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Route · PHL → STL · 2020–2025 BTS data

Philadelphia to St. Louis

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), PHL to STL (Philadelphia to St. Louis) ranks #1482 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

82%
On-time
+3 pts
vs US avg
73 min
Delay when late
8,263
Flights
#1482 of 4927
Corpus placement

Cancelled

1.6%

Best Month

Nov 2024 89%

Worst Month

Jun 2025 63%

Distance

814 mi

Carriers

29

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 150 53 1 1 YX,OH,WN,AA
Nov 2025 163 32 2 0 OH,AA,WN,YX
Oct 2025 147 27 0 0 AA,WN,YX
Sep 2025 132 28 0 0 WN,AA
Aug 2025 142 39 0 0 AA,WN,YX
Jul 2025 135 50 3 0 AA,WN,YX
Jun 2025 132 49 2 0 AA,OH,WN,YX
May 2025 118 24 2 0 AA,OH,WN
Apr 2025 115 24 0 1 OH,WN,AA
Mar 2025 105 22 1 1 OH,WN
Feb 2025 78 18 3 0 OH,WN,YX
Jan 2025 91 17 10 0 OH,WN,YX
Dec 2024 132 26 0 0 AA,OH,WN,YX
Nov 2024 130 14 0 0 WN,YX,OH,AA
Oct 2024 187 22 0 0 WN,YX,AA,OH
Sep 2024 172 28 0 0 WN,YX,AA
Aug 2024 201 50 7 0 AA,F9,WN,YX
Jul 2024 198 65 10 1 AA,F9,WN,YX
Jun 2024 184 39 5 1 AA,F9,WN,YX
May 2024 119 31 2 0 AA,F9,WN
Apr 2024 85 20 0 0 AA,WN
Mar 2024 81 18 0 0 AA,WN
Feb 2024 62 9 0 0 AA,WN
Jan 2024 73 26 1 0 AA,WN

PHL–STL seasonal on-time pattern

Best: October (87.1%) · weakest: July (73.0%)

70%75%80%85%90% JanFebMarAprMayJunJulAugSepOctNovDec 78%

Strongest calendar month

October

87.1% on-time · ~123 flights/mo

Busiest calendar month

August

~141 flights/mo avg

Weakest calendar month

July

73.0% on-time · ~136 flights/mo

Cancellation Rate

1.6%

49 of 3,132 flights

Diversion Rate

0.2%

5 of 3,132 flights

Explore origin & destination

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

PHL - Philadelphia

Full on-time, delay-cause, and seasonal performance for Philadelphia, PA.

PHL on-time profile

STL - St. Louis

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

STL on-time profile

Compare the two airports

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

Compare PHL vs STL

Origin-hub reliability standing

Mid-pack among PHL departures

From PHL, this corridor sits with 60 other 75–85% on-time routes out of 65 tracked departures, not the hub's reliability leaders (4 at ≥85%) and not the softest ( 1 below 75%). Destination: St. Louis · fleet on-time rank #2364 of 4927.

What the Data Says About PHL to STL

Bureau of Transportation Statistics records show Philadelphia to St. Louis (PHL to STL) running a 82% on-time rate over 8,263 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 73.1 minutes. The 814-mile corridor is served by 29 carriers, and over the last 24 months 1.6% of 3,132 flights were cancelled, 0.2% diverted.

The monthly split is wide on this route: Nov 2024 posted the strongest performance at 89% on-time, while Jun 2025 came in at just 63% - a 26-point swing worth factoring into travel timing.

On the multi-year calendar, PHL–STL peaks in October at 87.1% on-time while August carries the heaviest traffic (~141 flights per month) ; the softest month is July at 73.0%, a 14.1-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does PHL to STL rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, PHL to STL ranks #1482 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 PHL to STL? ▼
Flights from Philadelphia to St. Louis have a 82% on-time rate based on 8,263 flights. The average delay is 73.1 minutes. The best recent month was Nov 2024 with 89% on-time.
What is the cancellation rate for PHL to STL? ▼
Over the last 24 months, 1.6% of flights on this route were cancelled (49 of 3,132 flights) and 0.2% were diverted.
How far is the flight from PHL to STL? ▼
The flight distance from Philadelphia (PHL) to St. Louis (STL) is approximately 814 miles. This route is served by 29 carriers.
When is the best time to fly from PHL to STL? ▼
The best recent month for on-time performance was Nov 2024 (89% on-time). The worst was Jun 2025 (63% on-time). Consider booking during months with historically better performance.

Airports on this route

PHL Airport

Philadelphia
STL Airport

St. Louis
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 PHL–STL data

PHL–STL runs 3 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.

  • Compare PHL and STL airport profiles: delay causes and top routes differ even on the same corridor. PHL airport
  • If your dates flex, October (87.1% on-time) beats July (73.0%) on this corridor. Seasonal chart
  • 4 other routes post a similar 82% 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.