Cheap flights from Phoenix to St Louis

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Flight deals from Phoenix to St Louis

Looking for a cheap last-minute deal or the best round-trip flight from Phoenix to St Louis Airport? If you want to travel next month, round-trip fares start from $239. Find the lowest prices on one-way and round-trip tickets right here.

St Louis.$236 per passenger.Departing Sat, Jul 4, returning Tue, Jul 28.Round-trip flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from Phoenix Sky Harbor on Sat, Jul 4, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departing from St Louis on Tue, Jul 28, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From $236, select.

St Louis.$239 per passenger.Departing Tue, Jun 16, returning Sat, Jun 20.Round-trip flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from Phoenix Sky Harbor on Tue, Jun 16, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departing from St Louis on Sat, Jun 20, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From $239, select.

St Louis.$248 per passenger.Departing Tue, Jun 30, returning Tue, Jul 28.Round-trip flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from Phoenix Sky Harbor on Tue, Jun 30, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departing from St Louis on Tue, Jul 28, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From $248, select.

St Louis.$248 per passenger.Departing Wed, May 27, returning Tue, Jun 2.Round-trip flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from Phoenix Sky Harbor on Wed, May 27, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departing from St Louis on Tue, Jun 2, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From $248, select.

St Louis.$250 per passenger.Departing Sat, Jul 4, returning Sat, Aug 1.Round-trip flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from Phoenix Sky Harbor on Sat, Jul 4, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departing from St Louis on Sat, Aug 1, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From $250, select.

St Louis.$250 per passenger.Departing Thu, Sep 17, returning Sat, Sep 19.Round-trip flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from Phoenix Sky Harbor on Thu, Sep 17, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departing from St Louis on Sat, Sep 19, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From $250, select.

St Louis.$252 per passenger.Departing Thu, Aug 6, returning Sun, Aug 9.Round-trip flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from Phoenix Sky Harbor on Thu, Aug 6, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departing from St Louis on Sun, Aug 9, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From $252, select.

St Louis.$276 per passenger.Departing Wed, May 27, returning Tue, Jun 2.Round-trip flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departing from Phoenix Sky Harbor on Wed, May 27, arriving in St Louis.Inbound direct flight with Southwest Airlines departing from St Louis on Tue, Jun 2, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From $276, select.

St Louis.$277 per passenger.Departing Wed, Sep 16, returning Wed, Sep 23.Round-trip flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departing from Phoenix Sky Harbor on Wed, Sep 16, arriving in St Louis.Inbound direct flight with Southwest Airlines departing from St Louis on Wed, Sep 23, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From $277, select.

St Louis.$277 per passenger.Departing Wed, Jul 8, returning Wed, Jul 15.Round-trip flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departing from Phoenix Sky Harbor on Wed, Jul 8, arriving in St Louis.Inbound direct flight with Southwest Airlines departing from St Louis on Wed, Jul 15, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From $277, select.

St Louis.$290 per passenger.Departing Tue, Jun 30, returning Sun, Aug 2.Round-trip flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departing from Phoenix Sky Harbor on Tue, Jun 30, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departing from St Louis on Sun, Aug 2, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From $290, select.

St Louis.$294 per passenger.Departing Thu, Jun 18, returning Tue, Jun 23.Round-trip flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departing from Phoenix Sky Harbor on Thu, Jun 18, arriving in St Louis.Inbound direct flight with Southwest Airlines departing from St Louis on Tue, Jun 23, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From $294, select.

St Louis.$304 per passenger.Departing Tue, Jun 30, returning Tue, Jul 28.Round-trip flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departing from Phoenix Sky Harbor on Tue, Jun 30, arriving in St Louis.Inbound direct flight with Southwest Airlines departing from St Louis on Tue, Jul 28, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From $304, select.

St Louis.$333 per passenger.Departing Sat, May 30, returning Sun, May 31.Round-trip flight with Delta.Outbound indirect flight with Delta, departing from Phoenix Sky Harbor on Sat, May 30, arriving in St Louis.Inbound indirect flight with Delta, departing from St Louis on Sun, May 31, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From $333, select.

St Louis.$341 per passenger.Departing Fri, Jul 31, returning Mon, Aug 3.Round-trip flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departing from Phoenix Sky Harbor on Fri, Jul 31, arriving in St Louis.Inbound direct flight with Southwest Airlines departing from St Louis on Mon, Aug 3, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From $341, select.

St Louis.$350 per passenger.Departing Thu, Aug 6, returning Sun, Aug 9.Round-trip flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departing from Phoenix Sky Harbor on Thu, Aug 6, arriving in St Louis.Inbound direct flight with Southwest Airlines departing from St Louis on Sun, Aug 9, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From $350, select.

Find the cheapest month to fly from Phoenix to St Louis

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Phoenix to St Louis flights are currently cheapest in July.

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Direct flights from Phoenix to St Louis

Phoenix to St Louis: Alternative routes

Compare routes from Phoenix to St Louis below. You may find an airport to fly into that's cheaper, faster, or easier than St Louis.

Phoenix to St Louis: Flight information

The things to know before you go.

Cheapest flight found	$236
Cheapest month to fly	July
Average flight time	2 hrs, 58 mins
Most popular airline	Southwest Airlines
Average flights per week	67

Finding cheap flights from Phoenix to St Louis: Frequently asked questions

How much are round-trip flights from Phoenix to St Louis?

The best price we found for a round-trip flight from Phoenix to St Louis is $236. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.

How long does it take to fly from Phoenix to St Louis?

2 hours and 58 minutes is the average flight time from Phoenix to St Louis.

Which airlines fly direct from Phoenix to St Louis?

Southwest Airlines, American Airlines and Alaska Airlines fly direct from Phoenix to St Louis.

How many flights are there a week from Phoenix to St Louis?

There are 67 flights per week flying from Phoenix to St Louis, as of May 2026.

When is the cheapest time to fly from Phoenix to St Louis?

The cheapest month to fly from Phoenix to St Louis is usually July.

Which upcoming date is cheapest to fly from Phoenix to St Louis Airport on?

After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Phoenix to St Louis Airport on Saturday, July 4, 2026.

Can I get a direct flight from Phoenix to St Louis Airport?

Yes – the average flight time is 2 hours and 58 minutes.

How can I find the best flight deal to St Louis?

We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to St Louis but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.

When is the best time to book flights to St Louis?

We crunched all the numbers in our flight calendar, and it looks like the cheapest time to book a flight to St Louis is around 40 days in advance, so don’t leave your flight to the last minute.

Flying from Phoenix to St Louis Lambert International Airport (STL): What you need to know

Your journey comes together at Phoenix's main airport, Phoenix Sky Harbor International Airport (PHX). Check out the options for reserving a flight from Phoenix to St Louis Lambert International Airport (STL) departing from this base.
Around 2 hours 55 minutes is how long you can expect to be in the air on a direct Phoenix to St Louis Lambert International Airport flight.
The timezone in St Louis is UTC-6, which is one hour ahead of Phoenix. St Louis Lambert International Airport is located in St Louis.
The busiest route is Phoenix Sky Harbor International Airport (PHX) to St Louis Lambert International Airport (STL). There are 37 direct services each week.
Arriving two hours before an international flight and one hour ahead of a domestic departure are golden rules for stress-free travel. Make sure you're at the airport on time to catch your flight from Phoenix to STL.
If you're going away during a popular month like March, arrive at the terminal even earlier. It's wise to arrive up to four hours before an international flight and two hours ahead of a domestic departure. Security lines will be longer during high seasons like Thanksgiving and Christmas.

Airports in Phoenix

Phoenix Sky Harbor International Airport (PHX)

You can jump on a direct flight from Phoenix to St Louis Lambert International Airport (STL) out of Phoenix Sky Harbor International Airport (PHX).
Well-known airlines that have direct flights from Phoenix to St Louis Lambert International Airport out of PHX include:
Southwest Airlines is the airline most travelers choose for flights from PHX to STL.
Among carriers on this route, Frontier Airlines leads the way for on-time arrivals.
PHX is around 5 kilometers from central Phoenix. If you're driving, ride-sharing or catching a cab from the center, it'll take 10 minutes or so to get there, depending on the traffic. If you're using public transport, expect the travel time to be around 25 minutes.
Have an early flight from Phoenix to St Louis Lambert International Airport? Avoid the mad dash to the terminal (and sneak in some bonus sleep) by staying at one of these stays near Phoenix Sky Harbor International Airport:
Phoenix Sky Harbor International Airport gets high marks for its on-time performance. 80% of flights that depart PHX land on time.
PHX's address is 3400 Sky Harbor Boulevard.

Phoenix-Mesa Gateway Airport (AZA)

AZA is about 32 kilometers from central Phoenix. It'll take you 30 minutes or so to get to the airport if you're driving from the city center. Public transport takes approximately 1 hour 15 minutes.
Flying out early in the morning? You might like to check in to one of these accommodation options near Phoenix-Mesa Gateway Airport the day before your Phoenix to STL flight:
The majority of flights that depart Phoenix-Mesa Gateway Airport arrive at their destination within the expected time frame. It maintains a high on-time performance rate of 82%.
The street address for AZA is 6033 S. Sossaman Rd..

About St Louis Lambert International Airport (STL)

Have a late flight from Phoenix to St Louis Lambert International Airport? Don't let it leave you bleary-eyed. Stay at one of these hotels near STL and hit the pillow fast:
Get the best deal by reserving your ride around one week ahead of your Phoenix to St Louis Lambert International Airport flight.
You'll find STL at 10701 Lambert International Blvd..

Getting from St Louis Lambert International Airport (STL) to central St Louis

Central St Louis is around 24 kilometers from St Louis Lambert International Airport and takes about 25 minutes to reach by car. Look into how to get from the airport to the city, whether that's with a cab, car rental or ride-share.
If you're traveling on public transport, expect a journey of about 30 minutes.

How to find the cheapest flights from Phoenix to St Louis Lambert International Airport (STL)

$87 is currently the lowest price for a one-way ticket from Phoenix to St Louis Lambert International Airport. Return flights start at $236. These fares may change depending on demand and availability.
Don't leave things to the last minute. You're more likely to find cheap flights from Phoenix to STL if you book ahead. Airlines often have some great early bird discounts.
If you have some flexibility with your travel plans, use the 'Whole month' tool. It'll show you the cheapest price across every month when searching for your Phoenix to St Louis Lambert International Airport ticket.
Finding a cheap plane ticket from Phoenix to STL is easy with Price Alerts. All you need to do is create one of these automatic alerts and we'll get in touch when the price has dropped.
Hunt for savings on a flight from Phoenix to St Louis Lambert International Airport with the help of the filters. Pick your ideal arrival and departure times, airlines and number of stops. You can also sort your results by 'Cheapest,' 'Fastest' or 'Best.'

The best time to fly from Phoenix to St Louis Lambert International Airport (STL)

Think about the kind of vacation you want when deciding when to fly. December is the quietest month to go to St Louis. July is when most people book flights from Phoenix to St Louis Lambert International Airport (STL), which may be perfect if you're chasing more excitement.
The warmest month in St Louis is July, with temperatures ranging between 17ºC (63ºF) and 33ºC (91ºF). Book your Phoenix to STL plane ticket then if that's your idea of comfortable weather.
Look for cheap tickets from Phoenix to St Louis Lambert International Airport in January if you'd rather travel when it's cooler. Temperatures are at their lowest then, ranging between -7ºC (19ºF) and 8ºC (46ºF).

More about St Louis

Start your St Louis trip off on the right foot by choosing the ideal place to stay. After booking your flight from Phoenix to St Louis Lambert International Airport, browse our selection of accommodation options including:
Your visit to St Louis wouldn't be complete without a bit of sightseeing. Leading attractions that are worth your time include The Gateway Arch, Saint Louis Arch and Museum at the Gateway Arch.

Explore more of the United States

St Louis is easy to fall in love with, but there are so many other corners of the United States you'll want to see. Around 257 kilometers east of St Louis, a visit to Evansville will keep you busy. Check out popular attractions like Mesker Park Zoo, Riverfront Park and Evansville Museum of Arts, History & Science.
If you're ready to explore another great destination in the United States, head for Columbia, about 177 kilometers west of St Louis. Museum of Art and Archaeology, Mizzou Botanic Garden and Francis Quadrangle are key highlights.