Route on-time record
JFK to SEA: most on-time flights and the best time to fly
New York (John F. Kennedy International Airport) to Seattle (Seattle–Tacoma International Airport). 2,906 nonstop flights in Jun 2025 to May 2026, 68% arrived within 15 minutes and 2.6% were cancelled. The most reliable flight number was Delta 1719 at 11:25 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
JFK → SEA
New York to Seattle: 2,906 nonstop flights a year
On time (12 months)
68%
Cancelled
2.6%
avg delay 20 min
Best time to leave
9 AM to noon
81% on time vs 57% 6 to 9 PM
Most reliable airline
Delta
70% chance on time
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 · Delta 1719
11:25 AM → 2:30 PM6h 05m nonstop
Local times, typical schedule. Last flown 2026-05-31.
81%
chance on time
- On time (history)
- 87%
- Cancelled
- 1.8%
- Avg arrival delay
- 6 min
- Arrived on time 87% of the time (55 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (9 AM to noon: 81% on time; 6 to 9 PM: 57%).
- Departs outside JFK's trouble window (1 PM to 7 PM, when 66% of its 167 ground stops and delay programs started).
- Short track record (55 flights), so its score leans on the airline's record at this hour.
Limited track record · 55 flights
Find Delta 1719 fares Opens this date on Aviasales#2 · Delta 699
7:05 AM → 10:45 AM6h 13m nonstop
Local times, typical schedule. Last flown 2026-05-31.
73%
chance on time
- On time (history)
- 75%
- Cancelled
- 2.2%
- Avg arrival delay
- 11 min
- Arrived on time 75% of the time (354 flights, Jun 2025 to May 2026).
- Departs outside JFK's trouble window (1 PM to 7 PM, when 66% of its 167 ground stops and delay programs started).
Strong track record · 354 flights
Find Delta 699 fares Opens this date on Aviasales#3 · Alaska 23
11:30 AM → 2:50 PM6h 20m nonstop
Local times, typical schedule. Last flown 2026-05-31.
73%
chance on time
- On time (history)
- 74%
- Cancelled
- 2.2%
- Avg arrival delay
- 14 min
- Arrived on time 74% of the time (349 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (9 AM to noon: 81% on time; 6 to 9 PM: 57%).
- Departs outside JFK's trouble window (1 PM to 7 PM, when 66% of its 167 ground stops and delay programs started).
Strong track record · 349 flights
Find Alaska 23 fares Opens this date on Aviasales#4 · Delta 740
4:29 PM → 7:48 PM6h 19m nonstop
Local times, typical schedule. Last flown 2026-05-31.
68%
chance on time
- On time (history)
- 69%
- Cancelled
- 2.2%
- Avg arrival delay
- 21 min
- Arrived on time 69% of the time (353 flights, Jun 2025 to May 2026).
- Departs inside JFK's trouble window: 66% of its 167 ground stops and delay programs started between 1 PM and 7 PM.
- Lands inside SEA's trouble window: 54% of its 68 ground stops and delay programs started between 4 PM and 10 PM.
Strong track record · 353 flights
Find Delta 740 fares Opens this date on Aviasales#5 · JetBlue 263
5:29 PM → 8:56 PM6h 27m nonstop
Local times, typical schedule. Last flown 2026-05-31.
66%
chance on time
- On time (history)
- 70%
- Cancelled
- 1.2%
- Avg arrival delay
- 28 min
- Arrived on time 70% of the time (164 flights, Jun 2025 to May 2026).
- Departs inside JFK's trouble window: 66% of its 167 ground stops and delay programs started between 1 PM and 7 PM.
- Lands inside SEA's trouble window: 54% of its 68 ground stops and delay programs started between 4 PM and 10 PM.
Moderate track record · 164 flights
Find JetBlue 263 fares Opens this date on Aviasales#6 · Alaska 31
4:29 PM → 7:47 PM6h 25m nonstop
Local times, typical schedule. Last flown 2026-05-31.
65%
chance on time
- On time (history)
- 67%
- Cancelled
- 3.6%
- Avg arrival delay
- 24 min
- Arrived on time 67% of the time (348 flights, Jun 2025 to May 2026).
- Cancelled 3.6% of the time (13 of 363).
- Departs inside JFK's trouble window: 66% of its 167 ground stops and delay programs started between 1 PM and 7 PM.
- Lands inside SEA's trouble window: 54% of its 68 ground stops and delay programs started between 4 PM and 10 PM.
Strong track record · 348 flights
Find Alaska 31 fares Opens this date on Aviasales#7 · Alaska 21
7:00 AM → 10:18 AM6h 18m nonstop
Local times, typical schedule. Last flown 2026-05-31.
64%
chance on time
- On time (history)
- 66%
- Cancelled
- 3.9%
- Avg arrival delay
- 18 min
- Arrived on time 66% of the time (344 flights, Jun 2025 to May 2026).
- Cancelled 3.9% of the time (14 of 359).
- Departs outside JFK's trouble window (1 PM to 7 PM, when 66% of its 167 ground stops and delay programs started).
Strong track record · 344 flights
Find Alaska 21 fares Opens this date on Aviasales#8 · Delta 688
7:00 PM → 10:22 PM6h 26m nonstop
Local times, typical schedule. Last flown 2026-05-31.
63%
chance on time
- On time (history)
- 64%
- Cancelled
- 2.8%
- Avg arrival delay
- 21 min
- Arrived on time 64% of the time (347 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (6 to 9 PM: 57% on time; 9 AM to noon: 81%).
- Departs outside JFK's trouble window (1 PM to 7 PM, when 66% of its 167 ground stops and delay programs started).
Strong track record · 347 flights
Find Delta 688 fares Opens this date on Aviasales#9 · Alaska 32
6:36 PM → 10:12 PM6h 36m nonstop
Local times, typical schedule. Last flown 2026-03-17.
55%
chance on time
- On time (history)
- 65%
- Cancelled
- 8.8%
- Avg arrival delay
- 23 min
- Arrived on time 65% of the time (31 flights, Jun 2025 to May 2026).
- Cancelled 8.8% of the time (3 of 34).
- Leaves in this route's least on-time window (6 to 9 PM: 57% on time; 9 AM to noon: 81%).
- Departs inside JFK's trouble window: 66% of its 167 ground stops and delay programs started between 1 PM and 7 PM.
Limited track record · 31 flights
Find Alaska 32 fares Opens this date on Aviasales#10 · Alaska 17
6:43 PM → 10:08 PM6h 25m nonstop
Local times, typical schedule. Last flown 2026-05-31.
40%
chance on time
- On time (history)
- 41%
- Cancelled
- 2.4%
- Avg arrival delay
- 40 min
- Arrived on time 41% of the time (280 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (6 to 9 PM: 57% on time; 9 AM to noon: 81%).
- Departs inside JFK's trouble window: 66% of its 167 ground stops and delay programs started between 1 PM and 7 PM.
Strong track record · 280 flights
Find Alaska 17 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Delta Air Lines70%
1,338 flights · 72% on time as flown · 2.3% cancel
- JetBlue66%
166 flights · 70% on time as flown · 1.9% cancel
- Alaska Airlines62%
1,402 flights · 63% on time as flown · 3.2% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM71%
725 flights · avg delay 14 min
- 9 AM to noon81%
518 flights · avg delay 11 min
- 3 to 6 PM67%
842 flights · avg delay 25 min
- 6 to 9 PM57%
736 flights · avg delay 27 min
Best day: Tuesday (81%). Worst: Friday (75%).
Smarter routing
Nearby airports that run more on time
EWR → SEA 71% chance on time
Newark Liberty International Airport to Seattle–Tacoma International Airport · 2,179 flights a year · 21 mi from your airports · yours: 66%
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
- Air traffic control and airport volume46%
- Airline (crew, maintenance, boarding)25%
- Late-arriving aircraft22%
- Severe weather6%
- Security1%
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
JFK to SEA questions
- What time of day is best to fly JFK to SEA?
- 9 AM to noon: 81% of flights arrived on time, against 57% for departures 6 to 9 PM.
- Which airline is most on time from JFK to SEA?
- Delta, with a season-adjusted 70% chance of operating and arriving on time over 1,338 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 JFK to SEA?
- June (67% on time); the best was September (84%), 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 JFK
- SEA to JFK (return)
- JFK to LAX 78%
- JFK to SFO 75%
- JFK to BOS 73%
- JFK to MCO 73%
- JFK to MIA 76%
- JFK to ATL 76%
- JFK to FLL 72%
- JFK to LAS 80%
- JFK to PHX 78%
- JFK to DCA 67%
- JFK to SAN 79%
Live status: FAA delays and ground stops