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Cheap flights from Phoenix Sky Harbor Intl Airport to St. Louis from $78

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 Sky Harbor Intl Airport to St. Louis departing on 3/25. 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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Find the cheapest flights from Phoenix Sky Harbor Intl Airport to St. Louis

Cheap round-trip flights

These are some of the best round-trip flight deals from Phoenix Sky Harbor Intl Airport to St. Louis that have been recently found on momondo from popular airlines, departing in the coming months.
2:05 pm - 12:16 pmPHX-STL
20h 11m1 stop
6:51 pm - 11:57 pmSTL-PHX
7h 06m1 stop
$144Frontier
Find Deal
mié., abr. 9 - mié., abr. 16
11:24 pm - 11:46 pmPHX-STL
22h 22m1 stop
6:51 pm - 3:54 pmSTL-PHX
23h 03m1 stop
$152Frontier
Find Deal
lun., abr. 7 - mié., abr. 9
6:54 pm - 11:50 pmPHX-STL
2h 56mnonstop
2:24 pm - 3:55 pmSTL-PHX
3h 31mnonstop
$351American Airlines
Find Deal
lun., abr. 7 - mié., abr. 9
12:25 pm - 5:23 pmPHX-STL
2h 58mnonstop
7:33 am - 9:00 amSTL-PHX
3h 27mnonstop
$355American Airlines
Find Deal
dom., abr. 20 - lun., abr. 21
5:05 pm - 10:00 pmPHX-STL
2h 55mnonstop
10:55 am - 1:20 pmSTL-PHX
4h 25m1 stop
$357Southwest
Find Deal
mar., abr. 8 - mar., abr. 15
6:30 am - 11:25 amPHX-STL
2h 55mnonstop
8:45 pm - 9:55 pmSTL-PHX
3h 10mnonstop
$370Southwest
Find Deal
mié., may. 28 - mié., jul. 16
12:45 am - 10:37 amPHX-STL
7h 52m1 stop
8:55 am - 12:16 pmSTL-PHX
5h 21m1 stop
$371Delta
Find Deal
mar., jun. 3 - mar., jun. 10
12:45 am - 10:37 amPHX-STL
7h 52m1 stop
6:00 am - 10:17 amSTL-PHX
6h 17m1 stop
$375Delta
Find Deal
mié., may. 21 - dom., may. 25
2:27 pm - 10:07 pmPHX-STL
5h 40m1 stop
7:00 am - 1:07 pmSTL-PHX
8h 07m1 stop
$416United Airlines
Find Deal
mié., mar. 26 - jue., mar. 27
6:00 am - 3:47 pmPHX-STL
7h 47m2 stops
4:45 pm - 9:34 pmSTL-PHX
6h 49m1 stop
$450United Airlines
Find Deal
sáb., abr. 12 - dom., abr. 13

Frontier flights from Phoenix Sky Harbor Intl Airport to St. Louis

Our best Frontier deals on Phoenix Sky Harbor Intl Airport to St. Louis flight tickets
Frontier
Apr 9
PHX2:05 pmPhoenix Sky Harbor Intl
20h 11m
1 stop
STL12:16 pmLambert-St Louis
Apr 16
STL6:51 pmLambert-St Louis
7h 06m
1 stop
PHX11:57 pmPhoenix Sky Harbor Intl
Frontier
Apr 7
PHX11:24 pmPhoenix Sky Harbor Intl
22h 22m
1 stop
STL11:46 pmLambert-St Louis
Apr 9
STL6:51 pmLambert-St Louis
23h 03m
1 stop
PHX3:54 pmPhoenix Sky Harbor Intl
Frontier
Apr 1
PHX11:59 pmPhoenix Sky Harbor Intl
21h 47m
1 stop
STL11:46 pmLambert-St Louis
Apr 5
STL6:51 pmLambert-St Louis
7h 06m
1 stop
PHX11:57 pmPhoenix Sky Harbor Intl

Southwest flights from Phoenix Sky Harbor Intl Airport to St. Louis

Our best Southwest deals on Phoenix Sky Harbor Intl Airport to St. Louis flight tickets
Southwest
Apr 8
PHX5:05 pmPhoenix Sky Harbor Intl
2h 55m
STL10:00 pmLambert-St Louis
Apr 15
STL10:55 amLambert-St Louis
4h 25m
1 stop
PHX1:20 pmPhoenix Sky Harbor Intl
Southwest
May 28
PHX6:30 amPhoenix Sky Harbor Intl
2h 55m
STL11:25 amLambert-St Louis
Jul 16
STL8:45 pmLambert-St Louis
3h 10m
PHX9:55 pmPhoenix Sky Harbor Intl
Southwest
Mar 27
PHX7:50 pmPhoenix Sky Harbor Intl
2h 50m
STL12:40 amLambert-St Louis
Apr 22
STL10:55 amLambert-St Louis
4h 25m
1 stop
PHX1:20 pmPhoenix Sky Harbor Intl

See travel insights to St. Louis from

How to get the cheapest flight ticket from Phoenix Sky Harbor Intl Airport 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, June is the cheapest month to fly from Phoenix Sky Harbor Intl Airport to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $226. The month of July is another great option to travel to St. Louis, with average flight prices from Phoenix Sky Harbor Intl Airport averaging around $226.

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 Wednesday when prices can be found for as low as $280. 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 Sky Harbor Intl Airport in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $236 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 $520 per ticket.

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

Fly from Phoenix Sky Harbor Intl to Lambert-St Louis for the best Phoenix Sky Harbor Intl - 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 Sky Harbor Intl Airport when booking 4 weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $329 when searching 4 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from Phoenix Sky Harbor Intl Airport for as low as $244 on momondo.

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

There are 3 cabin classes available to choose from on Phoenix Sky Harbor Intl 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.

How have Phoenix Sky Harbor Intl Airport to St. Louis flight prices changed over time?

As of March 2025, prices for Phoenix Sky Harbor Intl Airport to St. Louis flights are approximately 22% more expensive when compared to flights at the same time last year.

When to book flights from Phoenix Sky Harbor Intl Airport to St. Louis

Are you open to changing your travel dates? Check out the ideal times to fly from Phoenix Sky Harbor Intl Airport to St. Louis according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Phoenix Sky Harbor Intl Airport to St. Louis (PHX to STL) flight deals and tips

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

Best Price Found

$78

Fastest flight time

2h 50m

Direct flights

Every day

Airports in St. Louis

1 airport
The best one-way flight to St. Louis from Phoenix Sky Harbor Intl Airport in the past 72 hours is $78. The best round-trip flight deal from Phoenix Sky Harbor Intl Airport to St. Louis found on momondo in the last 72 hours is $144.
The fastest flight from Phoenix Sky Harbor Intl Airport to St. Louis takes 2h 50m
Direct flights go from Phoenix Sky Harbor Intl Airport to St. Louis every day.
There is 1 airport near St. Louis: Lambert-St Louis (STL)

  • How far is Phoenix Sky Harbor Intl to Lambert-St Louis by plane?

    The straight-line distance from Phoenix Sky Harbor Intl to Lambert-St Louis is 1265.4 mi. 2h 50m is a normal flight duration for this route.

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

    Prices for flights from Phoenix Sky Harbor Intl Airport to Lambert-St Louis Airport refresh daily.

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

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

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Phoenix Sky Harbor Intl Airport 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.

  • What is the most popular plane model from Phoenix Sky Harbor Intl Airport to St. Louis?

  • What is the most popular airline from Phoenix Sky Harbor Intl Airport to St. Louis?


Best airlines flying from Phoenix Sky Harbor Intl Airport to St. Louis

Compare and see reviews for airlines that fly from Phoenix Sky Harbor Intl Airport to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $78Free CancellationRating
6.0
3,292 reviews
Search Frontier flights
American AirlinesPriceFrom $131Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
DeltaPriceFrom $216Free CancellationRating
8.0
7,944 reviews
Search Delta flights
United AirlinesPriceFrom $263Free CancellationRating
7.4
8,623 reviews
Search United Airlines flights
SouthwestPriceFrom $301Free CancellationRating
8.0
4,292 reviews
Search Southwest flights
  • Southwest Flights From Phoenix Sky Harbor Intl Airport to St. Louis

    Across 24 Southwest flights from Phoenix Sky Harbor Intl Airport to St. Louis this week, the average price was $447, with the best Southwest deals starting from $301 round-trip. 4,292 users have rated Southwest on momondo, with an average score of 8.0/10.

  • American Airlines Flights From Phoenix Sky Harbor Intl Airport to St. Louis

    $131 is the best American Airlines flight deal from Phoenix Sky Harbor Intl Airport to St. Louis found on momondo over the last 72 hours. The average American Airlines ticket price found was closer to $324, however, with flight time and availability significantly affecting the price. American Airlines (7.2/10 from 10,000 user reviews) flies into St. Louis from Phoenix Sky Harbor Intl Airport 13 times in an average week so prices can vary.


Traveling to a place near St. Louis?

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

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?

momondo does allow users to show only those flights to St. Louis from Phoenix which offer a flexible booking policy as well as other useful filters and features.

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

momondo helps you find the best flight between Phoenix and St. Louis 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 Phoenix to St. Louis right now. Can momondo alert me if prices change?

If you are not ready to book a flight from Phoenix to St. Louis now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to St. Louis and let you know when they change.


An easier way to manage your St. Louis trip

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mar. 3/18
mar. 3/25

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