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Cheap Flights from Phoenix Sky Harbor (PHX) to St Louis (STL)

Compare Phoenix Sky Harbor to St Louis flight deals

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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.
St Louis.£101 per passenger.Departing Fri, 24 Apr, returning Mon, 27 Apr.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Phoenix Sky Harbor on Fri, 24 Apr, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Mon, 27 Apr, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From £101, select.
St Louis.£103 per passenger.Departing Fri, 8 May, returning Fri, 15 May.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Phoenix Sky Harbor on Fri, 8 May, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Fri, 15 May, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From £103, select.
St Louis.£114 per passenger.Departing Tue, 24 Mar, returning Sun, 29 Mar.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Phoenix Sky Harbor on Tue, 24 Mar, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Sun, 29 Mar, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From £114, select.
St Louis.£118 per passenger.Departing Tue, 31 Mar, returning Fri, 3 Apr.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Phoenix Sky Harbor on Tue, 31 Mar, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Fri, 3 Apr, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From £118, select.
St Louis.£123 per passenger.Departing Thu, 12 Mar, returning Thu, 19 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 Thu, 19 Mar, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From £123, select.
St Louis.£125 per passenger.Departing Sat, 25 Apr, returning Sun, 3 May.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Phoenix Sky Harbor on Sat, 25 Apr, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Sun, 3 May, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From £125, select.
St Louis.£153 per passenger.Departing Sat, 28 Feb, returning Mon, 2 Mar.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Phoenix Sky Harbor on Sat, 28 Feb, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Mon, 2 Mar, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From £153, select.
St Louis.£168 per passenger.Departing Fri, 27 Feb, returning Sat, 28 Feb.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Phoenix Sky Harbor on Fri, 27 Feb, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Sat, 28 Feb, arriving in Phoenix Sky Harbor.Price includes taxes and charges.From £168, 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 April.
Feb
from £168
Mar
from £114
Apr
from £101
May
from £103
Jun
Find prices
Jul
from £262
Aug
from £232
Sep
from £247
Oct
from £262
Nov
from £261
Dec
Find prices
Jan
Find prices

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

12 miles from central St Louis
ClosestCheapest
from £101
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Belleville

20 miles from central St Louis
from £305
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Sparta Community

43 miles from central St Louis
Search flights

Phoenix to St Louis: Flight information

The things to know before you go.
Cheapest flight found£101
Cheapest month to flyApril
Average flight time2 hrs, 56 mins
Most popular airlineSouthwest Airlines
Average flights per week62

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 £101. 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 56 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 February 2026, there are 62 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 April.
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 Friday, 24 April 2026.
Yes – the average flight time is 2 hours and 56 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 offers 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

  • Hop on a direct flight from Phoenix Sky Harbour International Airport to Lambert-St. Louis International Airport and you'll be in the air for an average of 2 hours 55 minutes.

  • St Louis's timezone is UTC-5, which makes St Louis two hours ahead of Phoenix.

  • Every week, there are 50 Phoenix Sky Harbour International Airport to Lambert-St. Louis International Airport flights. If you want to get going as early as possible, pick the 00:07 American Airlines flight. If you're eager to make the most of your day before you fly, the last departure is at 21:55 with Southwest Airlines.

  • For a smooth journey, arrive at the airport two hours ahead of international flights and an hour before domestic departures. This will give you plenty of time to board your PHX to STL flight.

  • During popular months such as July, it's best to get to the airport even earlier. Plan to arrive two hours before domestic departures and four hours ahead of an international flight whenever you're travelling during peak periods in general.

  • You can fly nonstop to St Louis, United States. Book a ticket with one of these airlines offering direct flights from Phoenix Sky Harbour International Airport to Lambert-St. Louis International Airport:

  • American Airlines is the airline most travellers choose for this route.

  • With a dependable 81.63% of services arriving as planned, Southwest Airlines has the best on-time record for PHX to STL flights.

  • Think about adding a stopover when booking your ticket from Phoenix Sky Harbour International Airport to Lambert-St. Louis International Airport. Simply deselect 'Direct flights only' to break up your trip, or maybe even explore a new city along the way. Here are some options between PHX and STL:

    • Kansas City International Airport

    • Denver International Airport

    • Des Moines 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 seen for a one-way Phoenix Sky Harbour International Airport to Lambert-St. Louis International Airport flight is £45. A round-trip fare right now is £101. Depending on the availability when you book, these fares may change.

  • To get cheap tickets from PHX to STL, book your journey six months ahead of your planned departure.

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

  • Landing cheap flights from PHX to STL is a cinch with Price Alerts. All you need to do is set up one of these automatic alerts and we'll get in touch as soon as there's a better deal.

  • Find the ideal flight for you by using the filters. To see the 'Cheapest,' 'Fastest' or 'Best' flights from Phoenix Sky Harbour International Airport to Lambert-St. Louis International Airport, use the 'Sort by' function. You can also filter by airline, arrival and departure times, and number of stops.

Handy information about Phoenix Sky Harbour International Airport (PHX)

  • You'll find PHX at 3400 Sky Harbour Boulevard.

  • Phoenix Sky Harbour International Airport maintains a strong on-time record, reducing your chances of a delayed flight. Departures from PHX land at their destination as scheduled 82.57% of the time.

  • Phoenix Sky Harbour International Airport is around 5 miles from central Phoenix. If you're driving, ride-sharing or catching a cab from the centre, it'll take 10 minutes or so to arrive, depending on the traffic.

  • The trip on public transport takes roughly 35 minutes.

  • Booked an early flight from Phoenix Sky Harbour International Airport to Lambert-St. Louis International Airport? Avoid the stress of rushing to the airport (and sneak in some extra precious sleep) 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

  • STL is located at 10701 Lambert International Blvd..

  • From Lambert-St. Louis International Airport, St Louis is approximately 16 miles away. It takes around 20 minutes to reach the centre by car.

  • It takes around 35 minutes to get there 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. For smaller crowds, visit St Louis in April.

  • Lock in your flight from Phoenix Sky Harbour International Airport to Lambert-St. Louis International Airport for July if you want to go to St Louis during its warmest month. Expect temperatures of between 17ºC (63ºF) and 33ºC (91ºF).

  • January has average temperatures of between -8ºC (18ºF) and 7ºC (45ºF). Search for cheap tickets from PHX to STL around that time if you want to travel in cooler conditions.

Explore more of United States

  • You've seen St Louis, now it's time to explore other corners of United States. Journey around 260 miles north-east to Chicago to tick off its leading sights. From Millennium Park to Art Institute of Chicago and LandShark Beer Garden at Navy Pier, there's plenty to keep you busy.

  • Indianapolis is another well-known destination in United States and is around 230 miles east of St Louis. No journey is complete without dropping by The Children's Museum of Indianapolis, Indianapolis Museum of Art and Indianapolis Zoo.

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 45 days.