Route on-time record
ORD to IAD: most on-time flights and the best time to fly
Chicago (Chicago O'Hare International Airport) to Dulles (Washington Dulles International Airport). 2,021 nonstop flights in Jun 2025 to May 2026, 72% arrived within 15 minutes and 0.6% were cancelled. The most reliable flight number was United 2277 at 8:45 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
ORD → IAD
Chicago to Dulles: 2,021 nonstop flights a year
On time (12 months)
72%
Cancelled
0.6%
avg delay 21 min
Best time to leave
9 AM to noon
85% on time vs 52% 3 to 6 PM
Most reliable airline
United
72% chance on time
Lowest nonstop fare seen in the next two months: $147 (United 1055 on 2026-11-17). 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 · United 2277
8:45 AM → 11:48 AM2h 03m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 1357; its record covers all of them.
83%
chance on time
- On time (history)
- 84%
- Cancelled
- 1.3%
- Avg arrival delay
- 10 min
- Arrived on time 84% of the time (232 flights, Jun 2025 to May 2026).
- Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).
Strong track record · 232 flights
Find United 2277 fares Opens this date on Aviasales#2 · United 1869
11:03 AM → 2:08 PM2h 05m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 1355; its record covers all of them.
81%
chance on time
- On time (history)
- 88%
- Cancelled
- 0.0%
- Avg arrival delay
- 10 min
- Arrived on time 88% of the time (32 flights, Jun 2025 to May 2026).
- Never cancelled in 32 scheduled flights.
- Leaves in this route's most on-time window (9 AM to noon: 85% on time; 3 to 6 PM: 52%).
- Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).
Limited track record · 32 flights
Find United 1869 fares Opens this date on Aviasales#3 · United 1689
6:30 AM → 9:24 AM1h 54m nonstop
Local times, typical schedule. Last flown 2026-05-31.
79%
chance on time
- On time (history)
- 100%
- Cancelled
- 0.0%
- Avg arrival delay
- 0 min
- Arrived on time 100% of the time (10 flights, Jun 2025 to May 2026).
- Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).
- Short track record (10 flights), so its score leans on the airline's record at this hour.
Limited track record · 10 flights
Find United 1689 fares Opens this date on Aviasales#4 · United 1015
9:55 PM → 12:59 AM2h 04m nonstop
Local times, typical schedule. Last flown 2026-05-31.
75%
chance on time
- On time (history)
- 100%
- Cancelled
- 0.0%
- Avg arrival delay
- 0 min
- Arrived on time 100% of the time (11 flights, Jun 2025 to May 2026).
- Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).
- Short track record (11 flights), so its score leans on the airline's record at this hour.
Limited track record · 11 flights
Find United 1015 fares Opens this date on Aviasales#5 · United 2052
9:35 PM → 12:33 AM1h 58m nonstop
Local times, typical schedule. Last flown 2026-05-20. Same departure also flew as United 1892; its record covers all of them.
73%
chance on time
- On time (history)
- 79%
- Cancelled
- 0.0%
- Avg arrival delay
- 32 min
- Arrived on time 79% of the time (53 flights, Jun 2025 to May 2026).
- Never cancelled in 53 scheduled flights.
- Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).
- Short track record (53 flights), so its score leans on the airline's record at this hour.
Limited track record · 53 flights
Find United 2052 fares Opens this date on Aviasales#6 · United 293
1:00 PM → 4:03 PM2h 03m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 2128; its record covers all of them.
71%
chance on time
- On time (history)
- 73%
- Cancelled
- 1.4%
- Avg arrival delay
- 16 min
- Arrived on time 73% of the time (142 flights, Jun 2025 to May 2026).
- Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).
- Lands inside IAD's trouble window: 75% of its 63 ground stops and delay programs started between 1 PM and 7 PM.
Moderate track record · 142 flights
Find United 293 fares Opens this date on Aviasales#7 · United 587
2:25 PM → 5:30 PM2h 03m nonstop
Local times, typical schedule. Last flown 2026-05-20.
69%
chance on time
- On time (history)
- 71%
- Cancelled
- 0.4%
- Avg arrival delay
- 18 min
- Arrived on time 71% of the time (221 flights, Jun 2025 to May 2026).
- Departs inside ORD's trouble window: 44% of its 243 ground stops and delay programs started between 2 PM and 8 PM.
- Lands inside IAD's trouble window: 75% of its 63 ground stops and delay programs started between 1 PM and 7 PM.
Strong track record · 221 flights
Find United 587 fares Opens this date on Aviasales#8 · United 2223
6:01 PM → 9:04 PM2h 03m nonstop
Local times, typical schedule. Last flown 2026-04-29.
66%
chance on time
- On time (history)
- 66%
- Cancelled
- 0.0%
- Avg arrival delay
- 39 min
- Arrived on time 66% of the time (32 flights, Jun 2025 to May 2026).
- Never cancelled in 32 scheduled flights.
- Departs inside ORD's trouble window: 44% of its 243 ground stops and delay programs started between 2 PM and 8 PM.
- 58% of its delay minutes came from the plane arriving late from an earlier flight.
Limited track record · 32 flights
Find United 2223 fares Opens this date on Aviasales#9 · United 488
9:15 PM → 11:59 PM1h 44m nonstop
Local times, typical schedule. Last flown 2026-03-28.
65%
chance on time
- On time (history)
- 53%
- Cancelled
- 5.6%
- Avg arrival delay
- 36 min
- Arrived on time 53% of the time (17 flights, Jun 2025 to May 2026).
- Departs outside ORD's trouble window (2 PM to 8 PM, when 44% of its 243 ground stops and delay programs started).
- Short track record (17 flights), so its score leans on the airline's record at this hour.
Limited track record · 17 flights
Find United 488 fares Opens this date on Aviasales#10 · United 2437
4:20 PM → 7:23 PM2h 03m nonstop
Local times, typical schedule. Last flown 2026-05-31.
63%
chance on time
- On time (history)
- 64%
- Cancelled
- 0.0%
- Avg arrival delay
- 34 min
- Arrived on time 64% of the time (64 flights, Jun 2025 to May 2026).
- Never cancelled in 64 scheduled flights.
- Leaves in this route's least on-time window (3 to 6 PM: 52% on time; 9 AM to noon: 85%).
- Departs inside ORD's trouble window: 44% of its 243 ground stops and delay programs started between 2 PM and 8 PM.
Moderate track record · 64 flights
Find United 2437 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- United Airlines72%
2,021 flights · 72% on time as flown · 0.6% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM85%
377 flights · avg delay 12 min
- 9 AM to noon85%
211 flights · avg delay 9 min
- Noon to 3 PM71%
719 flights · avg delay 19 min
- 3 to 6 PM52%
236 flights · avg delay 48 min
- 6 to 9 PM67%
195 flights · avg delay 27 min
- After 9 PM69%
283 flights · avg delay 25 min
Best day: Tuesday (79%). Worst: Sunday (74%).
Smarter routing
Nearby airports that run more on time
MDW → BWI 77% chance on time
Chicago Midway International Airport to Baltimore/Washington International Thurgood Marshall Airport · 1,856 flights a year · 60 mi from your airports · yours: 72%
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 aircraft36%
- Airline (crew, maintenance, boarding)33%
- Air traffic control and airport volume24%
- Severe weather6%
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
ORD to IAD questions
- What time of day is best to fly ORD to IAD?
- 9 AM to noon: 85% of flights arrived on time, against 52% for departures 3 to 6 PM.
- Which airline is most on time from ORD to IAD?
- United, with a season-adjusted 72% chance of operating and arriving on time over 2,021 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 ORD to IAD?
- July (63% on time); the best was October (83%), 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 ORD
- IAD to ORD (return)
- ORD to LGA 67%
- ORD to BOS 68%
- ORD to LAX 74%
- ORD to DFW 70%
- ORD to DCA 69%
- ORD to MCO 73%
- ORD to ATL 74%
- ORD to MSP 69%
- ORD to DEN 74%
- ORD to IAH 75%
- ORD to EWR 69%
- ORD to DTW 71%
Live status: FAA delays and ground stops