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Route · IAD → CHS · 2020–2025 BTS data

Washington to Charleston

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), IAD to CHS (Washington to Charleston) ranks #2775 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

85.8%
On-time
+6.8 pts
vs US avg
71 min
Delay when late
4,289
Flights
#2775 of 4927
Corpus placement

Cancelled

1.0%

Best Month

Mar 2024 100%

Worst Month

Dec 2025 75%

Distance

441 mi

Carriers

11

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 57 14 1 0 YX,UA
Nov 2025 61 6 0 0 UA,YX
Oct 2025 51 4 0 0 UA,YX
Sep 2025 50 3 0 0 UA,YX
Aug 2025 58 7 0 0 YX,UA
Jul 2025 63 10 1 0 UA,YX
Jun 2025 60 8 0 0 UA,YX
May 2025 66 13 0 0 UA,YX
Apr 2025 76 8 0 0 UA,YX
Mar 2025 68 4 0 0 YX,UA
Feb 2025 56 3 1 0 UA,YX
Jan 2025 62 11 9 0 YX
Dec 2024 62 8 0 0 UA,YX
Nov 2024 59 2 0 0 YX,UA
Oct 2024 62 2 0 0 UA,YX
Sep 2024 60 4 0 0 YX,UA
Aug 2024 62 4 2 0 YX,UA
Jul 2024 62 6 1 0 UA,YX
Jun 2024 60 2 0 0 UA,YX
May 2024 65 3 0 0 YX,UA
Apr 2024 57 5 0 0 YX
Mar 2024 62 0 0 0 YX
Feb 2024 56 5 0 0 YX
Jan 2024 59 13 0 1 YX

IAD–CHS seasonal on-time pattern

Best: March (90.9%) · weakest: July (76.9%)

75%80%85%90%95% JanFebMarAprMayJunJulAugSepOctNovDec 84.1%

Strongest calendar month

March

90.9% on-time · ~62 flights/mo

Busiest calendar month

August

~73 flights/mo avg

Weakest calendar month

July

76.9% on-time · ~66 flights/mo

Cancellation Rate

1.0%

15 of 1,454 flights

Diversion Rate

0.1%

1 of 1,454 flights

Explore origin & destination

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

IAD - Washington

Full on-time, delay-cause, and seasonal performance for Washington, DC.

IAD on-time profile

CHS - Charleston

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

CHS on-time profile

Compare the two airports

See IAD and CHS side by side on delays, cancellations, and reliability.

Compare IAD vs CHS

Origin-hub reliability standing

Among IAD's stronger departures

IAD → CHS posts a 85.8% on-time rate, landing in the ≥85% band with 14 of 58 BTS-tracked routes leaving Washington. The same hub also shows 42 mid-band and 2 challenged departures · fleet-wide on-time rank #957 of 4927 (highest on-time = #1).

What the Data Says About IAD to CHS

Washington to Charleston (IAD to CHS) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 85.8% on-time rate across 4,289 flights, with delays that do happen averaging 71.3 minutes. The corridor runs roughly 441 miles and is served by 11 carriers. Over the most recent 24 months, 15 of 1,454 flights were cancelled (1.0%) and 1 diverted (0.1%).

The monthly split is wide on this route: Mar 2024 posted the strongest performance at 100% on-time, while Dec 2025 came in at just 75% - a 25-point swing worth factoring into travel timing.

On the multi-year calendar, IAD–CHS peaks in March at 90.9% on-time while August carries the heaviest traffic (~73 flights per month) ; the softest month is July at 76.9%, a 14.0-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does IAD to CHS rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, IAD to CHS ranks #2775 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 IAD to CHS? ▼
Flights from Washington to Charleston have a 85.8% on-time rate based on 4,289 flights. The average delay is 71.3 minutes. The best recent month was Mar 2024 with 100% on-time.
What is the cancellation rate for IAD to CHS? ▼
Over the last 24 months, 1.0% of flights on this route were cancelled (15 of 1,454 flights) and 0.1% were diverted.
How far is the flight from IAD to CHS? ▼
The flight distance from Washington (IAD) to Charleston (CHS) is approximately 441 miles. This route is served by 11 carriers.
When is the best time to fly from IAD to CHS? ▼
The best recent month for on-time performance was Mar 2024 (100% on-time). The worst was Dec 2025 (75% on-time). Consider booking during months with historically better performance.

Airports on this route

IAD Airport

Washington
CHS Airport

Charleston
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 IAD–CHS data

IAD–CHS runs 6.8 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.

  • Compare IAD and CHS airport profiles: delay causes and top routes differ even on the same corridor. IAD airport
  • If your dates flex, March (90.9% on-time) beats July (76.9%) on this corridor. Seasonal chart
  • 4 other routes post a similar 85.8% 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.