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

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

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

Yes, having flexible travel dates can often lead to finding more affordable flights. Prices can vary significantly between different days of the week or even within the same week. Adjusting your departure or return by a day or two may unlock better deals.

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 fees can help you calculate the true 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 1 day ago

461 airlines compared

80%+ AI score for best value

Fares are subject to change and may not be available for all dates. (Data last updated Sep 14, 2026.)

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

Explore current cheapest deals departing from Phoenix to St. Louis

2026-10-21 – 2026-10-28
PHX - St. Louis
68% AI deal score
$249
$208
Round trip
2026-10-06 – 2026-11-02
PHX - St. Louis
47% AI deal score
$212
$222
Round trip
2026-10-06 – 2026-10-26
PHX - St. Louis
47% AI deal score
$213
$224
Round trip
2026-10-22 – 2026-10-26
PHX - St. Louis
67% AI deal score
$262
$225
Round trip
2026-11-18 – 2026-11-25
PHX - St. Louis
83% AI deal score
$479
$229
Round trip
2026-10-06 – 2026-10-19
PHX - St. Louis
47% AI deal score
$222
$229
Round trip
2026-10-13 – 2026-11-02
PHX - St. Louis
46% AI deal score
$214
$229
Round trip
2026-10-20 – 2026-11-02
PHX - St. Louis
47% AI deal score
$222
$230
Round trip
2026-10-06 – 2026-10-30
PHX - St. Louis
46% AI deal score
$212
$231
Round trip
2026-10-13 – 2026-10-26
PHX - St. Louis
47% AI deal score
$222
$231
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 accounts for the fact that most itineraries on this route involve at least one stopover, making the total travel time significantly longer than a direct flight would be. For those planning to fly this route, understanding the full journey time is crucial for scheduling.

For travelers looking for cheap flights from Phoenix to St. Louis, prices typically range from $359–$647, with a median of $482. Right now, current fares are below the typical level, which could present an opportunity for savings. Approximately 7% of recent fares on this route have been classified as a good price, indicating that finding a lower fare is possible with careful planning.

When is the cheapest time to fly from Phoenix to St. Louis? The most affordable month to fly is typically August, with a median fare of just $185. Following closely, April also offers competitive prices, with a median fare of $228. March is another relatively inexpensive option, showing a median fare of $282, making these months prime times to consider for budget-conscious travel.

Most itineraries from Phoenix to St. Louis connect at least once, with only 0.1% of recent fares being non-stop. This means that if you fly this route, you will likely have a layover. For connecting itineraries, the typical number of stopovers is 2, which contributes to the overall journey time. New deals for this route appear almost daily, so frequent checking can help you find suitable options.

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

Regular price: $214 - $441

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 between $214 and $441. The current lowest deal is $169 with Frontier Airlines for travel from Oct 22-Oct 24.

now $169

Low $214

High $441

The cheapest time to fly from Phoenix to St. Louis

The cheapest month to fly from PHX to STL 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

Tue, Sep 15

⌛ Last-Minute

PHX - St. Louis

Phoenix (PHX) - St. Louis (STL)

Frontier Airlines

$468

$407

One-way

Tue, Sep 15

⌛ Last-Minute

PHX - St. Louis

Phoenix (PHX) - St. Louis (STL)

Frontier Airlines

$429

$408

One-way

Wed, Sep 16

⌛ Last-Minute

PHX - St. Louis

Phoenix (PHX) - St. Louis (STL)

Frontier Airlines

$436

$405

One-way

Wed, Sep 16

⌛ Last-Minute

PHX - St. Louis

Phoenix (PHX) - St. Louis (STL)

Frontier Airlines

$510

$407

One-way

Thu, Sep 17

⌛ Last-Minute

PHX - St. Louis

Phoenix (PHX) - St. Louis (STL)

Frontier Airlines

$452

$407

One-way

Thu, Sep 17

⌛ Last-Minute

PHX - St. Louis

Phoenix (PHX) - St. Louis (STL)

Frontier Airlines

$546

$408

One-way

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

7 nights

Nov 18 - Nov 25

$479 → $230

52%

2 nights

Nov 6 - Nov 8

$493 → $289

41%

3 nights

Sep 18 - Sep 21

$546 → $379

31%

3 nights

Nov 21 - Nov 24

$494 → $333

33%

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 for Phoenix to St. Louis are below the typical level at $169.

📅 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

Flights typically take 13h 5m

Flights from Phoenix to St. Louis typically take 13h 5m, covering a distance of 2027 km.

✈️ Airlines & availability

Connecting flights are dominant on this route

Connecting flights are dominant, with a median of 2 stopovers when connecting.

🏆 Airline highlight

Frontier Airlines offers the cheapest recent deal

The cheapest recent deal from Phoenix to St. Louis was $169 with Frontier Airlines.

🎯 Booking tip

Deals are frequent on this route

Deals on flights from Phoenix to St. Louis are frequent, appearing often over 30 days.

Phoenix main airports to depart from

Phoenix Sky Harbor International (PHX)

Cheapest

Phoenix Sky Harbor International Airport offers flights to St. Louis, with prices starting from $157.

📍 ~6 km from Phoenix city center (reachable by car or public transport).

💸 Flights from ~$157

St. Louis main airports to arrive at

St. Louis Lambert International (STL)

Cheapest

St. Louis Lambert International Airport is a convenient arrival choice for flights to St. Louis.

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

💸 Flights from ~$157

Airports nearby St. Louis used as alternative

MidAmerica St. Louis (BLV)

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

📍 ~45 km from St. Louis (reachable by car)

💸 Flights from ~$357

Business & First Class Flight Deals to St. Louis

Discover luxury on the budget with premium cabin class on flights from Phoenix to St. Louis.

Elite

Best Elite deals to St. Louis

Exclusive daily First Class, Business Class, and Premium Economy flight deals, refreshed every 24 hours.

From PHX

Elite

Sep 17

St. Louis, United States

82% AI deal score

$2,259

$1,292

Save $967

United Airlines

Business Class

From PHX

Elite

Nov 11

St. Louis, United States

80% AI deal score

$1,752

$1,135

Save $617

United Airlines

Business Class

From PHX

Elite

Oct 23

St. Louis, United States

80% AI deal score

$1,799

$1,165

Save $634

United Airlines

Business Class

From PHX

Elite

Oct 21

St. Louis, United States

80% AI deal score

$1,797

$1,165

Save $632

United Airlines

Business Class

From PHX

Elite

Sep 23

St. Louis, United States

80% AI deal score

$2,070

$1,291

Save $779

United Airlines

Business Class

From PHX

Elite

Nov 04

St. Louis, United States

79% AI deal score

$1,734

$1,164

Save $570

United Airlines

Business Class

From PHX

Elite

Oct 27

St. Louis, United States

79% AI deal score

$1,743

$1,165

Save $578

United Airlines

Business Class

From PHX

Elite

Oct 29

St. Louis, United States

79% AI deal score

$1,869

$1,195

Save $674

United Airlines

Business Class

From PHX

Elite

Oct 10

St. Louis, United States

79% AI deal score

$1,763

$1,197

Save $566

United Airlines

Business Class

From PHX

Elite

Oct 13

St. Louis, United States

78% AI deal score

$1,398

$925

Save $473

From PHX

Elite

Nov 25

St. Louis, United States

78% AI deal score

$1,764

$1,165

Save $599

United Airlines

Business Class

From PHX

Elite

Nov 19

St. Louis, United States

78% AI deal score

$1,812

$1,195

Save $617

United Airlines

Business Class

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 several weeks or months before your intended departure, can sometimes result in lower prices. However, prices can fluctuate, so monitoring fares over time may help you identify a good booking window. Weekday travel can also sometimes be more affordable.

Comparing nearby airports at both your origin and destination can sometimes uncover additional flight options or potentially lower fares. While it may require extra travel time to and from these airports, the savings could be worthwhile. Always factor in the total cost and convenience.

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

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

Regular price: $214 - $441

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 between $214 and $441. The current lowest deal is $169 with Frontier Airlines for travel from Oct 22-Oct 24.

now $169

Low $214

High $441

The cheapest time to fly from Phoenix to St. Louis

The cheapest month to fly from PHX to STL 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

Tue, Sep 15

⌛ Last-Minute

PHX - St. Louis

Phoenix (PHX) - St. Louis (STL)

Frontier Airlines

$468

$407

One-way

Tue, Sep 15

⌛ Last-Minute

PHX - St. Louis

Phoenix (PHX) - St. Louis (STL)

Frontier Airlines

$429

$408

One-way

Wed, Sep 16

⌛ Last-Minute

PHX - St. Louis

Phoenix (PHX) - St. Louis (STL)

Frontier Airlines

$436

$405

One-way

Wed, Sep 16

⌛ Last-Minute

PHX - St. Louis

Phoenix (PHX) - St. Louis (STL)

Frontier Airlines

$510

$407

One-way

Thu, Sep 17

⌛ Last-Minute

PHX - St. Louis

Phoenix (PHX) - St. Louis (STL)

Frontier Airlines

$452

$407

One-way

Thu, Sep 17

⌛ Last-Minute

PHX - St. Louis

Phoenix (PHX) - St. Louis (STL)

Frontier Airlines

$546

$408

One-way

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

7 nights

Nov 18 - Nov 25

$479 → $230

52%

2 nights

Nov 6 - Nov 8

$493 → $289

41%

3 nights

Sep 18 - Sep 21

$546 → $379

31%

3 nights

Nov 21 - Nov 24

$494 → $333

33%

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 for Phoenix to St. Louis are below the typical level at $169.

📅 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

Flights typically take 13h 5m

Flights from Phoenix to St. Louis typically take 13h 5m, covering a distance of 2027 km.

✈️ Airlines & availability

Connecting flights are dominant on this route

Connecting flights are dominant, with a median of 2 stopovers when connecting.

🏆 Airline highlight

Frontier Airlines offers the cheapest recent deal

The cheapest recent deal from Phoenix to St. Louis was $169 with Frontier Airlines.

🎯 Booking tip

Deals are frequent on this route

Deals on flights from Phoenix to St. Louis are frequent, appearing often over 30 days.

Phoenix main airports to depart from

Phoenix Sky Harbor International (PHX)

Cheapest

Phoenix Sky Harbor International Airport offers flights to St. Louis, with prices starting from $157.

📍 ~6 km from Phoenix city center (reachable by car or public transport).

💸 Flights from ~$157

St. Louis main airports to arrive at

St. Louis Lambert International (STL)

Cheapest

St. Louis Lambert International Airport is a convenient arrival choice for flights to St. Louis.

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

💸 Flights from ~$157

Airports nearby St. Louis used as alternative

MidAmerica St. Louis (BLV)

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

St. Louis, United States

78% AI deal score

$1,398

$925

Save $473

From PHX

Elite

Nov 25

St. Louis, United States

78% AI deal score

$1,764

$1,165

Save $599

United Airlines

Business Class

From PHX

Elite

Nov 19

St. Louis, United States

78% AI deal score

$1,812

$1,195

Save $617

United Airlines

Business Class

Frequently Asked Questions About Flights to St. Louis

Cheap Flights from Phoenix to St. Louis

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

Phoenix to St. Louis: Overview

Insights for flights from Phoenix to St. Louis

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

The cheapest time to fly from Phoenix to St. Louis

Direct flights from Phoenix to St. Louis

Last-minute flights going from Phoenix to St. Louis

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

Popular Airports to fly from Phoenix to St. Louis

Phoenix - St. Louis route insights

Recent fares are below the typical level

August is historically the cheapest month to fly

Flights typically take 13h 5m

Connecting flights are dominant on this route

Frontier Airlines offers the cheapest recent deal

Deals are frequent on this route

Phoenix main airports to depart from

St. Louis main airports to arrive at

Airports nearby St. Louis used as alternative

Business & First Class Flight Deals to St. Louis

Best Elite deals to St. Louis

Sep 17

Nov 11

Oct 23

Oct 21

Sep 23

Nov 04

Oct 27

Oct 29

Oct 10

Oct 13

Nov 25

Nov 19

Frequently Asked Questions About Flights to St. Louis

How can I find cheap flights from Phoenix to St. Louis?

When should I book flights from Phoenix to St. Louis?

Should I compare nearby airports for flights from Phoenix to St. Louis?

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

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

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

Related routes

More routes from Phoenix

Flights to St. Louis from other cities

Phoenix to St. Louis: Overview

Insights for flights from Phoenix to St. Louis

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

The cheapest time to fly from Phoenix to St. Louis

Direct flights from Phoenix to St. Louis

Last-minute flights going from Phoenix to St. Louis

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

Popular Airports to fly from Phoenix to St. Louis

Phoenix - St. Louis route insights

Recent fares are below the typical level

August is historically the cheapest month to fly

Flights typically take 13h 5m

Connecting flights are dominant on this route

Frontier Airlines offers the cheapest recent deal

Deals are frequent on this route

Phoenix main airports to depart from

St. Louis main airports to arrive at

Airports nearby St. Louis used as alternative

Business & First Class Flight Deals to St. Louis

Best Elite deals to St. Louis

Sep 17

Nov 11

Oct 23

Oct 21

Sep 23

Nov 04

Oct 27

Oct 29

Oct 10

Oct 13

Nov 25

Nov 19

Frequently Asked Questions About Flights to St. Louis

How can I find cheap flights from Phoenix to St. Louis?

When should I book flights from Phoenix to St. Louis?

Should I compare nearby airports for flights from Phoenix to St. Louis?