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Cheap flights from St. Louis to Phoenix Sky Harbor Intl Airport from $90

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Phoenix Sky Harbor Intl Airport departing on 4/30. 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 St. Louis to Phoenix

Cheap round-trip flights

KAYAK's recommended round-trip deals from the most popular airlines that fly from St. Louis to Phoenix.
Frontier Logo
6:58 pm - 11:58 pmSTL-PHX
7h 00m1 stop
Frontier Logo
7:50 am - 9:05 pmPHX-STL
11h 15m1 stop
$237Frontier
Find Deal
Mon, Apr 28 - Mon, May 5
Frontier Logo
9:55 pm - 6:45 amSTL-PHX
10h 50m1 stop
Frontier Logo
7:50 am - 9:05 pmPHX-STL
11h 15m1 stop
$238Frontier
Find Deal
Thu, May 1 - Mon, May 5
Southwest Logo
8:45 pm - 10:05 pmSTL-PHX
3h 20mnonstop
Southwest Logo
7:40 pm - 12:35 amPHX-STL
2h 55mnonstop
$319Southwest
Find Deal
Sat, May 24 - Fri, May 30
American Airlines Logo
7:33 am - 9:00 amSTL-PHX
3h 27mnonstop
American Airlines Logo
8:39 am - 1:42 pmPHX-STL
3h 03mnonstop
$321American Airlines
Find Deal
Sat, Apr 19 - Tue, Apr 22
Southwest Logo
5:45 am - 7:05 amSTL-PHX
3h 20mnonstop
Southwest Logo
6:40 pm - 11:35 pmPHX-STL
2h 55mnonstop
$323Southwest
Find Deal
Wed, Apr 23 - Tue, Apr 29
American Airlines Logo
7:33 am - 9:00 amSTL-PHX
3h 27mnonstop
American Airlines Logo
10:35 am - 7:29 pmPHX-STL
6h 54m1 stop
$331American Airlines
Find Deal
Sat, Apr 19 - Tue, Apr 22
Delta Logo
2:29 pm - 6:02 pmSTL-PHX
5h 33m1 stop
Delta Logo
12:45 am - 10:47 amPHX-STL
8h 02m1 stop
$339Delta
Find Deal
Wed, May 21 - Mon, May 26
Delta Logo
6:00 am - 10:38 amSTL-PHX
6h 38m1 stop
Delta Logo
5:25 pm - 12:59 amPHX-STL
5h 34m1 stop
$349Delta
Find Deal
Wed, May 7 - Mon, May 19
United Airlines Logo
6:33 am - 12:27 pmSTL-PHX
7h 54m2 stops
United Airlines Logo
7:04 am - 3:47 pmPHX-STL
6h 43m1 stop
$402United Airlines
Find Deal
Tue, Jul 29 - Mon, Aug 11
United Airlines Logo
7:00 am - 1:01 pmSTL-PHX
8h 01m1 stop
United Airlines Logo
9:53 am - 10:03 pmPHX-STL
10h 10m2 stops
$420United Airlines
Find Deal
Sat, May 3 - Tue, May 6

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

Our best Southwest deals on St. Louis to Phoenix Sky Harbor Intl Airport flight tickets
Southwest
May 24
STL8:45 pmLambert-St Louis
3h 20m
PHX10:05 pmPhoenix Sky Harbor Intl
May 30
PHX7:40 pmPhoenix Sky Harbor Intl
2h 55m
STL12:35 amLambert-St Louis
Southwest
Apr 23
STL5:45 amLambert-St Louis
3h 20m
PHX7:05 amPhoenix Sky Harbor Intl
Apr 29
PHX6:40 pmPhoenix Sky Harbor Intl
2h 55m
STL11:35 pmLambert-St Louis
Southwest
May 25
STL11:05 amLambert-St Louis
5h 00m
1 stop
PHX2:05 pmPhoenix Sky Harbor Intl
May 29
PHX7:40 pmPhoenix Sky Harbor Intl
2h 55m
STL12:35 amLambert-St Louis

American Airlines flights from St. Louis to Phoenix Sky Harbor Intl Airport

Our best American Airlines deals on St. Louis to Phoenix Sky Harbor Intl Airport flight tickets
American Airlines
Apr 19
STL7:33 amLambert-St Louis
3h 27m
PHX9:00 amPhoenix Sky Harbor Intl
Apr 22
PHX8:39 amPhoenix Sky Harbor Intl
3h 03m
STL1:42 pmLambert-St Louis
American Airlines
Apr 19
STL7:33 amLambert-St Louis
3h 27m
PHX9:00 amPhoenix Sky Harbor Intl
Apr 22
PHX10:35 amPhoenix Sky Harbor Intl
6h 54m
1 stop
STL7:29 pmLambert-St Louis
American Airlines
Apr 23
STL2:27 pmLambert-St Louis
3h 31m
PHX3:58 pmPhoenix Sky Harbor Intl
Apr 28
PHX1:04 amPhoenix Sky Harbor Intl
6h 18m
1 stop
STL9:22 amLambert-St Louis

See travel insights to Phoenix from

How to get the cheapest flight ticket from St. Louis to Phoenix Sky Harbor Intl Airport

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 Phoenix Sky Harbor Intl Airport?

In general, July is the cheapest month to fly from St. Louis to Phoenix Sky Harbor Intl Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $226. If you are unable to visit Phoenix Sky Harbor Intl Airport during the month of July, then departing from St. Louis during the month May is also very affordable. Most momondo users find prices during this month for around $228.

What is the cheapest day to depart on your flight to Phoenix Sky Harbor Intl Airport?

On average, the least expensive day to fly to Phoenix Sky Harbor Intl Airport from St. Louis is on a Wednesday. momondo users have found tickets for Wednesday departures for as low as $356. However, this price may fluctuate depending on the airline, the season, and holidays. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $495. These prices are subject to change though, so be sure to set up a Price Alert for flights to Phoenix Sky Harbor Intl Airport.

What is the cheapest time of day to depart on your flight to Phoenix Sky Harbor Intl Airport?

In the evening is the cheapest time of day to fly from St. Louis to Phoenix Sky Harbor Intl Airport when you can find flight prices for as low as $266. Flying to Phoenix Sky Harbor Intl Airport in the evening is an ideal time because this is during off-peak travel hours. Try not to purchase tickets in the morning because they tend to be around $446. Of course, these prices can vary depending on the time of year and what airport you fly to.

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

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

How far in advance should I book a flight to Phoenix Sky Harbor Intl Airport?

You are more likely to see cheaper flights to Phoenix Sky Harbor Intl Airport from St. Louis when booking 3 weeks ahead of your departure date. In general, you can expect to find flights to Phoenix Sky Harbor Intl Airport for around $331 when searching 3 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Phoenix Sky Harbor Intl Airport from St. Louis for as low as $291 on momondo.

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

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

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

As of April 2025, prices for St. Louis to Phoenix Sky Harbor Intl Airport flights are approximately 68% cheaper when compared to flights at the same time last year.

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

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

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

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

Best Price Found

$90

Fastest flight time

3h 10m

Direct flights

Every day
The best one-way flight to Phoenix Sky Harbor Intl Airport from St. Louis in the past 72 hours is $90. The best round-trip flight deal from St. Louis to Phoenix Sky Harbor Intl Airport found on momondo in the last 72 hours is $237.
The fastest flight from St. Louis to Phoenix Sky Harbor Intl Airport takes 3h 10m
Direct flights go from St. Louis to Phoenix Sky Harbor Intl Airport every day.

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

    Phoenix Sky Harbor Intl is 1265.4 mi away from Lambert-St Louis. Typically, this will take 3h 10m by plane in normal conditions.

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

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

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

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

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to Phoenix Sky Harbor Intl Airport.

  • What documentation or ID do you need to fly to Phoenix Sky Harbor Intl Airport?

    The travel and health documents you'll need for your trip to Phoenix Sky Harbor Intl Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Phoenix Sky Harbor Intl Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

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

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


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

Compare and see reviews for airlines that fly from St. Louis to Phoenix Sky Harbor Intl Airport with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $77Free CancellationRating
5.9
3,277 reviews
Search Frontier flights
American AirlinesPriceFrom $131Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
DeltaPriceFrom $197Free CancellationRating
8.0
7,899 reviews
Search Delta flights
United AirlinesPriceFrom $226Free CancellationRating
7.4
8,615 reviews
Search United Airlines flights
SouthwestPriceFrom $294Free CancellationRating
8.0
4,275 reviews
Search Southwest flights
  • Southwest Flights From St. Louis to Phoenix Sky Harbor Intl Airport

    Southwest operates around 33 flights from St. Louis to Phoenix Sky Harbor Intl Airport every week. The average price of these flights found in the last 72 hours has been $448, but momondo users have found Southwest deals from St. Louis to Phoenix Sky Harbor Intl Airport from as low as $294 round-trip. Southwest has been scored 8.0/10 in 4,275 reviews.

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

    American Airlines (7.2/10 from 10,000 reviews) operates around 7 flights from St. Louis to Phoenix Sky Harbor Intl Airport in any given week. The average American Airlines airfare for this route is around $353, with deals from around $131 rare but found on momondo. Referenced prices are for round-trip St. Louis to Phoenix Sky Harbor Intl Airport flight searches in the last 72 hours.


Traveling to a place near Phoenix?

Book flights to Phoenix if you plan to visit one of these locations
Scottsdale
Mesa
Tempe
Chandler
Glendale
Gilbert
Surprise
Peoria
Casa Grande
Wickenburg
Apache Junction
Payson
Goodyear
Buckeye
Paradise Valley
Avondale
Camp Verde
Fountain Hills
Cave Creek
Litchfield Park

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from St. Louis to Phoenix. momondo saves you time and could save you money on your trip.

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

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

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

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Phoenix from St. Louis.

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

If you are simply researching potential flights to Phoenix, momondo offers a useful price alert feature which will track prices for flights to Phoenix from St. Louis and alert you when they change.


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