Route on-time record
JST to IAD: most on-time flights and the best time to fly
Johnstown (John Murtha Johnstown Cambria County Airport) to Dulles (Washington Dulles International Airport). 347 nonstop flights in Jun 2025 to May 2026, 74% arrived within 15 minutes and 3.2% were cancelled. The most reliable flight number was SkyWest 5046 at 6:38 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
JST → IAD
Johnstown to Dulles: 347 nonstop flights a year
On time (12 months)
74%
Cancelled
3.2%
avg delay 51 min
Best time to leave
No clear winner
Most reliable airline
SkyWest
71% chance on time
Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Most reliable nonstop flights
Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.
#1 · SkyWest 5046 · sold as United Express, Delta Connection, American Eagle or Alaska
6:38 AM → 7:35 AM57m nonstop
Local times, typical schedule. Last flown 2026-05-31.
70%
chance on time
- On time (history)
- 73%
- Cancelled
- 3.9%
- Avg arrival delay
- 53 min
- Arrived on time 73% of the time (274 flights, Jun 2025 to May 2026).
- Cancelled 3.9% of the time (11 of 285).
Strong track record · 274 flights
Find 6:38 AM flight fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- SkyWest Airlines (sold as United Express, Delta Connection, American Eagle or Alaska)71%
347 flights · 74% on time as flown · 3.2% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM74%
346 flights · avg delay 51 min
Best day: Saturday (82%). Worst: Monday (76%).
On time by month
All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.
What delays this route
- Late-arriving aircraft44%
- Airline (crew, maintenance, boarding)40%
- Severe weather11%
- Air traffic control and airport volume6%
Share of delay minutes by the cause airlines report to the US DOT.
Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure
JST to IAD questions
- Which airline is most on time from JST to IAD?
- SkyWest, with a season-adjusted 71% chance of operating and arriving on time over 347 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
- What is the worst month for delays on JST to IAD?
- December (71% on time); the best was May (88%), averaged over Jun 2023 to May 2026.
- Is this a prediction for my flight?
- No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.
More routes from JST
Live status: FAA delays and ground stops