Cheap Flights from Phoenix Sky Harbor to St Louis

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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 to St Louis? Find the lowest prices on one-way and return tickets right here.

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 April.

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.

Phoenix to St Louis: Flight information

The things to know before you go.
Cheapest flight foundج.م.‏ 4,077
Cheapest month to flyApril
Average flight time2 hrs, 57 mins
Most popular airlineSouthwest Airlines
Average flights per week118

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 ج.م.‏ 7,639. 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, Alaska Airlines and American Airlines fly direct from Phoenix Sky Harbor to St Louis.
As of March 2025, there are 118 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 March 2025.
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 Tuesday, 15 April 2025.
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.

Flying from Phoenix Sky Harbour International Airport (PHX) to Lambert-St. Louis International Airport (STL): what you need to know

  • A direct flight from Phoenix Sky Harbour International Airport to Lambert-St. Louis International Airport takes an average of 2 hours 56 minutes. The timezone in St Louis is UTC-5, which makes it 2 hours ahead of Phoenix.

  • There are 50 flights from Phoenix Sky Harbour International Airport to Lambert-St. Louis International Airport weekly. Choose the 00:07 flight if you want to get going as soon as possible. If you'd like to leave later, the last flight from PHX to STL departs at 23:41.

  • Hopping on a plane during a peak month like July? High seasons (like spring break, summer and New Year) can easily add another hour at check-in and security. Be extra safe and arrive up to four hours ahead of international flights and two hours before a domestic departure.

  • Frontier Airlines offers direct flights from Phoenix Sky Harbour International Airport to Lambert-St. Louis International Airport. Book with this popular airline, then get ready to discover the sights in St Louis — and maybe even more of United States if time allows.

  • If you want to break up your flight from Phoenix Sky Harbour International Airport to Lambert-St. Louis International Airport, think about adding a stopover. Just uncheck 'Direct flights only' and find a destination that appeals to you. The most popular stopovers on the PHX - STL route include:

    • Kansas City International Airport

    • Dallas Love Field

    • Denver International Airport

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

  • The lowest price we've found for a one-way ticket from Phoenix Sky Harbour International Airport to Lambert-St. Louis International Airport is ج.م.‏ 4,077. For a return flight on this route, the best price is ج.م.‏ 7,639. Depending on the availability and when you book, these fares may change.

  • Get cheap flight tickets from PHX to STL by booking 9 months ahead. According to our research, that's the sweet spot for finding a bargain.

  • May is the cheapest month for flight tickets from Phoenix Sky Harbour International Airport to Lambert-St. Louis International Airport. If you'd like to travel at a different time of year, the 'Whole month' tool will show you the lowest prices for every month.

  • Sign into your online account or use the app to set up a Price Alert. You'll be notified straight away if there's a better deal on this route. It's easy to do, and it'll save you the hassle of looking for cheap flight tickets from PHX to STL every day.

  • Use filters to tailor your flights from Phoenix Sky Harbour International Airport to Lambert-St. Louis International Airport. Enter your ideal arrival and departure times, airlines and number of stops. Or sort your results by 'Cheapest' to get the best deals.

Handy information about Phoenix Sky Harbour International Airport (PHX)

  • Phoenix Sky Harbour International Airport is around 8 kilometres from central Phoenix. If you're catching a cab, driving or ride-sharing from the centre, it'll take 11 minutes or so to get there, depending on traffic conditions. If you're using public transport, expect the travel time to be approximately 34 minutes.

  • Taking an early flight from Phoenix Sky Harbour International Airport to Lambert-St. Louis International Airport? Avoid the last-minute rush to the airport (and enjoy a little extra shut-eye) by choosing one of these stays near PHX:

Arriving at Lambert-St. Louis International Airport (STL)

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

  • Lambert-St. Louis International Airport is approximately 26 kilometres from the centre of St Louis. With your own car rental or if you're catching a cab, the drive is about 21 minutes.

  • It takes roughly 36 minutes if you're travelling by public transport.

When to fly to Lambert-St. Louis International Airport (STL)

  • July is the busiest month for flights from Phoenix Sky Harbour International Airport to Lambert-St. Louis International Airport. To skip the crowds, visit St Louis in April.

  • The warmest month in St Louis is July, with the temperature ranging between 17 ºC and 33 ºC. Lock in your flights from Phoenix Sky Harbour International Airport to Lambert-St. Louis International Airport in this month if this is the kind of weather you like.

  • January has average temperatures of between -8 ºC and 7 ºC. Search for cheap flight tickets from PHX to STL around that time if you want to travel when it's cooler.

More about St Louis

  • If you're looking for somewhere to lay your head, you'll find the best stays in St Louis right here. Explore these options after locking in your flight from PHX to STL:

  • There are so many things to do and see in this city it can be hard to work out where to begin. The Gateway Arch, Forest Park and St. Louis Zoo are top sights which should feature on any well-planned St Louis itinerary.

Complete your St Louis trip with hotels and a car rental

  • After you've secured your cheap ticket to Lambert-St. Louis International Airport, browse the lowest prices and exclusive offers on hotels. You can also compare a range of car rental companies in one place to get the best car rental price for your St Louis escape.

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.