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153 € Cheap Flights from Phoenix Sky Harbor to St Louis

Compare Phoenix Sky Harbor to St Louis flight deals

Find the cheapest month or even day of the year to fly to St Louis

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Flight deals from Phoenix Sky Harbor to St Louis

Looking for a cheap last-minute deal or the best return flight from Phoenix Sky Harbor Airport to St Louis Airport? If you want to travel next month, return fares start from 195 €. Find the lowest prices on one-way and return tickets right here.
St Louis.153 € per passenger.Departing Wed, 5 Aug, returning Sun, 9 Aug.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Phoenix Sky Harbor on Wed, 5 Aug, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Sun, 9 Aug, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From 153 €, select.
St Louis.161 € per passenger.Departing Wed, 29 Jul, returning Wed, 5 Aug.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Phoenix Sky Harbor on Wed, 29 Jul, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Wed, 5 Aug, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From 161 €, select.
St Louis.195 € per passenger.Departing Wed, 15 Jul, returning Wed, 29 Jul.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Phoenix Sky Harbor on Wed, 15 Jul, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Wed, 29 Jul, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From 195 €, select.
St Louis.209 € per passenger.Departing Tue, 8 Sep, returning Sat, 12 Sep.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Phoenix Sky Harbor on Tue, 8 Sep, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Sat, 12 Sep, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From 209 €, select.
St Louis.220 € per passenger.Departing Wed, 23 Sep, returning Mon, 5 Oct.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Phoenix Sky Harbor on Wed, 23 Sep, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Mon, 5 Oct, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From 220 €, select.
St Louis.227 € per passenger.Departing Wed, 14 Oct, returning Sat, 17 Oct.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Phoenix Sky Harbor on Wed, 14 Oct, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Sat, 17 Oct, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From 227 €, select.
St Louis.235 € per passenger.Departing Sun, 23 Aug, returning Wed, 2 Sep.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Phoenix Sky Harbor on Sun, 23 Aug, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Wed, 2 Sep, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From 235 €, select.
St Louis.293 € per passenger.Departing Sat, 27 Jun, returning Sat, 4 Jul.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Phoenix Sky Harbor on Sat, 27 Jun, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Sat, 4 Jul, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From 293 €, select.
St Louis.295 € per passenger.Departing Wed, 16 Sep, returning Wed, 23 Sep.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Phoenix Sky Harbor on Wed, 16 Sep, arriving in St Louis.Inbound direct flight with Southwest Airlines departs from St Louis on Wed, 23 Sep, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From 295 €, select.
St Louis.307 € per passenger.Departing Tue, 23 Jun, returning Thu, 25 Jun.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Phoenix Sky Harbor on Tue, 23 Jun, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Thu, 25 Jun, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From 307 €, select.
St Louis.314 € per passenger.Departing Mon, 2 Nov, returning Sun, 8 Nov.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Phoenix Sky Harbor on Mon, 2 Nov, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Sun, 8 Nov, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From 314 €, select.
St Louis.315 € per passenger.Departing Thu, 13 Aug, returning Sat, 15 Aug.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Phoenix Sky Harbor on Thu, 13 Aug, arriving in St Louis.Inbound direct flight with Southwest Airlines departs from St Louis on Sat, 15 Aug, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From 315 €, select.
St Louis.316 € per passenger.Departing Thu, 19 Nov, returning Tue, 1 Dec.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Phoenix Sky Harbor on Thu, 19 Nov, arriving in St Louis.Inbound direct flight with Southwest Airlines departs from St Louis on Tue, 1 Dec, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From 316 €, select.
St Louis.321 € per passenger.Departing Wed, 15 Jul, returning Wed, 29 Jul.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Phoenix Sky Harbor on Wed, 15 Jul, arriving in St Louis.Inbound direct flight with Southwest Airlines departs from St Louis on Wed, 29 Jul, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From 321 €, select.
St Louis.321 € per passenger.Departing Wed, 29 Jul, returning Wed, 5 Aug.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Phoenix Sky Harbor on Wed, 29 Jul, arriving in St Louis.Inbound direct flight with Southwest Airlines departs from St Louis on Wed, 5 Aug, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From 321 €, select.
St Louis.332 € per passenger.Departing Wed, 14 Oct, returning Sat, 17 Oct.Return flight with Southwest Airlines.Outbound direct flight with Southwest Airlines departs from Phoenix Sky Harbor on Wed, 14 Oct, arriving in St Louis.Inbound direct flight with Southwest Airlines departs from St Louis on Sat, 17 Oct, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From 332 €, select.

Find the cheapest month to fly from Phoenix Sky Harbor to St Louis

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Phoenix Sky Harbor to St Louis flights are currently cheapest in August.
Jun
from 307 €
Jul
from 195 €
Aug
from 153 €
Sep
from 209 €
Oct
from 227 €
Nov
from 314 €
Dec
from 352 €
Jan
Find prices
Feb
from 367 €
Mar
Find prices
Apr
Find prices
May
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Direct flights from Phoenix Sky Harbor to St Louis

Phoenix Sky Harbor to St Louis: Alternative routes

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

St Louis

20km from central St Louis
ClosestCheapest
from 153 €
Search flights

Belleville

32km from central St Louis
from 344 €
Search flights

Sparta Community

69km from central St Louis
Search flights

Phoenix to St Louis: Flight information

The things to know before you go.
Cheapest flight found153 €
Cheapest month to flyAugust
Average flight time2 hrs, 57 mins
Most popular airlineSouthwest Airlines
Average flights per week64

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

The best price we found for a return flight from Phoenix Sky Harbor to St Louis is 153 €. 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.
2 hours and 57 minutes is the average flight time from Phoenix Sky Harbor to St Louis.
Southwest Airlines, American Airlines and Alaska Airlines fly direct from Phoenix Sky Harbor to St Louis.
As of June 2026, there are 64 flights per week flying from Phoenix Sky Harbor to St Louis.
The cheapest month to fly from Phoenix Sky Harbor to St Louis is usually August.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Phoenix Sky Harbor Airport to St Louis Airport on Wednesday, 5 August 2026.
Yes – the average flight time is 2 hours and 57 minutes.
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.
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.
Currently, Frontier Airlines and Southwest Airlines offer the cheapest flight tickets to St Louis.

Travelling from Phoenix Sky Harbour Airport (PHX) to St Louis Airport (STL): what you need to know

  • The average length of a direct flight from Phoenix Sky Harbour Airport to St Louis Airport is 2 hours 55 minutes.

  • St Louis's timezone is UTC-6, which makes St Louis one hour ahead of Phoenix.

  • There are 31 Phoenix Sky Harbour Airport to St Louis Airport flights every week to choose from.

  • Arriving two hours before an international flight and one hour ahead of a domestic departure are travel rules to live by. Show up at the airport on time to catch your PHX to STL flight.

  • Be prepared for longer queues in popular months such as April. Arriving up to four hours in advance for international flights and two hours for a domestic departure is a smart move.

  • You can travel nonstop to St Louis, the United States. Take to the skies with one of these airlines that operate direct flights from Phoenix Sky Harbour Airport to St Louis Airport:

  • The majority of travellers choose to fly with Southwest Airlines on this route.

  • With an impressive 88.24% of services arriving as planned, Frontier Airlines is the most punctual carrier for PHX to STL flights.

  • We make it a breeze to book a flight with a stopover. To see your options for tickets from Phoenix Sky Harbour Airport to St Louis Airport, deselect 'Direct flights only.' Then, choose a flight offering a stop long enough to tour the city of your choice. Top stopovers between PHX and STL include:

    • Denver International Airport

    • Kansas City International Airport

    • Dallas Love Field Airport

How to find the cheapest flights from Phoenix Sky Harbour Airport (PHX) to St Louis Airport (STL)

  • Right now, 64 € is the cheapest price we've seen for a one-way Phoenix Sky Harbour Airport to St Louis Airport flight. The best price for a return plane ticket is 153 €. Remember that fares may change due to availability when booking.

  • Don't leave things to the last minute. You're more likely to find cheap tickets from PHX to STL if you book in advance. Airlines often offer some great early bird deals.

  • The cheapest month for flights from Phoenix Sky Harbour Airport to St Louis Airport is May. Use the 'Whole month' tool to find the lowest prices if you have flexible travel dates.

  • You don't need to check back in every day to see if fares have dropped when you create a Price Alert. We'll send you an update as soon as the price changes on cheap flights from PHX to STL.

  • Lock in the perfect flight for you by using the filters. To see the 'Best,' 'Fastest' or 'Cheapest' flights from Phoenix Sky Harbour Airport to St Louis Airport, use the 'Sort by' tool. You can also filter by arrival and departure times, airline, and journey duration.

Handy information about Phoenix Sky Harbour Airport (PHX)

  • PHX's address is 3400 Sky Harbour Boulevard.

  • Phoenix Sky Harbour Airport maintains a strong on-time performance, making delays less likely. Departures from PHX arrive on schedule 80% of the time.

  • To get to Phoenix Sky Harbour Airport from central Phoenix, it'll take about 10 minutes if you're going by car. This depends on traffic, however. It's approximately 5 kilometres from the airport to the city centre.

  • You can expect a trip time of around 25 minutes when using public transport.

  • Get your break off to a stress-free start by staying near PHX. Whether you have an early flight from Phoenix Sky Harbour Airport to St Louis Airport or just don't want to be rushed, these stays are the answer:

Arriving at St Louis Airport (STL)

When to fly to St Louis Airport (STL)

  • The quietest month for a flight from Phoenix Sky Harbour Airport to St Louis Airport is March, while July is the most popular. Choose the best time to visit St Louis based on whether you prefer a bustling atmosphere or a more laid-back vibe.

  • The warmest month in St Louis is July, with temperatures ranging between 17ºC (63ºF) and 33ºC (91ºF). Lock in your flights from Phoenix Sky Harbour Airport to St Louis Airport in this month if you like this kind of weather.

  • January has average temperatures of between -7ºC (19ºF) and 8ºC (46ºF). Search for cheap tickets from PHX to STL sometime then if you want to travel in cooler conditions.

Explore more of the United States

  • St Louis has its own special appeal, but there are so many other parts of the United States just waiting to be discovered. Around 418 kilometres north-east of St Louis, a visit to Chicago will keep you on the go. Check out popular attractions like Millennium Park, Art Institute of Chicago and Willis Tower.

  • Around 370 kilometres east of St Louis, Indianapolis is another favourite stop in the United States. No visit is complete without checking out Lucas Oil Stadium, Eiteljorg Museum and The Children's Museum of Indianapolis.

Plan the rest of your trip from Phoenix to St Louis

Prices shown on this page are estimated lowest prices only. Found in the last 12 days.