Route profile
IAD→CHS
Flight reliability, delays and best times to fly from Washington to Charleston, 441 miles.
Right now
Aviation weather is not currently a factor.
Aviation weather is not currently a factor.
Route reliability
July 2023 – July 2026
Better than 92% of comparable major US routes (4,598 compared)
Calculated from 2,294 flights. How this is calculated · What counts as on time
IAD → CHS arrives on time 88.2% of the time; the return trip, CHS → IAD, arrives on time 88.3% of the time.
IAD → CHS spends 28.7 minutes on the ground on a 441-mile trip: 20.2 minutes from pushback to wheels-up at IAD and 8.5 minutes from touchdown to gate at CHS.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
What stands out
This route stays close to typical even on its worst days, a smaller gap than 96% of 4,598 comparable routes.
A typical arrival is 9 min early, and the worst tenth are only 27 minutes worse than that.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · Ranked against every other route with the same kind of figure and at least 4,598 in the comparison.
What sets this route apart
Where IAD to CHS differs most from similar routes by hour, weekday, month and airline, July 2023 – July 2026.
IAD to CHS is at its best against routes of similar length for flights scheduled at 1 PM: 89.8% arrive on time, 11.2 points ahead of the 78.6% those routes manage at that hour. Against all other routes the gap is 12.7 points.
IAD to CHS holds up on Sundays better than routes of similar length do: 88.7% on time to their 75.0%, a 13.7 points lead. Against all other routes the gap is 13.9 points.
June is kinder to IAD to CHS than to routes of similar length: 92.2% on time against 73.3%, 18.9 points better. Against all other routes the gap is 19.5 points.
United Airlines does better on IAD to CHS than on its routes of similar length: 88.8% on time here, 77.9% there, 10.9 points apart. Against all other routes the gap is 8.9 points.
IAD to CHS against comparable routes
July 2023 – July 2026| Measure | This route | Compared with | Them | Gap | Flights behind it |
|---|---|---|---|---|---|
| Hour: 1 PM departures | 89.8% | routes of similar length | 78.6% | +11.2 pts | 443 here, 89,731 there |
| Weekday: Sunday | 88.7% | routes of similar length | 75.0% | +13.7 pts | 318 here, 227,290 there |
| Month: June | 92.2% | routes of similar length | 73.3% | +18.9 pts | 179 here, 126,869 there |
| Airline: United Airlines | 88.8% | routes of similar length | 77.9% | +10.9 pts | 1,069 here, 113,249 there |
Each comparison pools the flights of other routes, with this route’s own left out. Similar length means within 15% of this route’s 441 miles, with at least 5 such routes. A bucket is set against the most comparable group that has enough flights: similar length, then the same origin (at least 3 routes), then all other routes. Hours, weekdays and months appear only where both sides have 120 completed flights, and airlines where both have 600. The gap must be at least 2 points and 2 standard errors, and only the largest gap each way is kept per measure. These are differences in the flights counted, not causes.
When it goes wrong
July 2023 – July 2026
18 min late
against a median of 9 min early
Percentiles over 2,294 operations; cancelled and diverted flights are counted separately.
Will your connection be tight enough?
Layovers at CHS after arriving from IAD.
| Connection time | Chance of missing | Reads as |
|---|---|---|
| 30 min | 25% | High risk |
| 45 min | 11% | Some risk |
| 60 min | 6.7% | Some risk |
| 90 min | 3.4% | Low risk |
| 120 min | 2.3% | Low risk |
This is one leg of a connection. Gate changes and the next flight's own schedule matter too. And a connection can fail before delay is even the question — this route cancels 1.18% of the time and diverts 0.09% of the time, which a late arrival never shows up in.
Chance of missing is the share of 2,265 arrivals on this route that landed later than the connection time less 30 minutes to reach the next gate.
The worst tenth of arrivals on this route land at least 18 minutes late (90th-percentile gate arrival delay), over 2,294 operations.
Any other layover length: connection checker.
Best time to fly
IAD → CHS flights departing 5–9 AM arrived on time 91.0% of the time, against 72.9% for 3–6 PM departures, a gap of 18.1 percentage points.
By departure window
By departure hour
- 12 AM to 7 AM: too few flights to score
- 8 AM: 91.0% on time from 1,021 flights
- 9 AM to 11 AM: too few flights to score
- 12 PM: 88.2% on time from 566 flights
- 1 PM: 89.8% on time from 449 flights
- 2 PM to 4 PM: too few flights to score
- 5 PM: 72.9% on time from 200 flights
- 6 PM to 11 PM: too few flights to score
Departure windows with fewer than 120 flights are not scored.
Why IAD → CHS runs late
July 2023 – July 2026
crew, maintenance, boarding and fueling, all within the carrier’s control
the inbound aircraft was late, so this flight started late
airspace and airport capacity, including weather-driven flow control
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for IAD → CHS. Only delays of 15 minutes or more are attributed. What the five causes mean
Airlines on this route
Carriers with at least 200 flights, by the airline that operated each one.
| Carrier | Flights | On time | Cancelled | Median delay | Severe |
|---|---|---|---|---|---|
| Republic Airways | 1,216 | 87.7% | 1.48% | -10 min | 3.4% |
| United Airlines | 1,078 | 88.8% | 0.83% | -8 min | 3.5% |
Republic Airways flew 53.0% of the 2,294 flights listed.
Carriers on this route performed within a couple of percentage points of each other.
Flights on this route
Flight numbers with at least 600 operations here and still on the schedule.
| Flight | Scheduled | Operations | On time |
|---|---|---|---|
| YX3487 Republic Airways | 12:40 PM | 810 | 89.5% |
Weekly and seasonal patterns
By day of week
Wednesday is historically the most reliable day and Friday the least, a gap of 5.0 percentage points.
By month
- Jan: 78.5%
- Feb: 92.1%
- Mar: 91.4%
- Apr: 89.6%
- May: 87.3%
- Jun: 92.2%
- Jul: 83.6%
- Aug: 89.3%
- Sep: 86.3%
- Oct: 92.4%
- Nov: 91.2%
- Dec: 84.2%
January is historically the weakest month and October the strongest, a spread of 13.9 percentage points.
Reliability over time
July 2023 – July 2026
Over the most recent 12 months (2025-08 to 2026-07), on-time arrivals averaged 86.7% against 89.5% in the 12 months before — declining by 2.8 percentage points.
Data and methodology
Calculated by FlyerIntel from 2,294 IAD → CHS flight records from the US DOT Bureau of Transportation Statistics, covering July 2023 – July 2026. Late means 15 or more minutes past scheduled arrival; cancelled and diverted flights are left out of on-time rates.
Full methodology · Data sources · Report a problem
Related research: How Long a Layover Needs to Be · Two Airlines on One Route · Best Time of Day to Fly From Major US Airports
Analysis last recomputed