Route profile
CHS→IAD
Flight reliability, delays and best times to fly from Charleston to Washington, 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 87% of comparable major US routes (4,598 compared)
Calculated from 2,290 flights. How this is calculated · What counts as on time
CHS → IAD arrives on time 88.3% of the time; the return trip, IAD → CHS, arrives on time 88.2% of the time.
CHS → IAD spends 25.1 minutes on the ground on a 441-mile trip: 17.0 minutes from pushback to wheels-up at CHS and 8.1 minutes from touchdown to gate at IAD.
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 94% of 4,598 comparable routes.
A typical arrival is 10 min early, and the worst tenth are only 29 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 CHS to IAD differs most from similar routes by hour, weekday, month and airline, July 2023 – July 2026.
CHS to IAD is at its best against routes of similar length for flights scheduled at 7 PM: 82.5% arrive on time, 14.4 points ahead of the 68.1% those routes manage at that hour. Against all other routes the gap is 14.7 points.
CHS to IAD holds up on Thursdays better than routes of similar length do: 90.4% on time to their 77.1%, a 13.3 points lead. Against all other routes the gap is 13.6 points.
June is kinder to CHS to IAD than to routes of similar length: 92.7% on time against 73.3%, 19.4 points better. Against all other routes the gap is 20 points.
United Airlines does better on CHS to IAD than on its routes of similar length: 90.2% on time here, 77.8% there, 12.4 points apart. Against all other routes the gap is 10.3 points.
CHS to IAD against comparable routes
July 2023 – July 2026| Measure | This route | Compared with | Them | Gap | Flights behind it |
|---|---|---|---|---|---|
| Hour: 7 PM departures | 82.5% | routes of similar length | 68.1% | +14.4 pts | 166 here, 87,373 there |
| Weekday: Thursday | 90.4% | routes of similar length | 77.1% | +13.3 pts | 324 here, 232,335 there |
| Month: June | 92.7% | routes of similar length | 73.3% | +19.4 pts | 179 here, 126,869 there |
| Airline: United Airlines | 90.2% | routes of similar length | 77.8% | +12.4 pts | 1,138 here, 113,180 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
19 min late
against a median of 10 min early
Percentiles over 2,290 operations; cancelled and diverted flights are counted separately.
Will your connection be tight enough?
Layovers at IAD after arriving from CHS.
| Connection time | Chance of missing | Reads as |
|---|---|---|
| 30 min | 23% | High risk |
| 45 min | 11% | Some risk |
| 60 min | 7.7% | Some risk |
| 90 min | 5.0% | Some risk |
| 120 min | 3.5% | 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 0.13% of the time, which a late arrival never shows up in.
Chance of missing is the share of 2,260 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 19 minutes late (90th-percentile gate arrival delay), over 2,290 operations.
Any other layover length: connection checker.
Best time to fly
CHS → IAD flights departing 9 AM–12 PM arrived on time 93.6% of the time, against 82.5% for 6–9 PM departures, a gap of 11.1 percentage points.
By departure window
By departure hour
- 12 AM to 8 AM: too few flights to score
- 9 AM: 91.1% on time from 250 flights
- 10 AM: 94.4% on time from 786 flights
- 11 AM to 1 PM: too few flights to score
- 2 PM: 83.6% on time from 1,003 flights
- 3 PM to 6 PM: too few flights to score
- 7 PM: 82.5% on time from 176 flights
- 8 PM to 11 PM: too few flights to score
Departure windows with fewer than 120 flights are not scored.
Why CHS → IAD runs late
July 2023 – July 2026
the inbound aircraft was late, so this flight started late
airspace and airport capacity, including weather-driven flow control
crew, maintenance, boarding and fueling, all within the carrier’s control
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for CHS → IAD. Only delays of 15 minutes or more are attributed. What the five causes mean
Late-arriving aircraft is the largest cause on CHS → IAD, at 57.5%: flights here mostly leave late because the plane came in late, and the day shows it: 9 AM–12 PM departures arrived on time 93.6% of the time and 6–9 PM departures 82.5%.
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 |
|---|---|---|---|---|---|
| United Airlines | 1,146 | 90.2% | 0.70% | -11 min | 4.6% |
| Republic Airways | 1,144 | 86.3% | 1.66% | -10 min | 5.6% |
United Airlines flew 50.0% of the 2,290 flights listed.
United Airlines arrived on time 3.9 percentage points more often than Republic Airways on this route.
Flights on this route
Flight numbers with at least 600 operations here and still on the schedule.
| Flight | Scheduled | Operations | On time |
|---|---|---|---|
| YX3401 Republic Airways | 2:44 PM | 772 | 85.4% |
Weekly and seasonal patterns
By day of week
Thursday is historically the most reliable day and Sunday the least, a gap of 4.4 percentage points.
By month
- Jan: 80.0%
- Feb: 92.0%
- Mar: 84.7%
- Apr: 89.1%
- May: 89.5%
- Jun: 92.7%
- Jul: 85.5%
- Aug: 87.4%
- Sep: 90.5%
- Oct: 94.1%
- Nov: 90.6%
- Dec: 84.3%
January is historically the weakest month and October the strongest, a spread of 14.1 percentage points.
Reliability over time
July 2023 – July 2026
Over the most recent 12 months (2025-08 to 2026-07), on-time arrivals averaged 84.8% against 90.5% in the 12 months before — declining by 5.7 percentage points.
Data and methodology
Calculated by FlyerIntel from 2,290 CHS → IAD 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