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.
RDU → IAD
Raleigh/Durham to Dulles: 1,335 nonstop flights a year
On time (12 months)
86%
Cancelled
1.4%
avg delay 11 min
Best time to leave
9 AM to noon
94% on time vs 76% 3 to 6 PM
Most reliable airline
United
85% chance on time
Lowest nonstop fare seen in the next two months: $225 (United 1789 on 2026-10-27). Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Best trips
5 nonstop. Best overall weighs the chance you arrive on time as booked, connection odds, travel time and separate tickets.
Best overall#1 · Nonstop · 1h 14m
10:38 AM → 11:52 AM
93%
arrive on time
94% on time · 0.8% cancel10:38 AM RDU → 11:52 AM IAD1h 14m
United 1535
Airbus A320 · 1–28 yrs oldFind United 1535 fares Opens this date on Aviasales#2 · Nonstop · 1h 13m
6:00 AM → 7:13 AM
92%
arrive on time
93% on time · 1.2% cancel6:00 AM RDU → 7:13 AM IAD1h 13m
United 1789
Boeing 737-700 or 737-900ER · 3–28 yrs oldFind United 1789 fares Opens this date on Aviasales#3 · Nonstop · 1h 13m
7:50 PM → 9:04 PM
83%
arrive on time
83% on time · 0.9% cancel7:50 PM RDU → 9:04 PM IAD1h 13m
United 2642
Airbus A319 or A320 · 19–28 yrs oldFind United 2642 fares Opens this date on Aviasales#4 · Nonstop · 1h 21m
7:45 PM → 9:06 PM
82%
arrive on time
83% on time · 1.6% cancel7:45 PM RDU → 9:06 PM IAD1h 21m
Republic 3520 · sold as American Eagle, Delta Connection or United Express
Embraer E175 · 3–9 yrs oldFind 7:45 PM flight fares Opens this date on Aviasales#5 · Nonstop · 1h 13m
3:02 PM → 4:15 PM
73%
arrive on time
75% on time · 2.4% cancel3:02 PM RDU → 4:15 PM IAD1h 13m
United 2463
Boeing 737-700 · 17–28 yrs oldFind United 2463 fares Opens this date on Aviasales
Aircraft and ages come from the planes each flight number actually flew in the last 3 months of data (FAA registry build years); airlines can swap planes.
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- United Airlines85%
1,065 flights · 87% on time as flown · 1.3% cancel
- Republic Airways (sold as American Eagle, Delta Connection or United Express)84%
270 flights · 85% on time as flown · 1.7% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM90%
333 flights · avg delay 5 min
- 9 AM to noon94%
358 flights · avg delay 5 min
- Noon to 3 PM92%
48 flights · avg delay 10 min
- 3 to 6 PM76%
320 flights · avg delay 19 min
- 6 to 9 PM84%
276 flights · avg delay 16 min
Best day: Saturday (91%). Worst: Monday (84%).
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