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Route · CHS → BOS · 2020–2025 BTS data

Charleston to Boston

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), CHS to BOS (Charleston to Boston) ranks #2134 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

75.3%
On-time
-3.7 pts
vs US avg
94 min
Delay when late
5,870
Flights
#2134 of 4927
Corpus placement

Cancelled

1.7%

Best Month

Oct 2024 92%

Worst Month

Sep 2025 51%

Distance

818 mi

Carriers

16

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 99 25 1 0 DL,YX,B6
Nov 2025 93 20 3 0 DL,B6,YX
Oct 2025 99 47 0 0 B6,YX,DL
Sep 2025 97 48 0 0 DL,B6
Aug 2025 94 24 1 0 B6,DL
Jul 2025 93 37 3 0 B6,DL
Jun 2025 94 32 0 0 B6,DL
May 2025 120 44 2 1 B6,DL,NK
Apr 2025 152 39 0 0 DL,NK,YX,B6
Mar 2025 121 28 2 0 B6,YX,DL
Feb 2025 78 14 5 0 B6,YX,DL
Jan 2025 74 9 4 0 B6,YX,DL
Dec 2024 91 32 1 0 B6,DL,YX
Nov 2024 75 14 0 0 B6,DL
Oct 2024 96 8 0 0 DL,NK,B6
Sep 2024 120 21 1 0 B6,DL,NK
Aug 2024 132 45 6 1 B6,DL,NK
Jul 2024 121 41 6 0 B6,DL,NK
Jun 2024 136 33 1 3 B6,DL,NK
May 2024 150 43 0 0 B6,DL,NK
Apr 2024 110 23 3 0 B6,DL,NK
Mar 2024 93 18 0 0 B6,DL
Feb 2024 73 15 1 0 B6,DL
Jan 2024 62 14 2 0 B6,DL

CHS–BOS seasonal on-time pattern

Best: November (82.5%) · weakest: September (69.2%)

65%70%75%80%85% JanFebMarAprMayJunJulAugSepOctNovDec 70.3%

Strongest calendar month

November

82.5% on-time · ~70 flights/mo

Busiest calendar month

May

~120 flights/mo avg

Weakest calendar month

September

69.2% on-time · ~96 flights/mo

Cancellation Rate

1.7%

42 of 2,473 flights

Diversion Rate

0.2%

5 of 2,473 flights

Explore origin & destination

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

CHS - Charleston

Full on-time, delay-cause, and seasonal performance for Charleston, SC.

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

Compare CHS vs BOS

Origin-hub reliability standing

Mid-pack among CHS departures

From CHS, this corridor sits with 18 other 75–85% on-time routes out of 21 tracked departures, not the hub's reliability leaders (3 at ≥85%) and not the softest ( 0 below 75%). Destination: Boston · fleet on-time rank #4417 of 4927.

What the Data Says About CHS to BOS

The Charleston to Boston corridor (CHS to BOS) posts a 75.3% on-time rate on the lower edge of the average band, based on 5,870 tracked flights. Late flights run 94.3 minutes behind on average. 16 carriers cover the 818-mile route; over the last 24 months, 42 of 2,473 flights were cancelled (1.7%) and 0.2% diverted.

The monthly split is wide on this route: Oct 2024 posted the strongest performance at 92% on-time, while Sep 2025 came in at just 51% - a 41-point swing worth factoring into travel timing.

On the multi-year calendar, CHS–BOS peaks in November at 82.5% on-time while May carries the heaviest traffic (~120 flights per month) ; the softest month is September at 69.2%, a 13.3-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does CHS to BOS rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, CHS to BOS ranks #2134 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 CHS to BOS? ▼
Flights from Charleston to Boston have a 75.3% on-time rate based on 5,870 flights. The average delay is 94.3 minutes. The best recent month was Oct 2024 with 92% on-time.
What is the cancellation rate for CHS to BOS? ▼
Over the last 24 months, 1.7% of flights on this route were cancelled (42 of 2,473 flights) and 0.2% were diverted.
How far is the flight from CHS to BOS? ▼
The flight distance from Charleston (CHS) to Boston (BOS) is approximately 818 miles. This route is served by 16 carriers.
When is the best time to fly from CHS to BOS? ▼
The best recent month for on-time performance was Oct 2024 (92% on-time). The worst was Sep 2025 (51% on-time). Consider booking during months with historically better performance.

Airports on this route

CHS Airport

Charleston
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 CHS–BOS data

CHS–BOS is mid-pack at 75.3% on-time; month and carrier mix move more than the corridor headline.

  • Compare CHS and BOS airport profiles: delay causes and top routes differ even on the same corridor. CHS airport
  • If your dates flex, November (82.5% on-time) beats September (69.2%) on this corridor. Seasonal chart
  • 4 other routes post a similar 75.3% 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.