Route on-time record
SEA to RDU: most on-time flights and the best time to fly
Seattle (Seattle–Tacoma International Airport) to Raleigh/Durham (Raleigh-Durham International Airport). 919 nonstop flights in Jun 2025 to May 2026, 77% arrived within 15 minutes and 1.1% were cancelled. The most reliable flight number was Alaska 1529 at 8:22 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
SEA → RDU
Seattle to Raleigh/Durham: 919 nonstop flights a year
On time (12 months)
77%
Cancelled
1.1%
avg delay 11 min
Best time to leave
9 AM to noon
85% on time vs 68% after 9 PM
Most reliable airline
Alaska
78% chance on time
Lowest nonstop fare seen in the next two months: $449 (Alaska 572 on 2026-10-25). 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 · Alaska 1529
8:22 AM → 4:48 PM5h 26m nonstop
Local times, typical schedule. Last flown 2026-05-12.
84%
chance on time
- On time (history)
- 95%
- Cancelled
- 0.0%
- Avg arrival delay
- 1 min
- Arrived on time 95% of the time (21 flights, Jun 2025 to May 2026).
- Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).
- Lands inside RDU's trouble window: 57% of its 14 ground stops and delay programs started between 11 AM and 5 PM.
Limited track record · 21 flights
Find Alaska 1529 fares Opens this date on Aviasales#2 · Alaska 572
9:07 AM → 5:10 PM5h 03m nonstop
Local times, typical schedule. Last flown 2026-05-31.
82%
chance on time
- On time (history)
- 82%
- Cancelled
- 0.6%
- Avg arrival delay
- 8 min
- Arrived on time 82% of the time (341 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (9 AM to noon: 85% on time; After 9 PM: 68%).
- Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).
Strong track record · 341 flights
Find Alaska 572 fares Opens this date on Aviasales#3 · Alaska 677
9:56 PM → 6:10 AM5h 11m nonstop
Local times, typical schedule. Last flown 2026-05-12.
78%
chance on time
- On time (history)
- 85%
- Cancelled
- 0.0%
- Avg arrival delay
- 8 min
- Arrived on time 85% of the time (66 flights, Jun 2025 to May 2026).
- Never cancelled in 66 scheduled flights.
- Leaves in this route's least on-time window (After 9 PM: 68% on time; 9 AM to noon: 85%).
- Departs inside SEA's trouble window: 54% of its 68 ground stops and delay programs started between 4 PM and 10 PM.
Moderate track record · 66 flights
Find Alaska 677 fares Opens this date on Aviasales#4 · Alaska 335
10:13 PM → 6:22 AM5h 09m nonstop
Local times, typical schedule. Last flown 2026-05-31.
75%
chance on time
- On time (history)
- 74%
- Cancelled
- 0.0%
- Avg arrival delay
- 13 min
- Arrived on time 74% of the time (19 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (After 9 PM: 68% on time; 9 AM to noon: 85%).
- Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).
Limited track record · 19 flights
Find Alaska 335 fares Opens this date on Aviasales#5 · Delta 489
3:55 PM → 11:46 PM4h 58m nonstop
Local times, typical schedule. Last flown 2026-05-31.
75%
chance on time
- On time (history)
- 76%
- Cancelled
- 1.4%
- Avg arrival delay
- 12 min
- Arrived on time 76% of the time (354 flights, Jun 2025 to May 2026).
- Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).
Strong track record · 354 flights
Find Delta 489 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Alaska Airlines78%
555 flights · 78% on time as flown · 0.9% cancel
- Delta Air Lines75%
364 flights · 76% on time as flown · 1.3% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM79%
135 flights · avg delay 9 min
- 9 AM to noon85%
229 flights · avg delay 8 min
- 3 to 6 PM76%
349 flights · avg delay 12 min
- After 9 PM68%
206 flights · avg delay 13 min
Best day: Tuesday (86%). 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
- Airline (crew, maintenance, boarding)43%
- Late-arriving aircraft28%
- Air traffic control and airport volume27%
- Severe weather1%
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
SEA to RDU questions
- What time of day is best to fly SEA to RDU?
- 9 AM to noon: 85% of flights arrived on time, against 68% for departures after 9 PM.
- Which airline is most on time from SEA to RDU?
- Alaska, with a season-adjusted 78% chance of operating and arriving on time over 555 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 SEA to RDU?
- June (73% on time); the best was November (87%), 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 SEA
- RDU to SEA (return)
- SEA to LAX 83%
- SEA to PHX 79%
- SEA to SFO 69%
- SEA to ANC 74%
- SEA to DEN 77%
- SEA to LAS 77%
- SEA to ORD 75%
- SEA to GEG 81%
- SEA to DFW 77%
- SEA to PDX 82%
- SEA to SAN 78%
- SEA to SMF 81%
Most on-time flights from SEA on every route →
Live status: FAA delays and ground stops