Cheap Flights from Phoenix to St Louis

Travellers and cabin class

Compare Phoenix to St Louis flight deals

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

Book the best St Louis fare with no extra fees

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.

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 August.

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 foundRs20,304
Cheapest month to flyAugust
Average flight time2 hrs, 59 mins
Most popular airlineSouthwest Airlines
Average flights per week58

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

The best price we found for a return flight from Phoenix to St Louis is Rs40,608. 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 59 minutes is the average flight time from Phoenix to St Louis.
Southwest Airlines, American Airlines and Alaska Airlines fly direct from Phoenix to St Louis.
As of June 2025, there are 58 flights per week flying from Phoenix to St Louis.
The cheapest month to fly from Phoenix to St Louis is usually June 2025.
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, 6 August 2025.
Yes – the average flight time is 2 hours and 59 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.

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

  • Start planning your holiday by checking out the most convenient departure point for your flight from Phoenix to Lambert-St. Louis International Airport (STL). Explore the options for departing from Phoenix Sky Harbour International Airport (PHX) or Phoenix-Mesa Gateway Airport (AZA), two of the city's main airports.

  • Expect to be in the air for 2 hours 56 minutes. On average, that's the duration of a direct flight from Phoenix to Lambert-St. Louis International Airport.

  • Lambert-St. Louis International Airport is located in St Louis. The city operates in the UTC-5 timezone and is 2 hours ahead of Phoenix.

  • With 50 direct weekly flights between the two airports, Phoenix Sky Harbour International Airport (PHX) to Lambert-St. Louis International Airport (STL) is the most popular route. American Airlines operates the earliest flight at 00:07. If you'd like to get more out of your day before leaving, the last departure from PHX to STL is with Southwest Airlines at 21:55.

  • For a stress-free 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 catch your flight from Phoenix to STL.

  • With more travellers during busy months like July, get to the terminal earlier than usual. Two hours for domestic flights and up to four for international journeys will allow extra time for delays. Remember things also get busy during major holidays like Christmas.

Airports in Phoenix

Phoenix Sky Harbour International Airport (PHX)

About Lambert-St. Louis International Airport (STL)

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

  • From Lambert-St. Louis International Airport, St Louis is approximately 26 kilometres away. It takes around 21 minutes to reach the centre driving.

  • Getting there on public transport will take you around 36 minutes.

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

  • Rs20,304 is the lowest price we've found for a one-way ticket from Phoenix to Lambert-St. Louis International Airport. Return flights start from Rs40,608. Prices are subject to change based on availability and may vary at the time of booking.

  • It's usually best to book ahead of time if you're hoping to get cheap tickets from Phoenix to STL. That's because airlines change prices based on demand, which tends to rise closer to the date of departure.

  • Take advantage of the 'Whole month' search function to compare the prices of tickets from Phoenix to Lambert-St. Louis International Airport across the month. The lowest fares are marked in green, so you can quickly pick a flight that fits your budget.

  • Locking in a cheap ticket from Phoenix to STL couldn't be easier with Price Alerts. All you need to do is set up one of these automatic alerts and we'll let you know as soon as there's a better deal.

  • Take advantage of the filters to find your ideal journey. To see the 'Best,' 'Cheapest' or 'Fastest' flights from Phoenix to Lambert-St. Louis International Airport, use the 'Sort by' function. You can also filter results by airline, departure and arrival times, and journey duration.

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

  • April is the quietest time to fly to St Louis. Alternatively, follow the crowds and go in July. This is the busiest month for flights from Phoenix to Lambert-St. Louis International Airport.

  • Book your flight from Phoenix to STL for July if you're eager to explore the city during its warmest month. You can expect temperatures in St Louis to range from 17ºC to 33ºC.

  • If you want cooler conditions, look for a cheap flight from Phoenix to Lambert-St. Louis International Airport in January when temperatures average between -8ºC and 7ºC.

More about St Louis

Complete your St Louis trip with a car rental

  • Select one of our car rentals in St Louis and explore the city on your own terms. Easily compare prices from trusted providers in one go after booking your hotel and cheap flights from Phoenix to Lambert-St. Louis International Airport.

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