Cheap Flights from Phoenix (PHX) to St. Louis (CPS)

Popular airlines from Phoenix Sky Harbor Intl. Airport (PHX) to St. Louis, MO (CPS-St. Louis Downtown)

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Alternative airports near St. Louis

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Lambert-St. Louis Intl. STL. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $205
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city center20 min
Flights from $205

Frequently asked questions

How much does a flight from Sky Harbor Intl. Airport (PHX) to St. Louis Downtown Airport (CPS) cost?
Secure a cheap one-way flight or cheap return flight from Sky Harbor Intl. Airport (PHX) to St. Louis Downtown Airport (CPS) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Sky Harbor Intl. Airport (PHX) to St. Louis Downtown Airport (CPS)?
is the least expensive month to fly from PHX to CPS. Timing your trip outside of the busy season is often the key to better flight prices.
What is the cheapest airline that flies from Sky Harbor Intl. Airport (PHX) to St. Louis Downtown Airport (CPS)?
Use the filter tool on Expedia to compare different airlines and find the most affordable carrier that'll take you from PHX to CPS. Then, sort your results by "Price (lowest to highest)" to snap up a good deal.
How many flights per day from Sky Harbor Intl. Airport (PHX) to St. Louis Downtown Airport (CPS)?
You'll need to hop on a flight with a layover if you're traveling from Sky Harbor Intl. Airport (PHX) to St. Louis Downtown Airport (CPS). There are no daily direct flights on this route. However, simply filter your search to include one or two stops to find an option that works for you.
What day of the week has the most flights from PHX to CPS?
Generally you'll find the greatest selection of flight options on a Friday. Tuesdays are often the quietest.* But this can change based on the season, carrier and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Sky Harbor Intl. Airport (PHX) to St. Louis Downtown Airport (CPS)?
To reach St. Louis Downtown Airport (CPS) on schedule, choose a flight that takes off from Sky Harbor Intl. Airport (PHX) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this time.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports do you fly into for East St. Louis from Sky Harbor Intl. Airport (PHX)?
Explore your flight options from Sky Harbor Intl. Airport (PHX) to Lambert-St. Louis Intl. Airport (STL). This is the only airport in East St. Louis you can arrive at if you're taking a direct flight.
Is it cheaper to buy a plane ticket from Sky Harbor Intl. Airport (PHX) to St. Louis Downtown Airport (CPS) last-minute?
Waiting until just before your trip to book your flight from PHX to CPS often results in higher prices. While you might find some last-minute offers, they aren't always guaranteed. Keep your travel schedule open for the best chance of snagging a bargain.
Is it cheaper to book a PHX to CPS flight and hotel package?
Securing a PHX to CPS flight and hotel package tends to be cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our wide range of hotels and then add car rentals, flights and activities to your booking. Bundle it all together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Sky Harbor Intl. Airport (PHX) to St. Louis Downtown Airport (CPS)?
Typically, it's possible to cancel or reschedule your PHX to CPS flight. However, if the booking was made more than 24 hours ago, additional charges may apply. Refer to your airline's policies in your itinerary to see what changes are allowed and if any costs are involved. You'll also find more details on our Customer Service portal.

Travel information

Travel information

Origin airport
Sky Harbor Intl.
Destination airport
St. Louis Downtown
Distance
1268 mi

Book with confidence

Book with confidence

Phoenix to St. Louis Flights

The cheapest times to fly from Phoenix to St. Louis

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Phoenix to St. Louis are during the month of . You can find some of the cheapest flights from Phoenix to St. Louis with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Phoenix to St. Louis

Sunday is one of the best days to book for cheap flights from Phoenix to St. Louis: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Phoenix to St. Louis

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Phoenix to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Phoenix to St. Louis flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Phoenix to St. Louis airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Phoenix to St. Louis Flights

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