Reliable Flight Search
BetaThe insider way to pick a flight: on-time records, the odds each connection is made, legroom and the age of the planes that actually fly the route. Things airline sites and the big booking sites don’t show you. US airlines and airports.
IAD → RDU
Dulles to Raleigh/Durham: 1,334 nonstop flights a year
On time (12 months)
83%
Cancelled
1.3%
avg delay 13 min
Best time to leave
Before 9 AM
91% on time vs 77% 3 to 6 PM
Most reliable airline
United
84% chance on time
Lowest nonstop fare seen in the next two months: $240 (United 2382 on 2026-10-24). Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Best trips
6 nonstop · ranked by overall best · published legroom for 0 of 6
Top pick#1 · Nonstop · 1h 16m
8:16 AM → 9:32 AM
84
score
93%
arrive on time
94% on time · 0.8% cancel8:16 AM IAD → 9:32 AM RDU1h 16m
United 1536
Boeing 737 MAX 8 or 737 MAX 9 · 1–27 yrs oldLegroom: not published for this aircraft and cabin yetFind United 1536 fares Opens this date on Aviasales#2 · Nonstop · 1h 09m
8:25 AM → 9:34 AM
64
score
90%
arrive on time
91% on time · 0.9% cancel8:25 AM IAD → 9:34 AM RDU1h 09m
United 635
Airbus A320 · 12–28 yrs oldLegroom: not published for this aircraft and cabin yetFind United 635 fares Opens this date on Aviasales#3 · Nonstop · 1h 13m
12:53 PM → 2:06 PM
47
score
84%
arrive on time
86% on time · 1.5% cancel12:53 PM IAD → 2:06 PM RDU1h 13m
United 1357
Boeing 737-700 · 17–28 yrs oldLegroom: not published for this aircraft and cabin yetFind United 1357 fares Opens this date on Aviasales#4 · Nonstop · 1h 17m
5:32 PM → 6:50 PM
30
score
78%
arrive on time
79% on time · 0.9% cancel5:32 PM IAD → 6:50 PM RDU1h 17m
United 1322
Airbus A319 or A320 · 15–28 yrs oldLegroom: not published for this aircraft and cabin yetFind United 1322 fares Opens this date on Aviasales#5 · Nonstop · 1h 25m
5:30 PM → 6:55 PM
30
score
73%
arrive on time
75% on time · 2.4% cancel5:30 PM IAD → 6:55 PM RDU1h 25m
Republic 3624 · sold as American Eagle, Delta Connection or United Express
Embraer E175 · 3–9 yrs oldLegroom: not published for this aircraft and cabin yetFind 5:30 PM flight fares Opens this date on Aviasales#6 · Nonstop · 1h 13m
10:31 PM → 11:44 PM
26
score
77%
arrive on time
77% on time · 0.7% cancel10:31 PM IAD → 11:44 PM RDU1h 13m
United 2382
Boeing 737-700 or 737-900ER · 3–28 yrs oldLegroom: not published for this aircraft and cabin yetFind United 2382 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. Legroom is the seat pitch the airline or a seat-map source publishes for that aircraft and cabin; we never estimate it, and seat maps change, so check the airline’s seat map when you book.
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- United Airlines84%
1,064 flights · 85% on time as flown · 1.1% cancel
- Republic Airways (sold as American Eagle, Delta Connection or United Express)78%
270 flights · 78% on time as flown · 2.1% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM91%
319 flights · avg delay 4 min
- Noon to 3 PM86%
319 flights · avg delay 10 min
- 3 to 6 PM77%
361 flights · avg delay 24 min
- After 9 PM81%
335 flights · avg delay 13 min
Best day: Tuesday (87%). Worst: Sunday (81%).
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