Are direct flights from Phoenix to St. Louis always the best option?

Direct flights offer convenience and save travel time, but they are not always the most economical choice. Flights with layovers can sometimes be significantly cheaper, depending on the route and airline. Consider your budget and time constraints when making your decision.

Can flexible travel dates help on Phoenix to St. Louis flights?

Yes, being flexible with your travel dates can often lead to finding more affordable flights. Prices can vary greatly between different days of the week or even within the same week. Using a flexible date search tool can help you identify the cheapest days to fly.

What extra costs should I check before booking Phoenix to St. Louis flights?

Before booking, always check for potential extra costs such as baggage fees, seat selection charges, and in-flight services. Some airlines may also charge for printing boarding passes at the airport. Understanding these fees upfront can help you budget accurately for your trip.

Flights From Phoenix

To St. Louis

Cheap Flights from Phoenix to St. Louis

Browse current best options from Phoenix. Become a member to unlock all deals and get alerts when new deals appear.

Deals from

Phoenix

RatePunk searches hundreds of travel sites at once for deals on flights to St. Louis

Prices updated 2 days ago

405 airlines compared

80%+ AI score for best value

Fares are subject to change and may not be available for all dates. (Data last updated Jul 26, 2026.)

Today’s best flight deals from Phoenix to St. Louis

Explore current cheapest deals departing from Phoenix to St. Louis

2026-08-05 – 2026-08-12
PHX - St. Louis
77% AI deal score
$295
$200
Round trip
2026-09-11 – 2026-09-14
PHX - St. Louis
77% AI deal score
$322
$207
Round trip
2026-10-10 – 2026-10-26
PHX - St. Louis
65% AI deal score
$230
$213
Round trip
2026-09-06 – 2026-09-10
PHX - St. Louis
75% AI deal score
$319
$221
Round trip
2026-09-10 – 2026-09-13
PHX - St. Louis
75% AI deal score
$322
$224
Round trip
2026-08-06 – 2026-08-09
PHX - St. Louis
76% AI deal score
$322
$225
Round trip
2026-09-06 – 2026-09-11
PHX - St. Louis
74% AI deal score
$314
$226
Round trip
2026-08-10 – 2026-08-15
PHX - St. Louis
74% AI deal score
$305
$229
Round trip
2026-08-20 – 2026-08-24
PHX - St. Louis
74% AI deal score
$308
$230
Round trip
2026-08-24 – 2026-08-27
PHX - St. Louis
69% AI deal score
$301
$230
Round trip

Phoenix to St. Louis: Overview

Insights for flights from Phoenix to St. Louis

A typical journey from Phoenix to St. Louis takes about 13h 5m, including connections. This duration reflects that most itineraries connect at least once, with the median number of stopovers for connecting flights being 2.

For travelers seeking cheap flights from Phoenix to St. Louis, fares right now are below the typical level. Prices typically range from $359–$647, with a median of $482. Currently, 7% of recent fares are classified as a good price, and new deals appear almost daily.

The cheapest time to fly from Phoenix to St. Louis is often in August, with a median fare of $185. Other cost-effective months include April, where the median fare is $228, and March, with a median fare of $282.

The route from Phoenix to St. Louis covers a distance of 2027 km, classifying it as a medium-haul flight.

How much is a round trip from Phoenix to St. Louis

Regular price: $190 - $418

Prices for flights from Phoenix to St. Louis are currently below the regular range.

Regular prices for flights from Phoenix to St. Louis typically range from $190 to $418. The current lowest deal is $184 with Frontier Airlines, for travel from Oct 7-Oct 28.

now $184

Low $190

High $418

The cheapest time to fly from Phoenix to St. Louis

The cheapest month to fly from Phoenix to St. Louis is August, with a median price of $185. The most expensive month is December, with a median price of $689. Prices are generally lower from March to October.

August

Cheapest

Flights from $185

December

Most Expensive

Flights from $689

Jan

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Direct flights from Phoenix to St. Louis

American Airlines

Last-minute flights going from Phoenix to St. Louis

Sun, Jul 26

⌛ Last-Minute

PHX - St. Louis

Phoenix (PHX) - St. Louis (STL)

Frontier Airlines

$453

$378

One-way

Tue, Jul 28

⌛ Last-Minute

PHX - St. Louis

Phoenix (PHX) - St. Louis (STL)

Frontier Airlines

$459

$362

One-way

Thu, Jul 30

⌛ Last-Minute

PHX - St. Louis

Phoenix (PHX) - St. Louis (STL)

Frontier Airlines

$460

$382

One-way

Sat, Aug 8

⌛ Last-Minute

PHX - St. Louis

Phoenix (PHX) - St. Louis (STL)

Frontier Airlines

$351

$282

One-way

Tue, Aug 11

⌛ Last-Minute

PHX - St. Louis

Phoenix (PHX) - St. Louis (STL)

Frontier Airlines

$325

$239

One-way

Wed, Aug 12

⌛ Last-Minute

PHX - St. Louis

Phoenix (PHX) - St. Louis (STL)

Frontier Airlines

$322

$269

One-way

Biggest price drops on these dates for flights from Phoenix to St. Louis

4 nights

Nov 5 - Nov 9

$526 → $234

56%

1 night

Nov 18 - Nov 19

$546 → $275

50%

6 nights

Nov 2 - Nov 8

$503 → $285

43%

9 nights

Nov 6 - Nov 15

$507 → $314

38%

Popular Airports to fly from Phoenix to St. Louis

Phoenix - St. Louis route insights

💸 Price insights

Recent fares are below the typical level.

Recent Phoenix to St. Louis fares are below the typical level of $482.

📅 Best time to fly

August is historically the cheapest month to fly.

Historically, August is the cheapest month to fly from Phoenix to St. Louis, with a median price of $185.

⏱️ Flight duration

Connecting flights typically take 13h 5m.

The typical flight duration from Phoenix to St. Louis is 13h 5m, with 2 stopovers.

✈️ Airlines & availability

Connecting flights are dominant on this route.

Connecting flights are dominant on this route, making up 90% of recent deals.

🏆 Airline highlight

Frontier Airlines offers a recent deal for $184.

A recent deal on Frontier Airlines for $184 was found from Phoenix to St. Louis.

🎯 Booking tip

Deals appear frequently for this route.

Deals from Phoenix to St. Louis appear frequently, with many deals appearing in the last 30 days.

Phoenix main airports to depart from

Phoenix Sky Harbor International (PHX)

Cheapest

Phoenix Sky Harbor International Airport is a primary option for flights from Phoenix to St. Louis.

📍 ~6 km from Phoenix city center (reachable by car or bus)

💸 Flights from ~$159

St. Louis main airports to arrive at

St. Louis Lambert International (STL)

Cheapest

St. Louis Lambert International Airport is a convenient arrival point for flights from Phoenix to St. Louis.

📍 ~20 km from St. Louis (reachable by car)

💸 Flights from ~$159

Airports nearby St. Louis used as alternative

MidAmerica St. Louis (BLV)

MidAmerica St. Louis (BLV) is the closest alternative and a secondary relief airport for the St. Louis metropolitan area.

📍 ~50 km from St. Louis (reachable by car)

💸 Flights from ~$231

Business & First Class Flight Deals to St. Louis

80% AI deal score

$1,430

$1,022

Save $408

Frequently Asked Questions About Flights to St. Louis

To find more affordable flights, consider being flexible with your travel dates and times. Comparing prices across different airlines and booking sites can also help you discover better deals. Looking into flights with layovers may sometimes offer lower fares than direct routes.

Booking flights in advance often provides more competitive prices, though last-minute deals can sometimes appear. Prices may fluctuate, so monitoring fares over time can help you identify a good booking window. Weekday travel can sometimes be less expensive than weekend travel.

Comparing nearby airports can sometimes reveal different flight options and potentially lower prices. While it may add to your ground travel time, the savings on airfare could be significant. Always factor in the total cost and convenience when considering alternative airports.

Related routes

More routes from Phoenix

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Flights to St. Louis from other cities

Flights from Aberdeen to St. Louis Flights from Atlanta to St. Louis Flights from Austin to St. Louis Flights from Brussels to St. Louis Flights from Dallas to St. Louis Flights from Florence to St. Louis Flights from Las Vegas to St. Louis Flights from Prague to St. Louis Flights from Rome to St. Louis Flights from San Antonio to St. Louis Flights from San Diego to St. Louis Flights from Singapore to St. Louis

Phoenix to St. Louis: Overview

Insights for flights from Phoenix to St. Louis

The route from Phoenix to St. Louis covers a distance of 2027 km, classifying it as a medium-haul flight.

How much is a round trip from Phoenix to St. Louis

Regular price: $190 - $418

Prices for flights from Phoenix to St. Louis are currently below the regular range.

Regular prices for flights from Phoenix to St. Louis typically range from $190 to $418. The current lowest deal is $184 with Frontier Airlines, for travel from Oct 7-Oct 28.

now $184

Low $190

High $418

The cheapest time to fly from Phoenix to St. Louis

August

Cheapest

Flights from $185

December

Most Expensive

Flights from $689

Jan

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec