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Cheap flights from Phoenix to St. Louis from $27

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 12/29. 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

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Frontier Logo
7:43 pm - 12:12 pmPHX-STL
15h 29m1 stop
Frontier Logo
12:07 pm - 2:38 pmSTL-PHX
3h 31mnonstop
$148Frontier
Find Deal
Wed, Dec 3 - Fri, Dec 5
Frontier Logo
10:53 pm - 9:07 amPHX-STL
9h 14m1 stop
Frontier Logo
7:24 pm - 11:11 pmSTL-PHX
28h 47m1 stop
$150Frontier
Find Deal
Mon, Nov 17 - Wed, Nov 19
Frontier Logo
7:25 am - 11:22 amPHX-STL
2h 57mnonstop
Frontier Logo
12:04 pm - 3:18 pmSTL-PHX
28h 14m1 stop
$154Frontier
Find Deal
Fri, Dec 5 - Thu, Dec 11
Frontier Logo
7:25 am - 11:24 amPHX-STL
2h 59mnonstop
Frontier Logo
7:45 pm - 7:33 pmSTL-PHX
24h 48m1 stop
$155Frontier
Find Deal
Mon, Nov 10 - Thu, Nov 13
Southwest Logo
4:15 pm - 8:05 pmPHX-STL
2h 50mnonstop
Southwest Logo
5:25 pm - 7:50 pmSTL-PHX
3h 25mnonstop
$159Southwest
Find Deal
Tue, Nov 18 - Wed, Nov 19
American Airlines Logo
8:02 pm - 11:56 pmPHX-STL
2h 54mnonstop
American Airlines Logo
7:38 am - 10:09 amSTL-PHX
3h 31mnonstop
$174American Airlines
Find Deal
Thu, Dec 11 - Sat, Dec 13
American Airlines Logo
7:55 pm - 11:51 pmPHX-STL
2h 56mnonstop
American Airlines Logo
2:29 pm - 5:05 pmSTL-PHX
3h 36mnonstop
$186American Airlines
Find Deal
Tue, Nov 11 - Tue, Nov 18
Southwest Logo
6:30 am - 10:20 amPHX-STL
2h 50mnonstop
Southwest Logo
8:15 pm - 10:40 pmSTL-PHX
3h 25mnonstop
$213Southwest
Find Deal
Fri, Nov 14 - Mon, Nov 17
Delta Logo
12:59 am - 9:10 amPHX-STL
7h 11m1 stop
Delta Logo
9:00 am - 2:00 pmSTL-PHX
6h 00m1 stop
$217Delta
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Mon, Dec 1 - Tue, Dec 9
Delta Logo
12:59 am - 8:55 amPHX-STL
6h 56m1 stop
Delta Logo
6:34 am - 1:08 pmSTL-PHX
7h 34m1 stop
$223Delta
Find Deal
Mon, Nov 10 - Tue, Nov 18

Frontier flights from Phoenix to St. Louis

Our best Frontier deals on Phoenix to St. Louis flight tickets
Frontier
Dec 3
PHX7:43 pmPhoenix Sky Harbor Intl
15h 29m
1 stop
STL12:12 pmLambert-St Louis
Dec 5
STL12:07 pmLambert-St Louis
3h 31m
PHX2:38 pmPhoenix Sky Harbor Intl
$148
Find similar
Frontier
Nov 17
PHX10:53 pmPhoenix Sky Harbor Intl
9h 14m
1 stop
STL9:07 amLambert-St Louis
Nov 19
STL7:24 pmLambert-St Louis
28h 47m
1 stop
PHX11:11 pmPhoenix Sky Harbor Intl
$150
Find similar
Frontier
Dec 5
PHX7:25 amPhoenix Sky Harbor Intl
2h 57m
STL11:22 amLambert-St Louis
Dec 11
STL12:04 pmLambert-St Louis
28h 14m
1 stop
PHX3:18 pmPhoenix Sky Harbor Intl
$154
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 11
PHX8:02 pmPhoenix Sky Harbor Intl
2h 54m
STL11:56 pmLambert-St Louis
Dec 13
STL7:38 amLambert-St Louis
3h 31m
PHX10:09 amPhoenix Sky Harbor Intl
$174
Find similar
American Airlines
Nov 11
PHX7:55 pmPhoenix Sky Harbor Intl
2h 56m
STL11:51 pmLambert-St Louis
Nov 18
STL2:29 pmLambert-St Louis
3h 36m
PHX5:05 pmPhoenix Sky Harbor Intl
$186
Find similar
American Airlines
Nov 11
PHX7:55 pmPhoenix Sky Harbor Intl
2h 56m
STL11:51 pmLambert-St Louis
Nov 15
STL2:29 pmLambert-St Louis
3h 36m
PHX5:05 pmPhoenix Sky Harbor Intl
$209
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 October 29, 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 12/3

7:43 pm-12:12 pm

1 stop15h 29m

Lambert-St Louis

Fri 12/5

12:07 pm-2:38 pm

Nonstop3h 31m

$148

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Mon 11/17

10:53 pm-9:07 am

1 stop9h 14m

Lambert-St Louis

Wed 11/19

7:24 pm-11:11 pm

1 stop28h 47m

$150

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Fri 12/5

7:25 am-11:22 am

Nonstop2h 57m

Lambert-St Louis

Thu 12/11

12:04 pm-3:18 pm

1 stop28h 14m

$154

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Mon 11/10

7:25 am-11:24 am

Nonstop2h 59m

Lambert-St Louis

Thu 11/13

7:45 pm-7:33 pm

1 stop24h 48m

$155

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Tue 11/18

4:15 pm-8:05 pm

Nonstop2h 50m

Lambert-St Louis

Wed 11/19

5:25 pm-7:50 pm

Nonstop3h 25m

$159

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Thu 12/11

8:02 pm-11:56 pm

Nonstop2h 54m

Lambert-St Louis

Sat 12/13

7:38 am-10:09 am

Nonstop3h 31m

$174

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Tue 11/11

7:55 pm-11:51 pm

Nonstop2h 56m

Lambert-St Louis

Tue 11/18

2:29 pm-5:05 pm

Nonstop3h 36m

$186

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Fri 11/14

6:30 am-10:20 am

Nonstop2h 50m

Lambert-St Louis

Mon 11/17

8:15 pm-10:40 pm

Nonstop3h 25m

$213

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Mon 12/1

12:59 am-9:10 am

1 stop7h 11m

Lambert-St Louis

Tue 12/9

9:00 am-2:00 pm

1 stop6h 00m

$217

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Mon 11/10

12:59 am-8:55 am

1 stop6h 56m

Lambert-St Louis

Tue 11/18

6:34 am-1:08 pm

1 stop7h 34m

$223

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, 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 $347.

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 $374. 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 $449. 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 $422 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 $393 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 $342 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 45m

Direct flights

Every day

Airports in St. Louis

1 airport
The fastest flight from Phoenix to St. Louis takes 2h 45m
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 50m, 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
3,124 reviews
Search Frontier flights
United AirlinesPriceFrom $198Free CancellationRating
7.4
8,999 reviews
Search United Airlines flights
American AirlinesPriceFrom $256Free CancellationRating
7.2
11,032 reviews
Search American Airlines flights
DeltaPriceFrom $259Free CancellationRating
7.9
7,992 reviews
Search Delta flights
SouthwestPriceFrom $277Free CancellationRating
8.0
4,241 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
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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