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Route · BOS → STL · 2020–2025 BTS data

Boston to St. Louis

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), BOS to STL (Boston to St. Louis) ranks #1737 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

82.8%
On-time
+3.8 pts
vs US avg
68 min
Delay when late
7,253
Flights
#1737 of 4927
Corpus placement

Cancelled

1.3%

Best Month

Feb 2024 96%

Worst Month

Oct 2025 65%

Distance

1,047 mi

Carriers

13

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 146 41 1 0 YX,WN,MQ
Nov 2025 142 21 1 0 MQ,WN,YX
Oct 2025 150 52 1 1 WN,YX,MQ
Sep 2025 142 40 2 0 MQ,WN,YX
Aug 2025 145 27 0 0 WN,MQ
Jul 2025 149 39 2 2 WN,MQ
Jun 2025 146 42 2 0 WN,YX,MQ
May 2025 149 22 1 1 WN,YX,MQ
Apr 2025 139 23 0 0 MQ,WN,YX
Mar 2025 117 17 0 0 WN,YX,MQ
Feb 2025 88 16 3 0 WN,YX,MQ
Jan 2025 102 16 11 0 WN,YX,MQ
Dec 2024 131 17 2 0 MQ,WN,YX
Nov 2024 131 12 0 0 MQ,WN,YX
Oct 2024 148 22 0 0 MQ,WN
Sep 2024 142 24 0 0 WN,MQ
Aug 2024 144 32 5 0 MQ,WN
Jul 2024 145 42 0 1 MQ,WN
Jun 2024 138 27 2 0 MQ,WN
May 2024 142 33 0 0 MQ,WN,YX
Apr 2024 123 22 0 0 MQ,WN,YX
Mar 2024 115 12 0 0 MQ,WN
Feb 2024 112 5 1 0 MQ,WN
Jan 2024 120 20 7 1 MQ,WN

BOS–STL seasonal on-time pattern

Best: November (88.8%) · weakest: July (76.5%)

75%80%85%90% JanFebMarAprMayJunJulAugSepOctNovDec 82.6%

Strongest calendar month

November

88.8% on-time · ~124 flights/mo

Busiest calendar month

October

~131 flights/mo avg

Weakest calendar month

July

76.5% on-time · ~114 flights/mo

Cancellation Rate

1.3%

41 of 3,206 flights

Diversion Rate

0.2%

6 of 3,206 flights

Explore origin & destination

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

BOS - Boston

Full on-time, delay-cause, and seasonal performance for Boston, MA.

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

Compare BOS vs STL

Origin-hub reliability standing

Mid-pack among BOS departures

From BOS, this corridor sits with 49 other 75–85% on-time routes out of 60 tracked departures, not the hub's reliability leaders (6 at ≥85%) and not the softest ( 5 below 75%). Destination: St. Louis · fleet on-time rank #2022 of 4927.

What the Data Says About BOS to STL

Bureau of Transportation Statistics records show Boston to St. Louis (BOS to STL) running a 82.8% on-time rate over 7,253 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 67.6 minutes. The 1,047-mile corridor is served by 13 carriers, and over the last 24 months 1.3% of 3,206 flights were cancelled, 0.2% diverted.

The monthly split is wide on this route: Feb 2024 posted the strongest performance at 96% on-time, while Oct 2025 came in at just 65% - a 30-point swing worth factoring into travel timing.

On the multi-year calendar, BOS–STL peaks in November at 88.8% on-time while October carries the heaviest traffic (~131 flights per month) ; the softest month is July at 76.5%, a 12.3-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does BOS to STL rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, BOS to STL ranks #1737 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 BOS to STL? ▼
Flights from Boston to St. Louis have a 82.8% on-time rate based on 7,253 flights. The average delay is 67.6 minutes. The best recent month was Feb 2024 with 96% on-time.
What is the cancellation rate for BOS to STL? ▼
Over the last 24 months, 1.3% of flights on this route were cancelled (41 of 3,206 flights) and 0.2% were diverted.
How far is the flight from BOS to STL? ▼
The flight distance from Boston (BOS) to St. Louis (STL) is approximately 1,047 miles. This route is served by 13 carriers.
When is the best time to fly from BOS to STL? ▼
The best recent month for on-time performance was Feb 2024 (96% on-time). The worst was Oct 2025 (65% on-time). Consider booking during months with historically better performance.

Airports on this route

BOS Airport

Boston
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 BOS–STL data

BOS–STL runs 3.8 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.

  • Compare BOS and STL airport profiles: delay causes and top routes differ even on the same corridor. BOS airport
  • If your dates flex, November (88.8% on-time) beats July (76.5%) on this corridor. Seasonal chart
  • 4 other routes post a similar 82.8% 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.