Route · STL → BWI · 2020–2025 BTS data
St. Louis to Baltimore
According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), STL to BWI (St. Louis to Baltimore) ranks #1836 of 4927 tracked domestic routes by total flights (most flights = #1).
Data updated 2026-06-13
- 82.6%
- On-time
- +3.6 pts
- vs US avg
- 57 min
- Delay when late
- 6,869
- Flights
- #1836 of 4927
- Corpus placement
Cancelled
1.2%
Best Month
Feb 2024 95%
Worst Month
Jul 2024 65%
Distance
738 mi
Carriers
1
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 101 | 19 | 1 | 0 | WN |
| Nov 2025 | 107 | 19 | 0 | 0 | WN |
| Oct 2025 | 109 | 16 | 0 | 0 | WN |
| Sep 2025 | 116 | 24 | 0 | 0 | WN |
| Aug 2025 | 129 | 18 | 2 | 0 | WN |
| Jul 2025 | 127 | 34 | 3 | 0 | WN |
| Jun 2025 | 125 | 32 | 1 | 1 | WN |
| May 2025 | 129 | 29 | 2 | 0 | WN |
| Apr 2025 | 125 | 26 | 1 | 0 | WN |
| Mar 2025 | 104 | 17 | 1 | 0 | WN |
| Feb 2025 | 73 | 8 | 1 | 0 | WN |
| Jan 2025 | 73 | 9 | 6 | 0 | WN |
| Dec 2024 | 99 | 16 | 0 | 0 | WN |
| Nov 2024 | 104 | 14 | 0 | 0 | WN |
| Oct 2024 | 119 | 12 | 0 | 0 | WN |
| Sep 2024 | 115 | 14 | 0 | 0 | WN |
| Aug 2024 | 124 | 24 | 2 | 0 | WN |
| Jul 2024 | 145 | 51 | 0 | 0 | WN |
| Jun 2024 | 124 | 21 | 1 | 0 | WN |
| May 2024 | 124 | 27 | 0 | 0 | WN |
| Apr 2024 | 117 | 18 | 2 | 0 | WN |
| Mar 2024 | 104 | 18 | 0 | 0 | WN |
| Feb 2024 | 75 | 4 | 0 | 0 | WN |
| Jan 2024 | 85 | 6 | 9 | 0 | WN |
STL–BWI seasonal on-time pattern
Best: February (90.2%) · weakest: July (72.3%)
Strongest calendar month
February
90.2% on-time · ~74 flights/mo
Busiest calendar month
July
~112 flights/mo avg
Weakest calendar month
July
72.3% on-time · ~112 flights/mo
Cancellation Rate
1.2%
32 of 2,653 flights
Diversion Rate
0.0%
1 of 2,653 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 profileBWI - Baltimore
Full on-time, delay-cause, and seasonal performance for Baltimore, MD.
BWI on-time profileCompare the two airports
See STL and BWI side by side on delays, cancellations, and reliability.
Compare STL vs BWIOrigin-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: Baltimore · fleet on-time rank #2120 of 4927.
Similar routes
Other BTS-tracked routes with comparable performance or trip length to STL–BWI.
Routes with a similar on-time rate
What the Data Says About STL to BWI
Bureau of Transportation Statistics records show St. Louis to Baltimore (STL to BWI) running a 82.6% on-time rate over 6,869 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 57.3 minutes. The 738-mile corridor is served by 1 carrier, and over the last 24 months 1.2% of 2,653 flights were cancelled, 0.0% diverted.
The monthly split is wide on this route: Feb 2024 posted the strongest performance at 95% on-time, while Jul 2024 came in at just 65% - a 30-point swing worth factoring into travel timing.
On the multi-year calendar, STL–BWI peaks in February at 90.2% on-time while July carries the heaviest traffic (~112 flights per month) ; the softest month is July at 72.3%, a 17.9-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.
Frequently Asked Questions
Where does STL to BWI rank among US routes by traffic? ▼
How often are flights delayed from STL to BWI? ▼
What is the cancellation rate for STL to BWI? ▼
How far is the flight from STL to BWI? ▼
When is the best time to fly from STL to BWI? ▼
Airports on this route
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–BWI data
STL–BWI runs 3.6 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.
- Compare STL and BWI airport profiles: delay causes and top routes differ even on the same corridor. STL airport
- If your dates flex, February (90.2% on-time) beats July (72.3%) on this corridor. Seasonal chart
- 4 other routes post a similar 82.6% 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.
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.