Latest deals
Insights
FAQs
Reviews
Price Alerts

Cheap flights from Phoenix to St. Louis from $49

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 11/3. 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

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Phoenix to St. Louis

Cheap round-trip flights

American Airlines Logo
3:25 pm - 8:27 pmPHX-STL
3h 02mnonstop
American Airlines Logo
7:31 am - 9:05 amSTL-PHX
3h 34mnonstop
$195American Airlines
Find Deal
Wed, Oct 15 - Wed, Oct 22
Frontier Logo
8:00 am - 9:06 amPHX-STL
23h 06m1 stop
Frontier Logo
7:55 pm - 7:32 amSTL-PHX
13h 37m1 stop
$199Frontier
Find Deal
Tue, Sep 23 - Thu, Sep 25
Frontier Logo
8:00 am - 3:56 pmPHX-STL
5h 56m1 stop
Frontier Logo
7:45 pm - 3:13 pmSTL-PHX
20h 28m2 stops
$200Frontier
Find Deal
Sat, Nov 1 - Sat, Nov 8
Frontier Logo
8:00 am - 9:06 amPHX-STL
23h 06m1 stop
Frontier Logo
7:55 pm - 12:06 pmSTL-PHX
18h 11m2 stops
$201Frontier
Find Deal
Wed, Oct 1 - Mon, Oct 6
Frontier Logo
1:02 pm - 9:06 amPHX-STL
18h 04m2 stops
Frontier Logo
4:58 pm - 10:49 pmSTL-PHX
7h 51m1 stop
$204Frontier
Find Deal
Wed, Sep 24 - Sat, Sep 27
Frontier Logo
7:30 pm - 9:07 amPHX-STL
11h 37m1 stop
Frontier Logo
7:52 pm - 3:28 pmSTL-PHX
21h 36m2 stops
$205Frontier
Find Deal
Wed, Oct 15 - Wed, Oct 22
American Airlines Logo
6:50 pm - 11:57 pmPHX-STL
3h 07mnonstop
American Airlines Logo
6:23 pm - 7:46 pmSTL-PHX
3h 23mnonstop
$209American Airlines
Find Deal
Thu, Oct 23 - Mon, Oct 27
Frontier Logo
8:20 pm - 9:06 amPHX-STL
10h 46m1 stop
Frontier Logo
7:55 pm - 11:27 pmSTL-PHX
5h 32m1 stop
$210Frontier
Find Deal
Mon, Sep 22 - Thu, Sep 25
Delta Logo
3:20 pm - 11:28 pmPHX-STL
7h 08m1 stop
Delta Logo
2:20 pm - 6:53 pmSTL-PHX
5h 33m1 stop
$237Delta
Find Deal
Sat, Dec 13 - Mon, Dec 15
Southwest Logo
4:50 pm - 9:45 pmPHX-STL
2h 55mnonstop
Southwest Logo
5:15 am - 6:35 amSTL-PHX
3h 20mnonstop
$244Southwest
Find Deal
Mon, Oct 20 - Thu, Oct 23

American Airlines flights from Phoenix to St. Louis

Our best American Airlines deals on Phoenix to St. Louis flight tickets
American Airlines
Oct 15
PHX3:25 pmPhoenix Sky Harbor Intl
3h 02m
STL8:27 pmLambert-St Louis
Oct 22
STL7:31 amLambert-St Louis
3h 34m
PHX9:05 amPhoenix Sky Harbor Intl
$195
Find similar
American Airlines
Oct 23
PHX6:50 pmPhoenix Sky Harbor Intl
3h 07m
STL11:57 pmLambert-St Louis
Oct 27
STL6:23 pmLambert-St Louis
3h 23m
PHX7:46 pmPhoenix Sky Harbor Intl
$209
Find similar
American Airlines
Oct 13
PHX6:50 pmPhoenix Sky Harbor Intl
3h 07m
STL11:57 pmLambert-St Louis
Oct 20
STL6:21 pmLambert-St Louis
3h 21m
PHX7:42 pmPhoenix Sky Harbor Intl
$219
Find similar

Frontier flights from Phoenix to St. Louis

Our best Frontier deals on Phoenix to St. Louis flight tickets
Frontier
Sep 23
PHX8:00 amPhoenix Sky Harbor Intl
23h 06m
1 stop
STL9:06 amLambert-St Louis
Sep 25
STL7:55 pmLambert-St Louis
13h 37m
1 stop
PHX7:32 amPhoenix Sky Harbor Intl
$199
Find similar
Frontier
Nov 1
PHX8:00 amPhoenix Sky Harbor Intl
5h 56m
1 stop
STL3:56 pmLambert-St Louis
Nov 8
STL7:45 pmLambert-St Louis
20h 28m
2 stops
PHX3:13 pmPhoenix Sky Harbor Intl
$200
Find similar
Frontier
Oct 1
PHX8:00 amPhoenix Sky Harbor Intl
23h 06m
1 stop
STL9:06 amLambert-St Louis
Oct 6
STL7:55 pmLambert-St Louis
18h 11m
2 stops
PHX12:06 pmPhoenix Sky Harbor Intl
$201
Find similar

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 September 17, 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

Wed 10/15

3:25 pm-8:27 pm

Nonstop3h 02m

Lambert-St Louis

Wed 10/22

7:31 am-9:05 am

Nonstop3h 34m

$195

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Tue 9/23

8:00 am-9:06 am

1 stop23h 06m

Lambert-St Louis

Thu 9/25

7:55 pm-7:32 am

1 stop13h 37m

$199

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Sat 11/1

8:00 am-3:56 pm

1 stop5h 56m

Lambert-St Louis

Sat 11/8

7:45 pm-3:13 pm

2 stops20h 28m

$200

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Wed 10/1

8:00 am-9:06 am

1 stop23h 06m

Lambert-St Louis

Mon 10/6

7:55 pm-12:06 pm

2 stops18h 11m

$201

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Wed 9/24

1:02 pm-9:06 am

2 stops18h 04m

Lambert-St Louis

Sat 9/27

4:58 pm-10:49 pm

1 stop7h 51m

$204

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Wed 10/15

7:30 pm-9:07 am

1 stop11h 37m

Lambert-St Louis

Wed 10/22

7:52 pm-3:28 pm

2 stops21h 36m

$205

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Thu 10/23

6:50 pm-11:57 pm

Nonstop3h 07m

Lambert-St Louis

Mon 10/27

6:23 pm-7:46 pm

Nonstop3h 23m

$209

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Mon 9/22

8:20 pm-9:06 am

1 stop10h 46m

Lambert-St Louis

Thu 9/25

7:55 pm-11:27 pm

1 stop5h 32m

$210

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Sat 12/13

3:20 pm-11:28 pm

1 stop7h 08m

Lambert-St Louis

Mon 12/15

2:20 pm-6:53 pm

1 stop5h 33m

$237

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Mon 10/20

4:50 pm-9:45 pm

Nonstop2h 55m

Lambert-St Louis

Thu 10/23

5:15 am-6:35 am

Nonstop3h 20m

$244

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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, August 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 $345. The month of September is another great option to travel to St. Louis, with average flight prices from Phoenix averaging around $345.

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 $392. 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 $397 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 $435 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 $396 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 $344 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)
Search flight deals

  • 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 $118Free CancellationRating
5.8
3,173 reviews
Search Frontier flights
United AirlinesPriceFrom $198Free CancellationRating
7.4
8,926 reviews
Search United Airlines flights
DeltaPriceFrom $236Free CancellationRating
7.9
7,961 reviews
Search Delta flights
American AirlinesPriceFrom $275Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
SouthwestPriceFrom $278Free 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
Florissant
Maryland Heights
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.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Fri 10/17
Fri 10/24
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States