7:31 am-9:05 am

Nonstop3h 34m

$196

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Wed 10/22

12:40 am-8:51 am

1 stop6h 11m

Lambert-St Louis

Sat 10/25

4:45 pm-11:04 pm

1 stop8h 19m

$244

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Thu 10/23

12:40 am-8:51 am

1 stop6h 11m

Lambert-St Louis

Mon 10/27

3:30 pm-8:01 pm

1 stop6h 31m

$251

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Sun 9/21

6:00 am-3:04 pm

1 stop7h 04m

Lambert-St Louis

Sun 9/28

4:00 pm-12:23 pm

2 stops22h 23m

$263

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Thu 10/23

8:58 pm-9:07 am

2 stops10h 09m

Lambert-St Louis

Sun 10/26

10:57 am-12:08 pm

1 stop27h 11m

$270

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Thu 10/23

6:55 pm-11:50 pm

Nonstop2h 55m

Lambert-St Louis

Sun 10/26

10:30 pm-11:50 pm

Nonstop3h 20m

$284

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 St. Louis from

How to get the cheapest flight ticket from Phoenix to St. Louis

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 St. Louis?

In general, September is the cheapest month to fly from Phoenix to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $298. The month of August is another great option to travel to St. Louis, with average flight prices from Phoenix averaging around $342.

What is the cheapest day to depart on your flight to St. Louis?

The cheapest day to depart on your flight to St. Louis is on a Tuesday when prices can be found for as low as $398. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $450. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

What is the cheapest time of day to depart on your flight to St. Louis?

Flying to St. Louis from Phoenix in the evening is the least expensive time of day to depart. momondo users have found prices as low as $401 when looking at flights departing in the evening. At noon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $450 per ticket.

What is the cheapest Phoenix to Lambert-St Louis flight route?

Fly from Phoenix Sky Harbor Intl to Lambert-St Louis for the best Phoenix - Lambert-St Louis flight prices

How far in advance should I book a flight to St. Louis?

You are more likely to see cheaper flights to St. Louis from Phoenix when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $392 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from Phoenix for as low as $329 on momondo.

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

There are 3 cabin classes available to choose from on Phoenix to Lambert-St Louis flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Cheap Phoenix to St. Louis flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Phoenix to St. Louis

Fastest flight time

2h 49m

Direct flights

Every day

Airports in St. Louis

1 airport
The fastest flight from Phoenix to St. Louis takes 2h 49m
Direct flights go from Phoenix to St. Louis every day.
There is 1 airport near St. Louis: Lambert-St Louis (STL)
  • How far is Phoenix to Lambert-St Louis by plane?

    The distance between Phoenix and Lambert-St Louis is about 1269.1 mi. Flights usually cover this in 2h 55m, depending on flying conditions and air traffic around both airports.

  • When did momondo last update prices for flights from Phoenix to Lambert-St Louis Airport?

    Prices for flights from Phoenix to Lambert-St Louis Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Phoenix to Lambert-St Louis Airport?

  • How old do you have to be to fly from Phoenix to Lambert-St Louis Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Phoenix to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The required travel and health documents for your Lambert-St Louis Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Lambert-St Louis Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Best airlines flying from Phoenix to St. Louis

Compare and see reviews for airlines that fly from Phoenix to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $115Free CancellationRating
5.8
3,200 reviews
Search Frontier flights
United AirlinesPriceFrom $198Free CancellationRating
7.4
8,943 reviews
Search United Airlines flights
DeltaPriceFrom $236Free CancellationRating
7.9
7,979 reviews
Search Delta flights
American AirlinesPriceFrom $269Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
SouthwestPriceFrom $283Free CancellationRating
8.0
4,242 reviews
Search Southwest flights

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Hermann
Fairview Heights
Maryland Heights
Florissant
O'Fallon
Fenton
Collinsville
Wentzville
Alton
St. Peters
Farmington
Festus
Glencoe
Clayton
Edwardsville
Eureka
Litchfield
Shrewsbury

Why use momondo?

Why should I use momondo to find a flight deal from Phoenix to St. Louis?

Finding the right flight to St. Louis from Phoenix is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to St. Louis quick and easy, saving you time and money.

Can I find flights from Phoenix to St. Louis with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to St. Louis from Phoenix with this policy.

How can momondo help me find flights from Phoenix to St. Louis?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Phoenix to St. Louis.

I’m not ready to book a flight from Phoenix to St. Louis right now. Can momondo alert me if prices change?

Price alerts on flights to St. Louis from Phoenix are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

An easier way to manage your St. Louis trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

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1 adult
Sun 8/31
Sun 9/7

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