PlainFlights

Route · STL → PHX · 2020–2025 BTS data

St. Louis to Phoenix

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), STL to PHX (St. Louis to Phoenix) ranks #927 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

81.9%
On-time
+2.9 pts
vs US avg
77 min
Delay when late
11,786
Flights
#927 of 4927
Corpus placement

Cancelled

0.5%

Best Month

Sep 2024 88%

Worst Month

Jul 2024 67%

Distance

1,262 mi

Carriers

18

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 206 60 0 0 WN,F9,AA
Nov 2025 187 55 1 0 F9,AA,WN
Oct 2025 200 50 0 1 AA,OO,WN,F9
Sep 2025 160 35 2 2 WN,OO,AA
Aug 2025 165 42 0 0 AA,OO,WN
Jul 2025 166 39 0 0 AA,OO,WN
Jun 2025 169 46 0 1 AA,OO,WN
May 2025 209 46 2 0 AA,OO,WN
Apr 2025 207 45 0 0 OO,WN,AA
Mar 2025 181 37 0 0 AA,OO,WN
Feb 2025 180 28 0 0 AA,OO,WN
Jan 2025 194 28 11 0 AA,WN
Dec 2024 215 37 0 1 AA,OO,WN
Nov 2024 207 30 0 0 OO,MQ,WN,AA
Oct 2024 204 29 0 0 WN,AA
Sep 2024 176 21 1 0 WN,AA
Aug 2024 187 37 1 1 AA,F9,WN
Jul 2024 210 70 0 1 AA,F9,WN
Jun 2024 209 52 1 0 AA,F9,MQ,WN
May 2024 218 67 0 0 AA,F9,MQ,WN
Apr 2024 205 35 1 0 AA,F9,WN
Mar 2024 190 43 0 0 AA,WN
Feb 2024 172 25 0 0 AA,OO,WN
Jan 2024 190 42 4 0 AA,MQ,WN,OO

STL–PHX seasonal on-time pattern

Best: September (87.9%) · weakest: July (75.3%)

70%75%80%85%90% JanFebMarAprMayJunJulAugSepOctNovDec 79.4%

Strongest calendar month

September

87.9% on-time · ~148 flights/mo

Busiest calendar month

March

~178 flights/mo avg

Weakest calendar month

July

75.3% on-time · ~160 flights/mo

Cancellation Rate

0.5%

24 of 4,607 flights

Diversion Rate

0.2%

7 of 4,607 flights

Explore origin & destination

On-time and delay data for the airports this route connects.

STL - St. Louis

Full on-time, delay-cause, and seasonal performance for St. Louis, MO.

STL on-time profile

PHX - Phoenix

Full on-time, delay-cause, and seasonal performance for Phoenix, AZ.

PHX on-time profile

Compare the two airports

See STL and PHX side by side on delays, cancellations, and reliability.

Compare STL vs PHX

Origin-hub reliability standing

Mid-pack among STL departures

From STL, this corridor sits with 45 other 75–85% on-time routes out of 51 tracked departures, not the hub's reliability leaders (5 at ≥85%) and not the softest ( 1 below 75%). Destination: Phoenix · fleet on-time rank #2422 of 4927.

What the Data Says About STL to PHX

11,786 tracked flights put the STL to PHX pairing (St. Louis to Phoenix) at a 81.9% on-time rate, squarely in line with the wider network. Delays that do occur run 77.4 minutes on average. Across the 1,262-mile route and its 18 carriers, the trailing 24 months show 0.5% cancelled and 0.2% diverted (4,607 flights sampled).

The monthly split is wide on this route: Sep 2024 posted the strongest performance at 88% on-time, while Jul 2024 came in at just 67% - a 21-point swing worth factoring into travel timing.

On the multi-year calendar, STL–PHX peaks in September at 87.9% on-time while March carries the heaviest traffic (~178 flights per month) ; the softest month is July at 75.3%, a 12.6-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does STL to PHX rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, STL to PHX ranks #927 of 4927 tracked domestic routes by total flights (most flights = #1). That ordinal matches our busiest-routes listing (total_flights DESC). See /methodology#corpus-placement for the exact sort basis.
How often are flights delayed from STL to PHX? ▼
Flights from St. Louis to Phoenix have a 81.9% on-time rate based on 11,786 flights. The average delay is 77.4 minutes. The best recent month was Sep 2024 with 88% on-time.
What is the cancellation rate for STL to PHX? ▼
Over the last 24 months, 0.5% of flights on this route were cancelled (24 of 4,607 flights) and 0.2% were diverted.
How far is the flight from STL to PHX? ▼
The flight distance from St. Louis (STL) to Phoenix (PHX) is approximately 1,262 miles. This route is served by 18 carriers.
When is the best time to fly from STL to PHX? ▼
The best recent month for on-time performance was Sep 2024 (88% on-time). The worst was Jul 2024 (67% on-time). Consider booking during months with historically better performance.

Airports on this route

STL Airport

St. Louis
PHX Airport

Phoenix
Data source

Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.

Read our methodology - how this data is sourced, computed, and verified.

Using STL–PHX data

STL–PHX is mid-pack at 81.9% on-time; month and carrier mix move more than the corridor headline.

  • Compare STL and PHX airport profiles: delay causes and top routes differ even on the same corridor. STL airport
  • If your dates flex, September (87.9% on-time) beats July (75.3%) on this corridor. Seasonal chart
  • 4 other routes post a similar 81.9% on-time rate; compare before you commit to this pairing. Similar routes

On-time rate reflects the BTS historical average across all reporting carriers on this origin–destination pair, not any single flight or booking recommendation.

Data sourced from U.S. Department of Transportation Bureau of Transportation Statistics (BTS) On-Time Performance data. See our methodology for details. Retrieved and formatted by PlainFlights

Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.