ATIS Alerts Smart Flight Search
Find the flight least likely to be delayed
BetaWe rank real flight numbers by how often they flew and arrived on time over the last 12 months, adjusted for your travel month and departure time, then check nearby airports and calmer connections. US airlines and airports.
DEN → IAD
Denver to Dulles: 3,622 nonstop flights a year
On time (12 months)
79%
Cancelled
0.7%
avg delay 14 min
Best time to leave
After 9 PM
93% on time vs 49% 6 to 9 PM
Most reliable airline
United
83% chance on time
Lowest nonstop fare seen in the next two months: $251 (United 1887 on 2026-11-11). 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 1101
7:45 AM → 1:14 PM3h 26m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 286; its record covers all of them.
94%
chance on time
- On time (history)
- 96%
- Cancelled
- 0.3%
- Avg arrival delay
- 3 min
- Arrived on time 96% of the time (289 flights, Jun 2025 to May 2026).
- Departs outside DEN's trouble window (2 PM to 8 PM, when 79% of its 174 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.
Strong track record · 289 flights
Find United 1101 fares Opens this date on Aviasales#2 · United 1279
6:00 AM → 11:29 AM3h 28m nonstop
Local times, typical schedule. Last flown 2026-05-31.
94%
chance on time
- On time (history)
- 96%
- Cancelled
- 0.0%
- Avg arrival delay
- 4 min
- Arrived on time 96% of the time (116 flights, Jun 2025 to May 2026).
- Never cancelled in 116 scheduled flights.
- Departs outside DEN's trouble window (2 PM to 8 PM, when 79% of its 174 ground stops and delay programs started).
Moderate track record · 116 flights
Find United 1279 fares Opens this date on Aviasales#3 · United 1924
11:59 PM → 5:28 AM3h 29m nonstop
Local times, typical schedule. Last flown 2026-05-31.
92%
chance on time
- On time (history)
- 93%
- Cancelled
- 1.2%
- Avg arrival delay
- 5 min
- Arrived on time 93% of the time (336 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (After 9 PM: 93% on time; 6 to 9 PM: 49%).
- Departs outside DEN's trouble window (2 PM to 8 PM, when 79% of its 174 ground stops and delay programs started).
Strong track record · 336 flights
Find United 1924 fares Opens this date on Aviasales#4 · United 2853
12:05 PM → 5:32 PM3h 27m nonstop
Local times, typical schedule. Last flown 2026-05-31.
89%
chance on time
- On time (history)
- 91%
- Cancelled
- 0.0%
- Avg arrival delay
- 4 min
- Arrived on time 91% of the time (100 flights, Jun 2025 to May 2026).
- Never cancelled in 100 scheduled flights.
- Departs outside DEN's trouble window (2 PM to 8 PM, when 79% of its 174 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 · 100 flights
Find United 2853 fares Opens this date on Aviasales#5 · United 687
11:22 AM → 4:40 PM3h 18m nonstop
Local times, typical schedule. Last flown 2026-03-28.
86%
chance on time
- On time (history)
- 89%
- Cancelled
- 0.0%
- Avg arrival delay
- 9 min
- Arrived on time 89% of the time (45 flights, Jun 2025 to May 2026).
- Never cancelled in 45 scheduled flights.
- Departs outside DEN's trouble window (2 PM to 8 PM, when 79% of its 174 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.
Limited track record · 45 flights
Find United 687 fares Opens this date on Aviasales#6 · United 1877
11:15 AM → 4:46 PM3h 31m nonstop
Local times, typical schedule. Last flown 2026-04-29.
84%
chance on time
- On time (history)
- 91%
- Cancelled
- 0.0%
- Avg arrival delay
- 10 min
- Arrived on time 91% of the time (32 flights, Jun 2025 to May 2026).
- Never cancelled in 32 scheduled flights.
- Departs outside DEN's trouble window (2 PM to 8 PM, when 79% of its 174 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.
Limited track record · 32 flights
Find United 1877 fares Opens this date on Aviasales#7 · United 347
1:30 PM → 7:00 PM3h 30m nonstop
Local times, typical schedule. Last flown 2026-05-31.
84%
chance on time
- On time (history)
- 85%
- Cancelled
- 1.3%
- Avg arrival delay
- 16 min
- Arrived on time 85% of the time (306 flights, Jun 2025 to May 2026).
- Departs outside DEN's trouble window (2 PM to 8 PM, when 79% of its 174 ground stops and delay programs started).
Strong track record · 306 flights
Find United 347 fares Opens this date on Aviasales#8 · United 421
3:50 PM → 9:22 PM3h 32m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 798; its record covers all of them.
81%
chance on time
- On time (history)
- 81%
- Cancelled
- 0.3%
- Avg arrival delay
- 17 min
- Arrived on time 81% of the time (347 flights, Jun 2025 to May 2026).
- Departs inside DEN's trouble window: 79% of its 174 ground stops and delay programs started between 2 PM and 8 PM.
Strong track record · 347 flights
Find United 421 fares Opens this date on Aviasales#9 · United 2087
10:15 AM → 3:46 PM3h 31m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 326; its record covers all of them.
78%
chance on time
- On time (history)
- 78%
- Cancelled
- 0.5%
- Avg arrival delay
- 11 min
- Arrived on time 78% of the time (358 flights, Jun 2025 to May 2026).
- Departs outside DEN's trouble window (2 PM to 8 PM, when 79% of its 174 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.
Strong track record · 358 flights
Find United 2087 fares Opens this date on Aviasales#10 · United 2408
5:59 PM → 11:34 PM3h 35m nonstop
Local times, typical schedule. Last flown 2026-05-31.
68%
chance on time
- On time (history)
- 69%
- Cancelled
- 1.1%
- Avg arrival delay
- 25 min
- Arrived on time 69% of the time (359 flights, Jun 2025 to May 2026).
- Departs inside DEN's trouble window: 79% of its 174 ground stops and delay programs started between 2 PM and 8 PM.
Strong track record · 359 flights
Find United 2408 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- United Airlines83%
2,785 flights · 84% on time as flown · 0.6% cancel
- Southwest Airlines65%
837 flights · 64% on time as flown · 1.0% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM92%
702 flights · avg delay 4 min
- 9 AM to noon78%
896 flights · avg delay 11 min
- Noon to 3 PM83%
507 flights · avg delay 14 min
- 3 to 6 PM72%
876 flights · avg delay 23 min
- 6 to 9 PM49%
299 flights · avg delay 35 min
- After 9 PM93%
342 flights · avg delay 5 min
Best day: Wednesday (81%). Worst: Thursday (77%).
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