PlainFlights

Route · BWI → STL · 2020–2025 BTS data

Baltimore to St. Louis

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), BWI to STL (Baltimore to St. Louis) ranks #1854 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

79.5%
On-time
+0.5 pts
vs US avg
58 min
Delay when late
6,816
Flights
#1854 of 4927
Corpus placement

Cancelled

0.9%

Best Month

Feb 2024 92%

Worst Month

Jul 2024 63%

Distance

738 mi

Carriers

1

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 101 24 2 0 WN
Nov 2025 107 13 1 0 WN
Oct 2025 106 19 0 0 WN
Sep 2025 117 11 0 0 WN
Aug 2025 129 19 2 0 WN
Jul 2025 127 33 4 0 WN
Jun 2025 124 28 1 1 WN
May 2025 127 34 2 1 WN
Apr 2025 123 23 0 0 WN
Mar 2025 106 20 2 0 WN
Feb 2025 71 11 0 0 WN
Jan 2025 74 10 6 0 WN
Dec 2024 99 20 0 1 WN
Nov 2024 104 12 0 0 WN
Oct 2024 119 11 0 0 WN
Sep 2024 115 18 0 0 WN
Aug 2024 124 39 1 0 WN
Jul 2024 145 54 0 1 WN
Jun 2024 124 33 0 0 WN
May 2024 115 36 0 1 WN
Apr 2024 111 25 0 0 WN
Mar 2024 108 22 0 0 WN
Feb 2024 83 7 0 0 WN
Jan 2024 93 21 4 0 WN

BWI–STL seasonal on-time pattern

Best: February (87.7%) · weakest: July (68.4%)

65%70%75%80%85%90% JanFebMarAprMayJunJulAugSepOctNovDec 74.4%

Strongest calendar month

February

87.7% on-time · ~71 flights/mo

Busiest calendar month

August

~113 flights/mo avg

Weakest calendar month

July

68.4% on-time · ~112 flights/mo

Cancellation Rate

0.9%

25 of 2,652 flights

Diversion Rate

0.2%

5 of 2,652 flights

Explore origin & destination

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

BWI - Baltimore

Full on-time, delay-cause, and seasonal performance for Baltimore, MD.

BWI 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 BWI and STL side by side on delays, cancellations, and reliability.

Compare BWI vs STL

Origin-hub reliability standing

Mid-pack among BWI departures

From BWI, this corridor sits with 53 other 75–85% on-time routes out of 64 tracked departures, not the hub's reliability leaders (0 at ≥85%) and not the softest ( 11 below 75%). Destination: St. Louis · fleet on-time rank #3331 of 4927.

What the Data Says About BWI to STL

6,816 tracked flights put the BWI to STL pairing (Baltimore to St. Louis) at a 79.5% on-time rate, squarely in line with the wider network. Delays that do occur run 57.6 minutes on average. Across the 738-mile route and its 1 carrier, the trailing 24 months show 0.9% cancelled and 0.2% diverted (2,652 flights sampled).

The monthly split is wide on this route: Feb 2024 posted the strongest performance at 92% on-time, while Jul 2024 came in at just 63% - a 29-point swing worth factoring into travel timing.

On the multi-year calendar, BWI–STL peaks in February at 87.7% on-time while August carries the heaviest traffic (~113 flights per month) ; the softest month is July at 68.4%, a 19.3-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does BWI to STL rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, BWI to STL ranks #1854 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 BWI to STL? ▼
Flights from Baltimore to St. Louis have a 79.5% on-time rate based on 6,816 flights. The average delay is 57.6 minutes. The best recent month was Feb 2024 with 92% on-time.
What is the cancellation rate for BWI to STL? ▼
Over the last 24 months, 0.9% of flights on this route were cancelled (25 of 2,652 flights) and 0.2% were diverted.
How far is the flight from BWI to STL? ▼
The flight distance from Baltimore (BWI) to St. Louis (STL) is approximately 738 miles. This route is served by 1 carrier.
When is the best time to fly from BWI to STL? ▼
The best recent month for on-time performance was Feb 2024 (92% on-time). The worst was Jul 2024 (63% on-time). Consider booking during months with historically better performance.

Airports on this route

BWI Airport

Baltimore
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 BWI–STL data

BWI–STL is mid-pack at 79.5% on-time; month and carrier mix move more than the corridor headline.

  • Compare BWI and STL airport profiles: delay causes and top routes differ even on the same corridor. BWI airport
  • If your dates flex, February (87.7% on-time) beats July (68.4%) on this corridor. Seasonal chart
  • 4 other routes post a similar 79.5% 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.