Latest deals
Insights
FAQs
Reviews
Price Alerts

Cheap flights from St. Louis to Phoenix from $88

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 departing on 4/17. 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 St. Louis to Phoenix

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
8:17 pm - 8:01 am
STL
-
PHX
13h 44m
1 stop
Frontier Logo
5:15 am - 7:23 pm
PHX
-
STL
12h 08m
1 stop
$167Frontier
Mon, May 4 - Sat, May 9
Frontier Logo
8:17 pm - 8:01 am
STL
-
PHX
13h 44m
1 stop
Frontier Logo
6:53 pm - 7:23 pm
PHX
-
STL
22h 30m
1 stop
$173Frontier
Mon, May 4 - Wed, May 6
Frontier Logo
8:17 pm - 10:11 am
STL
-
PHX
39h 54m
2 stops
Frontier Logo
5:15 am - 7:23 pm
PHX
-
STL
12h 08m
1 stop
$180Frontier
Sat, May 2 - Sat, May 9
Frontier Logo
6:41 pm - 8:33 pm
STL
-
PHX
27h 52m
1 stop
Frontier Logo
5:15 am - 7:23 pm
PHX
-
STL
12h 08m
1 stop
$188Frontier
Tue, May 5 - Sat, May 9
Frontier Logo
8:17 pm - 10:11 am
STL
-
PHX
39h 54m
2 stops
Frontier Logo
5:15 am - 7:23 pm
PHX
-
STL
12h 08m
1 stop
$189Frontier
Sat, May 2 - Sat, May 9
Frontier Logo
8:17 pm - 11:45 am
STL
-
PHX
17h 28m
1 stop
Frontier Logo
5:16 am - 2:36 pm
PHX
-
STL
7h 20m
1 stop
$190Frontier
Mon, Apr 27 - Mon, May 4
Frontier Logo
8:17 pm - 7:36 am
STL
-
PHX
13h 19m
1 stop
Frontier Logo
5:15 am - 7:23 pm
PHX
-
STL
12h 08m
1 stop
$192Frontier
Sat, May 2 - Sat, May 9
Frontier Logo
8:17 pm - 8:01 am
STL
-
PHX
13h 44m
1 stop
Frontier Logo
11:30 pm - 8:55 am
PHX
-
STL
7h 25m
1 stop
$194Frontier
Mon, May 4 - Tue, May 5
Frontier Logo
8:17 pm - 10:11 am
STL
-
PHX
39h 54m
2 stops
Frontier Logo
9:52 am - 7:32 pm
PHX
-
STL
7h 40m
1 stop
$195Frontier
Sat, Apr 25 - Sat, May 2
Frontier Logo
8:17 pm - 8:01 am
STL
-
PHX
13h 44m
1 stop
Frontier Logo
8:40 am - 7:23 pm
PHX
-
STL
8h 43m
1 stop
$196Frontier
Mon, May 4 - Thu, May 7

Frontier flights from St. Louis to Phoenix

Our best Frontier deals on St. Louis to Phoenix flight tickets
Frontier
May 2
STL8:17 pmLambert-St Louis
39h 54m
2 stops
PHX10:11 amPhoenix Sky Harbor Intl
May 9
PHX5:15 amPhoenix Sky Harbor Intl
12h 08m
1 stop
STL7:23 pmLambert-St Louis
$189
Frontier
Apr 27
STL8:17 pmLambert-St Louis
17h 28m
1 stop
PHX11:45 amPhoenix Sky Harbor Intl
May 4
PHX5:16 amPhoenix Sky Harbor Intl
7h 20m
1 stop
STL2:36 pmLambert-St Louis
$190
Frontier
May 2
STL8:17 pmLambert-St Louis
13h 19m
1 stop
PHX7:36 amPhoenix Sky Harbor Intl
May 9
PHX5:15 amPhoenix Sky Harbor Intl
12h 08m
1 stop
STL7:23 pmLambert-St Louis
$192

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Phoenix 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 March 18, 2026.
Use the filters below to find and compare flights from St. Louis to Phoenix that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Mon 5/4

8:17 pm-8:01 am

1 stop13h 44m

Phoenix Sky Harbor Intl

Sat 5/9

5:15 am-7:23 pm

1 stop12h 08m

$167

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Mon 5/4

8:17 pm-8:01 am

1 stop13h 44m

Phoenix Sky Harbor Intl

Wed 5/6

6:53 pm-7:23 pm

1 stop22h 30m

$173

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sat 5/2

8:17 pm-10:11 am

2 stops39h 54m

Phoenix Sky Harbor Intl

Sat 5/9

5:15 am-7:23 pm

1 stop12h 08m

$180

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Tue 5/5

6:41 pm-8:33 pm

1 stop27h 52m

Phoenix Sky Harbor Intl

Sat 5/9

5:15 am-7:23 pm

1 stop12h 08m

$188

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sat 5/2

8:17 pm-10:11 am

2 stops39h 54m

Phoenix Sky Harbor Intl

Sat 5/9

5:15 am-7:23 pm

1 stop12h 08m

$189

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Mon 4/27

8:17 pm-11:45 am

1 stop17h 28m

Phoenix Sky Harbor Intl

Mon 5/4

5:16 am-2:36 pm

1 stop7h 20m

$190

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sat 5/2

8:17 pm-7:36 am

1 stop13h 19m

Phoenix Sky Harbor Intl

Sat 5/9

5:15 am-7:23 pm

1 stop12h 08m

$192
Quickest round-trip

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Mon 5/4

8:17 pm-8:01 am

1 stop13h 44m

Phoenix Sky Harbor Intl

Tue 5/5

11:30 pm-8:55 am

1 stop7h 25m

$194

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Sat 4/25

8:17 pm-10:11 am

2 stops39h 54m

Phoenix Sky Harbor Intl

Sat 5/2

9:52 am-7:32 pm

1 stop7h 40m

$195

St. LouisPhoenix

STL - PHX

STLPHX

Lambert-St Louis

Mon 5/4

8:17 pm-8:01 am

1 stop13h 44m

Phoenix Sky Harbor Intl

Thu 5/7

8:40 am-7:23 pm

1 stop8h 43m

$196

Flights are sorted by cheapest round-trip flights first.

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

See travel insights to Phoenix from

How to get the cheapest flight ticket from St. Louis to Phoenix

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?

If you are unable to visit Phoenix during the month of November, then departing from St. Louis during the month October is also very affordable. Most momondo users find prices during this month for around $311.

What is the cheapest day to depart on your flight to Phoenix?

On average, the least expensive day to fly to Phoenix from St. Louis is on a Wednesday. momondo users have found tickets for Wednesday departures for as low as $371. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Sunday is the most expensive day to depart from St. Louis because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $444.

What is the cheapest time of day to depart on your flight to Phoenix?

The cheapest time of day to fly to Phoenix is in the evening when flights can be purchased for as low as $300. In the morning is when there is more demand to fly to Phoenix, so prices are often more expensive at around $430 per ticket.

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

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

How far in advance should I book a flight to Phoenix?

You are more likely to see cheaper flights to Phoenix from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Phoenix for around $348 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Phoenix from St. Louis for as low as $296 on momondo.

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

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

Cheap St. Louis to Phoenix flight deals and tips

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

Fastest flight time

3h 10m

Direct flights

Every day

Airports in Phoenix

3 airports
The fastest flight from St. Louis to Phoenix takes 3h 10m
Direct flights go from St. Louis to Phoenix every day.
There are 3 airports in Phoenix. From St. Louis there are direct flights to Phoenix Sky Harbor Intl (PHX).
Search flight deals

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

    The distance between Lambert-St Louis and Phoenix is about 1269.1 mi. By plane, this route typically takes 3h 10m.

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

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

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

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

    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.

  • What documentation or ID do you need to fly to Phoenix?

    The travel and health documents you'll need for your trip to Phoenix 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. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Best airlines flying from St. Louis to Phoenix

Compare and see reviews for airlines that fly from St. Louis to Phoenix with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $94Free CancellationRating
5.7
3,025 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $121Free CancellationRating
6.3
8,523 reviews
Search Spirit Airlines flights
DeltaPriceFrom $141Free CancellationRating
7.9
8,287 reviews
Search Delta flights
United AirlinesPriceFrom $148Free CancellationRating
7.4
9,435 reviews
Search United Airlines flights
American AirlinesPriceFrom $209Free CancellationRating
7.1
11,469 reviews
Search American Airlines flights
SouthwestPriceFrom $218Free CancellationRating
8.0
4,320 reviews
Search Southwest flights

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?

Flights from St. Louis to Phoenix with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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

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

Of course. momondo tracks the price of St. Louis to Phoenix flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

An easier way to manage your Phoenix 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 4/17
Fri 4/24
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States

Fly into one of these airports located in Phoenix

Airports listed have a maximum distance of 25.4 mi from Phoenix
Phoenix-Mesa Gateway Airport