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

Direct flights offer convenience by minimizing travel time and avoiding layovers. However, they are not always the cheapest option; connecting flights can sometimes be more affordable. Evaluate your priorities for cost versus travel duration when making your choice.

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

Yes, being flexible with your travel dates often provides more opportunities to find lower fares. Prices can vary significantly between different days of the week or even specific times of day. Adjusting your departure or return by a day or two may lead to savings.

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 additional expenses helps you calculate the total cost of 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 today

485 airlines compared

80%+ AI score for best value

Fares are subject to change and may not be available for all dates. (Data last updated Nov 2, 2026.)

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

Explore current cheapest deals departing from Phoenix to St. Louis

2026-12-15 – 2026-12-18
PHX - St. Louis
80% AI deal score
$281
$162
Round trip
2026-11-24 – 2026-12-07
PHX - St. Louis
79% AI deal score
$415
$185
Round trip
2026-12-04 – 2026-12-07
PHX - St. Louis
77% AI deal score
$283
$185
Round trip
2026-12-03 – 2026-12-07
PHX - St. Louis
77% AI deal score
$283
$185
Round trip
2026-12-01 – 2026-12-07
PHX - St. Louis
76% AI deal score
$270
$185
Round trip
2026-11-24 – 2026-12-09
PHX - St. Louis
78% AI deal score
$407
$187
Round trip
2026-11-24 – 2026-12-05
PHX - St. Louis
79% AI deal score
$425
$187
Round trip
2026-11-24 – 2026-12-19
PHX - St. Louis
78% AI deal score
$393
$187
Round trip
2026-11-24 – 2026-12-14
PHX - St. Louis
78% AI deal score
$394
$187
Round trip
2026-11-24 – 2026-12-11
PHX - St. Louis
78% AI deal score
$396
$187
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 8h 9m, including connections. This duration reflects the fact that most itineraries on this route involve at least one stopover. Travelers can expect a median of 2 connections when not flying direct.

For travelers seeking cheap flights from Phoenix to St. Louis, prices right now are below the typical level. Fares for this route typically range from $376–$674, with a median of $467. Approximately 10% of recent fares have been classified as a good price.

When is the cheapest time to fly from Phoenix to St. Louis? The most affordable month to fly is typically December, with a median fare of $137. Following December, August also offers competitive pricing, with a median of $310, and November shows a median of $444.

The route from Phoenix to St. Louis covers a distance of 2027 km, classifying it as a medium-haul flight. New deals for this route appear almost daily, indicating frequent opportunities to find competitive fares.

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

Regular price: $227 - $488

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

The regular price range for flights from Phoenix to St. Louis is typically between $227 and $488. The current lowest deal is $162 with Frontier Airlines for travel from Dec 15-Dec 18.

now $162

Low $227

High $488

The cheapest time to fly from Phoenix to St. Louis

The cheapest month to fly from Phoenix to St. Louis is December, with a median price of $141. The most expensive month is July, with a median price of $665. Prices are generally lower from January to December.

December

Cheapest

Flights from $141

July

Most Expensive

Flights from $665

Jan

Feb

Jul

Aug

Sep

Oct

Nov

Dec

Direct flights from Phoenix to St. Louis

Frontier Airlines

United Airlines

Alaska Airlines, Inc.

Southwest Airlines

Last-minute flights going from Phoenix to St. Louis

Mon, Nov 2

⌛ Last-Minute

PHX - St. Louis

Phoenix (PHX) - St. Louis (STL)

Frontier Airlines

$465

$276

One-way

Mon, Nov 2

⌛ Last-Minute

PHX - St. Louis

Phoenix (PHX) - St. Louis (STL)

Frontier Airlines

$547

$328

One-way

Mon, Nov 2

⌛ Last-Minute

PHX - St. Louis

Phoenix (PHX) - St. Louis (STL)

Frontier Airlines

$509

$338

One-way

Mon, Nov 2

⌛ Last-Minute

PHX - St. Louis

Phoenix (PHX) - St. Louis (STL)

Frontier Airlines

$633

$354

One-way

Mon, Nov 2

⌛ Last-Minute

PHX - St. Louis

Phoenix (PHX) - St. Louis (STL)

Frontier Airlines

$455

$373

One-way

Thu, Nov 5

⌛ Last-Minute

PHX - St. Louis

Phoenix (PHX) - St. Louis (STL)

Frontier Airlines

$444

$276

One-way

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

3 nights

Dec 15 - Dec 18

$281 → $162

42%

3 nights

Dec 4 - Dec 7

$283 → $185

35%

4 nights

Dec 3 - Dec 7

$283 → $185

35%

2 nights

Dec 3 - Dec 5

$285 → $187

34%

Popular Airports to fly from Phoenix to St. Louis

Phoenix - St. Louis route insights

💸 Price insights

Recent fares are below the typical level.

Recent fares from Phoenix to St. Louis are below the typical level of $467.

📅 Best time to fly

December is historically cheapest at $137.

Historically, December is the cheapest month to fly from Phoenix to St. Louis, with a median price of $137.

⏱️ Flight duration

Connecting flights typically take 8h 9m.

Connecting flights from Phoenix to St. Louis typically take 8h 9m, covering 2027 km.

✈️ Airlines & availability

Connecting flights are dominant on this route.

Connecting flights are dominant, with a median of 2 stopovers for this route.

🏆 Airline highlight

Frontier Airlines has 88 direct deals.

Frontier Airlines offers 88 direct deals, making it a frequent choice for this route.

🎯 Booking tip

Deals appear frequently, about every 30 days.

Deals for flights from Phoenix to St. Louis appear frequently, about every 30 days.

Phoenix main airports to depart from

Phoenix Sky Harbor International (PHX)

Cheapest

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

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

💸 Flights from ~$187

St. Louis main airports to arrive at

St. Louis Lambert International (STL)

Cheapest

St. Louis Lambert International Airport is a convenient arrival point for St. Louis.

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

💸 Flights from ~$172

Airports nearby St. Louis used as alternative

MidAmerica St. Louis (BLV)

MidAmerica St. Louis (BLV) is a useful alternative, especially for travelers on the Illinois side of the metro area.

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

💸 Flights from ~$270

Business & First Class Flight Deals to St. Louis

76% AI deal score

$1,267

$949

Save $318

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 various airlines and booking platforms can also help you identify better deals. Setting up price alerts may notify you when fares drop for your desired route.

Booking flights in advance, often several weeks or months before your intended departure, may result in lower prices. However, prices can fluctuate, so monitoring fare trends is usually beneficial. Last-minute deals are less common but can sometimes appear.

Comparing nearby airports can sometimes uncover more economical flight options or different schedules. While it may add to your ground travel time, the potential 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

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Phoenix to St. Louis: Overview

Insights for flights from Phoenix to St. Louis

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

Regular price: $227 - $488

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

The regular price range for flights from Phoenix to St. Louis is typically between $227 and $488. The current lowest deal is $162 with Frontier Airlines for travel from Dec 15-Dec 18.

now $162

Low $227

High $488

The cheapest time to fly from Phoenix to St. Louis

December

Cheapest

Flights from $141

July

Most Expensive

Flights from $665

Jan

Feb

Jul

Aug

Sep

Oct

Nov

Dec