Cheap Flights from Phoenix to St Louis from $222

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Flight deals from Phoenix to St Louis

Looking for a cheap last-minute deal or the best return flight from Phoenix to St Louis? Find the lowest prices on one-way and return tickets right here.

St Louis.$222 per passenger.Departing Wed, 18 Feb, returning Wed, 25 Feb.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Phoenix Sky Harbor on Wed, 18 Feb, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Wed, 25 Feb, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From $222, select.

St Louis.$303 per passenger.Departing Fri, 23 Jan, returning Sun, 25 Jan.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Phoenix Sky Harbor on Fri, 23 Jan, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Sun, 25 Jan, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From $303, select.

St Louis.$311 per passenger.Departing Thu, 29 Jan, returning Sun, 1 Feb.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Phoenix Sky Harbor on Thu, 29 Jan, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Sun, 1 Feb, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From $311, select.

St Louis.$361 per passenger.Departing Fri, 6 Feb, returning Sun, 8 Feb.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Phoenix Sky Harbor on Fri, 6 Feb, arriving in St Louis.Inbound direct flight with Frontier Airlines departs from St Louis on Sun, 8 Feb, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From $361, select.

St Louis.$388 per passenger.Departing Thu, 5 Mar, returning Sun, 8 Mar.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Phoenix Sky Harbor on Thu, 5 Mar, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Sun, 8 Mar, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From $388, select.

St Louis.$394 per passenger.Departing Thu, 12 Mar, returning Sun, 15 Mar.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Phoenix Sky Harbor on Thu, 12 Mar, arriving in St Louis.Inbound direct flight with Frontier Airlines departs from St Louis on Sun, 15 Mar, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From $394, select.

St Louis.$398 per passenger.Departing Fri, 23 Jan, returning Sun, 25 Jan.Return flight with Frontier Airlines.Outbound direct flight with Frontier Airlines departs from Phoenix Sky Harbor on Fri, 23 Jan, arriving in St Louis.Inbound direct flight with Frontier Airlines departs from St Louis on Sun, 25 Jan, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From $398, select.

St Louis.$475 per passenger.Departing Thu, 26 Mar, returning Mon, 6 Apr.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Phoenix Sky Harbor on Thu, 26 Mar, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Mon, 6 Apr, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From $475, 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 February.

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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	$222
Cheapest month to fly	February
Average flight time	2 hrs, 55 mins
Most popular airline	Southwest Airlines
Average flights per week	81

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

How much are return flights from Phoenix to St Louis?

The best price we found for a return flight from Phoenix to St Louis is $222. 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 55 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?

As of January 2026, there are 81 flights per week flying from Phoenix to St Louis.

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

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

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 Wednesday, 18 February 2026.

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

Yes – the average flight time is 2 hours and 55 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.

Which is the cheapest airline to fly from Phoenix to St Louis with?

The cheapest airline that flies to St Louis is Frontier Airlines .

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

The first chapter of your trip begins at one of Phoenix's main airports, Phoenix Sky Harbour International Airport (PHX) or Phoenix-Mesa Gateway Airport (AZA). Explore your options for booking a flight from Phoenix to Lambert-St. Louis International Airport (STL) leaving from either of these.
St Louis is two hours ahead of Phoenix. Lambert-St. Louis International Airport is located in St Louis, which follows the UTC-5 timezone.
Your flight from Phoenix to STL won't wait if you're late, so show up at the airport on time. Arrive up to one hour in advance for domestic flights and two hours ahead when you're flying internationally.
If you're flying during a bank holiday or other peak period, give yourself extra time. Get there two hours ahead of domestic flights and up to four hours before international departures. Lines at security and check-in will be longer.

Airports in Phoenix

Phoenix Scottsdale Municipal Airport (SCF)

Located around 32 kilometres from central Phoenix, SCF can be reached in about 35 minutes by car (depending on traffic). The journey on public transport is roughly 1 hour 55 minutes.
In search of a convenient hotel near Phoenix Scottsdale Municipal Airport? If you've booked an early flight from Phoenix to Lambert-St. Louis International Airport, these stays will have you sleeping just around the corner from the terminal:

Phoenix Sky Harbour International Airport (PHX)

You can book a direct Phoenix to Lambert-St. Louis International Airport (STL) flight ticket out of Phoenix Sky Harbour International Airport (PHX). See if flying from PHX works better for your plans.
Southwest Airlines has direct flights from Phoenix to STL departing from PHX. Book your favourite aisle (or window) seat and arrive at your destination in one go.
Southwest Airlines is the top choice for bookings on the PHX to STL route.
Southwest Airlines is the most consistently on-time carrier operating flights between Phoenix Sky Harbour International Airport and Lambert-St. Louis International Airport.
Using public transport, you can travel from central Phoenix to PHX in about 35 minutes. The airport is roughly 8 kilometres away, and getting there by car will take approximately 10 minutes.
Want to treat yourself to an extra night away before catching your Phoenix to STL flight? Unwind in a hotel near Phoenix Sky Harbour International Airport before your holiday officially begins. These stays have a room with your name on it:
Most flights that depart Phoenix Sky Harbour International Airport touch down at their destination within the expected time frame. It maintains a strong on-time performance rate of 82.57%.
You'll find PHX at 3400 Sky Harbour Boulevard.

Phoenix-Mesa Gateway Airport (AZA)

Planning to travel to AZA from the centre of Phoenix? The airport is around 56 kilometres away, and getting there takes about 40 minutes by car.
Make catching an early Phoenix to Lambert-St. Louis International Airport flight the easiest part of your journey. Stay at one of these hotels close to Phoenix-Mesa Gateway Airport and get to the check-in counter with plenty of time to spare:
Airports have an on-time performance rating that monitors how often flights touch down without delays. At AZA, that figure is 78.65%.
Phoenix-Mesa Gateway Airport is located at 6033 S. Sossaman Rd..

About Lambert-St. Louis International Airport (STL)

Have a late flight from Phoenix to Lambert-St. Louis International Airport? Don't let it stretch your travel day into tomorrow. Stay at one of these hotels near STL and fast-forward to bedtime:
Follow your own route with a Lambert-St. Louis International Airport rental car. Pick up your wheels from Hertz, Budget or Alamo and chase adventure across St Louis and beyond.
Lock in the lowest price by booking your vehicle around one week before your Phoenix to Lambert-St. Louis International Airport flight.
STL is located at 10701 Lambert International Blvd..

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

Lambert-St. Louis International Airport to the centre of St Louis is around 16 kilometres. If you're getting a cab or renting a car, do a little research to make your trip as smooth as possible. Journey times will vary depending on traffic and the time of day.
If you're using public transport, expect a journey of roughly 35 minutes.

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

At the moment, $110 is the best price we've found for a one-way ticket from Phoenix to Lambert-St. Louis International Airport. The cheapest price for a return flight is $222. Keep in mind fares may change due to availability at the time of booking.
Booking early is often the key to finding a cheap flight from Phoenix to STL. Fares tend to rise as demand increases, so the closer you get to departure, the more expensive your ticket may be.
Affordable Phoenix to Lambert-St. Louis International Airport tickets are easier to find when your travel dates are flexible. Try using the 'Whole month' search function to compare fares throughout the month and then fly out on the cheapest day.
Be the first to know about deals for flight tickets from Phoenix to STL by creating a Price Alert. We'll send you an email or notification through the app when prices go down.
Hunt for savings on a flight from Phoenix to Lambert-St. Louis International Airport with the help of the filters. Choose your ideal departure and arrival times, number of stops and airlines. You can also sort your results by 'Fastest,' 'Best' or 'Cheapest.'

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

It's time to work out your travel dates for your flight from Phoenix to Lambert-St. Louis International Airport (STL). July is the busiest month to travel to St Louis. If you prefer a quieter vibe, go in April.
Lock in a Phoenix to STL flight ticket departing in July if you're eager to explore the city during its warmest month. Expect temperatures in St Louis to range from 17ºC to 33ºC.
Look for cheap tickets from Phoenix to Lambert-St. Louis International Airport in January if you want to travel in cooler conditions. Temperatures are at their lowest then, ranging between -8ºC and 7ºC.

More about St Louis

After booking your flight from Phoenix to Lambert-St. Louis International Airport, find a hotel that offers a good mix of location and comfort. Make one of these options your base for exploring St Louis:
Your St Louis visit won't be complete without checking out the sights. Leading attractions that should be on your list include The Gateway Arch, Saint Louis Arch and Museum at the Gateway Arch.

Explore more of the United States

St Louis is always a good idea, but there are so many other parts of the United States you'll want to see. Around 257 kilometres east of St Louis, a trip to Evansville will keep your itinerary busy. Don't miss top attractions like Mesker Park Zoo, Riverfront Park and Evansville Zoological Society.
If you're eager to discover another corner of the United States, head for Columbia, roughly 177 kilometres west of St Louis. Sentinel Park, Museum of Art and Archaeology and Bur Oak Brewing Company are among its highlights.