Question 1

How much does a flight from Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) cost?

Accepted Answer

You can find cheap one-way flights from $80 and cheap return flights from $160 Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) with Expedia. One-way flights generally range between $177 and $906, and roundtrip flights usually range from $338 to $1566. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) ticket fares go up or down.

*Typical price ranges based on flights available on Expedia in the last year. Prices include multi-airline options.

Question 2

What is the cheapest month to fly from Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?

Accepted Answer

November is typically the cheapest month to fly from Phoenix, AZ (PHX) to St. Louis, MO (STL), with average round-trip fares around $356. This is about 13% lower than the average price throughout the year, as November often has lower travel demand before the holiday season. Other economical months to consider are September and October.

*Averages based on flights available on Expedia in the last year.

Question 3

Which airlines fly direct from Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?

Accepted Answer

2 airlines operate nonstop service from PHX to STL:

American Airlines operates around 17 direct flights from PHX to STL every week
Frontier Airlines operates around 9 direct flights from PHX to STL every week

Question 4

What is the cheapest airline that flies from Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?

Accepted Answer

Frontier Airlines is one of the cheapest airlines offering nonstop flights from Sky Harbor Intl. (PHX) to Lambert-St. Louis Intl. (STL), with round-trip tickets starting from around $390. American Airlines offers one of the cheapest connecting flights from Sky Harbor Intl. (PHX) to Lambert-St. Louis Intl. (STL) with a layover in Dallas-Fort Worth Intl. (DFW) starting from around $585. Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.

*Prices based on flights available on Expedia in the last year.

Question 5

How do I find cheap flights from Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?

Accepted Answer

To find a cheap flight from Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.

Question 6

What is the best airline to fly with from Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?

Accepted Answer

The best airline to fly with from Phoenix, AZ (PHX) to St. Louis, MO (STL) will differ from traveler to traveler. If you like to fly early, WN offers early morning flights. If price is the most important factor, Frontier Airlines typically offers the lowest fares. WN offers the most daily flights from PHX to STL, which is great if flexibility is what you value most. The best carrier for this journey could also be the one you have a loyalty membership with, as flying with that airline or another airline within the same alliance could help you collect points or enjoy lounge access.

Question 7

What is the best time to fly from Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?

Accepted Answer

The best time to fly from Phoenix, AZ (PHX) to St. Louis, MO (STL) is in October or November. You can find return flights for about $356 during these months. October is popular for its mild weather and beautiful fall foliage, while November offers a quieter travel experience before the holiday rush.

*Prices based on flights available on Expedia in the last year.

Question 8

How many flights per day from Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?

Accepted Answer

There are approximately 7 nonstop flights per day from Sky Harbor Intl. (PHX) to Lambert-St. Louis Intl. (STL). For more options, look at flights that include layovers.

Question 9

What is the earliest flight from Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?

Accepted Answer

The earliest flight from Sky Harbor International Airport (PHX) to Lambert-St. Louis International Airport (STL) usually departs at around 12:15 AM, with American Airlines and Southern Airways Express providing this seasonal service. An early flight like this can help you arrive in St. Louis with plenty of time to explore. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.

Question 10

What are the most popular departure times for flights from Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?

Accepted Answer

The most popular departure times for flights from Phoenix (PHX) to St. Louis (STL) are in the early morning, from 6am to 9am. About 26% of passengers prefer this time window. Many major carriers, including United Airlines and Southwest Airlines, offer flights during this window. This timing is favored as it allows you to arrive in St. Louis early and make the most of your day.

Question 11

How long does it take to fly from Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?

Accepted Answer

Direct flights from PHX to STL usually take about 3 hours, traveling roughly 1,259 miles. If you opt for a connecting flight, expect to add around 4 hours to your journey. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.

Question 12

Can you fly business or first class from Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?

Accepted Answer

First class seats are offered on the PHX to STL route. First class cabins are available on:

Delta Air Lines
United Airlines
American Airlines

Question 13

How do I earn miles on a Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight with Expedia?

Accepted Answer

It's easy to earn miles on a Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.

*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.

Question 14

What airports do you fly into for St. Louis from Sky Harbor Intl. (PHX)?

Accepted Answer

From Sky Harbor Intl. (PHX), you can fly into Lambert-St. Louis Intl. (STL) to reach St. Louis. Some flights may connect through major hubs like Harry Reid Intl. (LAS), Portland Intl. (PDX), Denver Intl. (DEN) before reaching St. Louis. Compare routes and airports on Expedia to find the best flight options for your travel plans.

Question 15

Is it cheaper to buy a plane ticket from Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) at the last minute?

Accepted Answer

Typically, booking a last minute flight from Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.

Question 16

Is it cheaper to book a Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight and hotel package?

Accepted Answer

Securing a Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) St Louis Vacation Packages is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.

Question 17

Can I cancel or change the date of my flight from Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?

Accepted Answer

If you booked your Phoenix, AZ (PHX-Sky Harbor Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Origin airport	Sky Harbor Intl.
Destination airport	Lambert-St. Louis Intl.
Airlines serving	Alaska Airlines, American Airlines, Delta, Frontier Airlines, Southwest Airlines, United
Roundtrip price	$160
Distance	1259 mi
Average flight time	4 hours 54 mins

Popular airlines from Phoenix Sky Harbor Intl. Airport (PHX) to St. Louis Lambert Intl. Airport (STL)

Cheap Flights from Phoenix to St. Louis (PHX-STL)

Alternative airports near St. Louis

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$80 Cheap Flights from Phoenix (PHX) to St. Louis (STL)