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Route · STL → BOS · 2020–2025 BTS data

St. Louis to Boston

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), STL to BOS (St. Louis to Boston) ranks #1734 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

78%
On-time
-1 pts
vs US avg
63 min
Delay when late
7,255
Flights
#1734 of 4927
Corpus placement

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

STL–BOS seasonal on-time pattern

Best: March (86.9%) · weakest: July (72.3%)

70%75%80%85%90% JanFebMarAprMayJunJulAugSepOctNovDec 79.1%

Strongest calendar month

March

86.9% on-time · ~104 flights/mo

Busiest calendar month

October

~131 flights/mo avg

Weakest calendar month

July

72.3% on-time · ~114 flights/mo

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.

STL on-time profile

BOS - Boston

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

BOS on-time profile

Compare the two airports

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

Compare STL vs BOS

Origin-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: Boston · fleet on-time rank #3852 of 4927.

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.

On the multi-year calendar, STL–BOS peaks in March at 86.9% on-time while October carries the heaviest traffic (~131 flights per month) ; the softest month is July at 72.3%, a 14.6-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does STL to BOS rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, STL to BOS ranks #1734 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 STL to BOS? ▼
Flights from St. Louis to Boston have a 78% on-time rate based on 7,255 flights. The average delay is 62.8 minutes. The best recent month was Apr 2025 with 88% on-time.
What is the cancellation rate for STL to BOS? ▼
Over the last 24 months, 1.3% of flights on this route were cancelled (40 of 3,189 flights) and 0.1% were diverted.
How far is the flight from STL to BOS? ▼
The flight distance from St. Louis (STL) to Boston (BOS) is approximately 1,047 miles. This route is served by 13 carriers.
When is the best time to fly from STL to BOS? ▼
The best recent month for on-time performance was Apr 2025 (88% on-time). The worst was Oct 2025 (54% on-time). Consider booking during months with historically better performance.

Airports on this route

STL Airport

St. Louis
BOS Airport

Boston
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–BOS data

STL–BOS is mid-pack at 78% on-time; month and carrier mix move more than the corridor headline.

  • Compare STL and BOS airport profiles: delay causes and top routes differ even on the same corridor. STL airport
  • If your dates flex, March (86.9% on-time) beats July (72.3%) on this corridor. Seasonal chart
  • 4 other routes post a similar 78% 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.