Route · STL → BOS · 2020–2025 BTS data
St. Louis to Boston
The STL–BOS corridor (St. Louis, MO → Boston, MA) runs behind the national average, served by 13 carriers across roughly 1,047 miles.
Data updated 2026-06-13
- 78%
- On-time
- -1 pts
- vs US avg
- 63 min
- Delay when late
- 7,255
- Flights
Cancelled
1.3%
Best Month
Apr 2025 88%
Worst Month
Oct 2025 54%
Distance
1,047 mi
Carriers
13
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 146 | 29 | 1 | 0 | YX,WN,MQ |
| Nov 2025 | 140 | 33 | 2 | 0 | MQ,WN,YX |
| Oct 2025 | 150 | 69 | 1 | 0 | WN,YX,MQ |
| Sep 2025 | 142 | 42 | 1 | 0 | MQ,WN,YX |
| Aug 2025 | 145 | 23 | 0 | 0 | WN,MQ |
| Jul 2025 | 149 | 51 | 3 | 0 | WN,MQ |
| Jun 2025 | 146 | 45 | 1 | 1 | WN,YX,MQ |
| May 2025 | 149 | 42 | 1 | 0 | WN,YX,MQ |
| Apr 2025 | 139 | 17 | 0 | 0 | MQ,WN,YX |
| Mar 2025 | 117 | 18 | 0 | 0 | WN,YX,MQ |
| Feb 2025 | 90 | 15 | 1 | 0 | WN,YX,MQ |
| Jan 2025 | 102 | 16 | 9 | 0 | WN,YX,MQ |
| Dec 2024 | 131 | 27 | 2 | 0 | MQ,WN,YX |
| Nov 2024 | 131 | 23 | 0 | 0 | MQ,WN,YX |
| Oct 2024 | 149 | 31 | 0 | 0 | MQ,WN |
| Sep 2024 | 142 | 29 | 0 | 0 | WN,MQ |
| Aug 2024 | 144 | 46 | 6 | 0 | MQ,WN |
| Jul 2024 | 145 | 38 | 1 | 0 | MQ,WN |
| Jun 2024 | 138 | 36 | 2 | 0 | MQ,WN |
| May 2024 | 142 | 49 | 0 | 0 | MQ,WN,YX |
| Apr 2024 | 123 | 19 | 0 | 1 | MQ,WN,YX |
| Mar 2024 | 113 | 22 | 0 | 0 | MQ,WN |
| Feb 2024 | 104 | 14 | 2 | 0 | MQ,WN |
| Jan 2024 | 112 | 36 | 7 | 1 | MQ,WN |
Cancellation Rate
1.3%
40 of 3,189 flights
Diversion Rate
0.1%
3 of 3,189 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.
Origin airport →BOS - Boston
Full on-time, delay-cause, and seasonal performance for Boston, MA.
Destination airport →Compare the two airports
See STL and BOS side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to STL–BOS.
Routes with a similar on-time rate
What the Data Says About STL to BOS
The St. Louis to Boston corridor (STL to BOS) posts a 78% on-time rate on the lower edge of the average band, based on 7,255 tracked flights. Late flights run 62.8 minutes behind on average. 13 carriers cover the 1,047-mile route; over the last 24 months, 40 of 3,189 flights were cancelled (1.3%) and 0.1% diverted.
The monthly split is wide on this route: Apr 2025 posted the strongest performance at 88% on-time, while Oct 2025 came in at just 54% - a 34-point swing worth factoring into travel timing.
Frequently Asked Questions
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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.
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.