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Cheap flights from Phoenix to St. Louis from $29

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 11/28. 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 Phoenix to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
5:56 pm - 9:40 amPHX-STL
38h 44m2 stops
Frontier Logo
8:42 pm - 11:13 pmSTL-PHX
3h 31mnonstop
$147Frontier
Find Deal
vie., dic. 26 - vie., ene. 2
Frontier Logo
11:14 am - 3:08 pmPHX-STL
2h 54mnonstop
Frontier Logo
10:44 pm - 1:47 pmSTL-PHX
16h 03m1 stop
$149Frontier
Find Deal
lun., dic. 1 - vie., dic. 5
Frontier Logo
11:14 am - 3:08 pmPHX-STL
2h 54mnonstop
Frontier Logo
7:03 pm - 12:13 amSTL-PHX
6h 10m1 stop
$152Frontier
Find Deal
lun., dic. 1 - lun., dic. 1
Frontier Logo
7:25 am - 11:22 amPHX-STL
2h 57mnonstop
Frontier Logo
1:16 pm - 8:48 amSTL-PHX
20h 32m1 stop
$153Frontier
Find Deal
vie., dic. 5 - dom., dic. 7
Frontier Logo
11:14 am - 3:08 pmPHX-STL
2h 54mnonstop
Frontier Logo
7:43 pm - 12:44 amSTL-PHX
6h 01m1 stop
$154Frontier
Find Deal
lun., dic. 1 - vie., dic. 5
Frontier Logo
10:31 pm - 10:02 amPHX-STL
10h 31m1 stop
Frontier Logo
4:27 pm - 9:32 amSTL-PHX
18h 05m2 stops
$155Frontier
Find Deal
jue., dic. 25 - mié., dic. 31
Frontier Logo
10:31 pm - 10:02 amPHX-STL
10h 31m1 stop
Frontier Logo
10:48 am - 11:49 pmSTL-PHX
38h 01m2 stops
$156Frontier
Find Deal
jue., dic. 25 - mar., dic. 30
Frontier Logo
9:23 am - 9:09 pmPHX-STL
10h 46m1 stop
Frontier Logo
3:53 pm - 6:26 pmSTL-PHX
3h 33mnonstop
$157Frontier
Find Deal
mar., nov. 25 - lun., dic. 1
Frontier Logo
10:31 pm - 10:02 amPHX-STL
10h 31m1 stop
Frontier Logo
10:42 am - 8:21 amSTL-PHX
22h 39m2 stops
$158Frontier
Find Deal
vie., dic. 26 - jue., ene. 1
Frontier Logo
6:00 am - 10:33 pmPHX-STL
15h 33m2 stops
Frontier Logo
7:43 pm - 3:07 pmSTL-PHX
20h 24m1 stop
$160Frontier
Find Deal
lun., dic. 8 - mié., dic. 10

Frontier flights from Phoenix to St. Louis

Our best Frontier deals on Phoenix to St. Louis flight tickets
Frontier
Dec 25
PHX12:59 amPhoenix Sky Harbor Intl
7h 46m
1 stop
STL9:45 amLambert-St Louis
Jan 2
STL10:10 pmLambert-St Louis
12h 30m
1 stop
PHX9:40 amPhoenix Sky Harbor Intl
$147
Find similar
Frontier
Dec 1
PHX11:14 amPhoenix Sky Harbor Intl
2h 54m
STL3:08 pmLambert-St Louis
Dec 5
STL10:44 pmLambert-St Louis
16h 03m
1 stop
PHX1:47 pmPhoenix Sky Harbor Intl
$149
Find similar
Frontier
Dec 1
PHX11:14 amPhoenix Sky Harbor Intl
2h 54m
STL3:08 pmLambert-St Louis
Dec 1
STL7:03 pmLambert-St Louis
6h 10m
1 stop
PHX12:13 amPhoenix Sky Harbor Intl
$152
Find similar

American Airlines flights from Phoenix to St. Louis

Our best American Airlines deals on Phoenix to St. Louis flight tickets
American Airlines
Dec 13
PHX9:44 amPhoenix Sky Harbor Intl
3h 07m
STL1:51 pmLambert-St Louis
Dec 15
STL2:37 pmLambert-St Louis
3h 29m
PHX5:06 pmPhoenix Sky Harbor Intl
$174
Find similar
American Airlines
Nov 18
PHX7:55 pmPhoenix Sky Harbor Intl
2h 56m
STL11:51 pmLambert-St Louis
Nov 22
STL7:00 amLambert-St Louis
3h 36m
PHX9:36 amPhoenix Sky Harbor Intl
$353
Find similar
American Airlines
Nov 17
PHX12:30 amPhoenix Sky Harbor Intl
8h 05m
1 stop
STL9:35 amLambert-St Louis
Nov 22
STL7:00 amLambert-St Louis
3h 36m
PHX9:36 amPhoenix Sky Harbor Intl
$363
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 noviembre 12, 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

vie. 12/26

5:56 pm-9:40 am

2 stops38h 44m

Lambert-St Louis

vie. 1/2

8:42 pm-11:13 pm

Nonstop3h 31m

$147

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

lun. 12/1

11:14 am-3:08 pm

Nonstop2h 54m

Lambert-St Louis

vie. 12/5

10:44 pm-1:47 pm

1 stop16h 03m

$149

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

lun. 12/1

11:14 am-3:08 pm

Nonstop2h 54m

Lambert-St Louis

lun. 12/1

7:03 pm-12:13 am

1 stop6h 10m

$152

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

vie. 12/5

7:25 am-11:22 am

Nonstop2h 57m

Lambert-St Louis

dom. 12/7

1:16 pm-8:48 am

1 stop20h 32m

$153

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

lun. 12/1

11:14 am-3:08 pm

Nonstop2h 54m

Lambert-St Louis

vie. 12/5

7:43 pm-12:44 am

1 stop6h 01m

$154

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

jue. 12/25

10:31 pm-10:02 am

1 stop10h 31m

Lambert-St Louis

mié. 12/31

4:27 pm-9:32 am

2 stops18h 05m

$155

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

jue. 12/25

10:31 pm-10:02 am

1 stop10h 31m

Lambert-St Louis

mar. 12/30

10:48 am-11:49 pm

2 stops38h 01m

$156

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

mar. 11/25

9:23 am-9:09 pm

1 stop10h 46m

Lambert-St Louis

lun. 12/1

3:53 pm-6:26 pm

Nonstop3h 33m

$157

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

vie. 12/26

10:31 pm-10:02 am

1 stop10h 31m

Lambert-St Louis

jue. 1/1

10:42 am-8:21 am

2 stops22h 39m

$158

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

lun. 12/8

6:00 am-10:33 pm

2 stops15h 33m

Lambert-St Louis

mié. 12/10

7:43 pm-3:07 pm

1 stop20h 24m

$160

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, November 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 $337. The month of October is another great option to travel to St. Louis, with average flight prices from Phoenix averaging around $338.

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 $373. 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 afternoon 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 afternoon. At noon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $413 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 $390 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 $334 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 50m

Direct flights

Every day

Airports in St. Louis

1 airport
The fastest flight from Phoenix to St. Louis takes 2h 50m
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 53m, 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 $113Free CancellationRating
5.8
3,114 reviews
Search Frontier flights
United AirlinesPriceFrom $198Free CancellationRating
7.4
9,015 reviews
Search United Airlines flights
American AirlinesPriceFrom $253Free CancellationRating
7.2
11,049 reviews
Search American Airlines flights
DeltaPriceFrom $259Free CancellationRating
7.9
8,009 reviews
Search Delta flights
SouthwestPriceFrom $276Free CancellationRating
8.0
4,235 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
Wentzville
Fenton
Collinsville
St. Peters
Alton
Farmington
Festus
Glencoe
Edwardsville
Clayton
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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