Route on-time record
SEA to EWR: most on-time flights and the best time to fly
Seattle (Seattle–Tacoma International Airport) to Newark (Newark Liberty International Airport). 2,180 nonstop flights in Jun 2025 to May 2026, 80% arrived within 15 minutes and 1.7% were cancelled. The most reliable flight number was United 1900 at 7:25 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
SEA → EWR
Seattle to Newark: 2,180 nonstop flights a year
On time (12 months)
80%
Cancelled
1.7%
avg delay 15 min
Best time to leave
Before 9 AM
90% on time vs 67% 9 AM to noon
Most reliable airline
United
79% chance on time
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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 1900
7:25 AM → 3:49 PM5h 24m nonstop
Local times, typical schedule. Last flown 2026-05-31.
91%
chance on time
- On time (history)
- 97%
- Cancelled
- 0.0%
- Avg arrival delay
- 5 min
- Arrived on time 97% of the time (32 flights, Jun 2025 to May 2026).
- Never cancelled in 32 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 90% on time; 9 AM to noon: 67%).
- 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 · 32 flights
Find United 1900 fares Opens this date on Aviasales#2 · Alaska 286
7:55 AM → 4:33 PM5h 38m nonstop
Local times, typical schedule. Last flown 2026-05-12.
89%
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).
- Leaves in this route's most on-time window (Before 9 AM: 90% on time; 9 AM to noon: 67%).
- Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).
- Lands inside EWR's trouble window: 65% of its 259 ground stops and delay programs started between 1 PM and 7 PM.
Limited track record · 21 flights
Find Alaska 286 fares Opens this date on Aviasales#3 · Alaska 298
6:13 AM → 2:30 PM5h 17m nonstop
Local times, typical schedule. Last flown 2026-05-31.
86%
chance on time
- On time (history)
- 89%
- Cancelled
- 3.8%
- Avg arrival delay
- 7 min
- Arrived on time 89% of the time (299 flights, Jun 2025 to May 2026).
- Cancelled 3.8% of the time (12 of 313).
- Leaves in this route's most on-time window (Before 9 AM: 90% on time; 9 AM to noon: 67%).
- 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 · 299 flights
Find Alaska 298 fares Opens this date on Aviasales#4 · United 1274
11:00 PM → 7:21 AM5h 21m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 2680; its record covers all of them.
84%
chance on time
- On time (history)
- 91%
- Cancelled
- 0.0%
- Avg arrival delay
- 3 min
- Arrived on time 91% of the time (64 flights, Jun 2025 to May 2026).
- Never cancelled in 64 scheduled flights.
- Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).
Moderate track record · 64 flights
Find United 1274 fares Opens this date on Aviasales#5 · Alaska 356
8:13 AM → 4:38 PM5h 25m nonstop
Local times, typical schedule. Last flown 2026-04-21.
83%
chance on time
- On time (history)
- 91%
- Cancelled
- 0.0%
- Avg arrival delay
- 5 min
- Arrived on time 91% of the time (35 flights, Jun 2025 to May 2026).
- Never cancelled in 35 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 90% on time; 9 AM to noon: 67%).
- 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 · 35 flights
Find Alaska 356 fares Opens this date on Aviasales#6 · United 2211
11:59 PM → 8:08 AM5h 09m nonstop
Local times, typical schedule. Last flown 2026-03-28.
82%
chance on time
- On time (history)
- 86%
- Cancelled
- 4.3%
- Avg arrival delay
- 11 min
- Arrived on time 86% of the time (22 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).
- 78% of its delay minutes came from the plane arriving late from an earlier flight.
- Short track record (22 flights), so its score leans on the airline's record at this hour.
Limited track record · 22 flights
Find United 2211 fares Opens this date on Aviasales#7 · Alaska 1473
10:45 PM → 6:59 AM5h 14m nonstop
Local times, typical schedule. Last flown 2026-03-17.
78%
chance on time
- On time (history)
- 88%
- Cancelled
- 0.0%
- Avg arrival delay
- 11 min
- Arrived on time 88% of the time (8 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).
- Short track record (8 flights), so its score leans on the airline's record at this hour.
Limited track record · 8 flights
Find Alaska 1473 fares Opens this date on Aviasales#8 · United 341
1:06 PM → 9:30 PM5h 24m nonstop
Local times, typical schedule. Last flown 2026-05-31.
78%
chance on time
- On time (history)
- 78%
- Cancelled
- 1.3%
- Avg arrival delay
- 16 min
- Arrived on time 78% of the time (231 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 · 231 flights
Find United 341 fares Opens this date on Aviasales#9 · Alaska 274
9:38 PM → 6:00 AM5h 22m nonstop
Local times, typical schedule. Last flown 2026-05-31.
78%
chance on time
- On time (history)
- 81%
- Cancelled
- 0.0%
- Avg arrival delay
- 9 min
- Arrived on time 81% of the time (86 flights, Jun 2025 to May 2026).
- Never cancelled in 86 scheduled flights.
- 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 · 86 flights
Find Alaska 274 fares Opens this date on Aviasales#10 · Alaska 293
3:30 PM → 11:59 PM5h 29m nonstop
Local times, typical schedule. Last flown 2026-05-31.
74%
chance on time
- On time (history)
- 79%
- Cancelled
- 0.0%
- Avg arrival delay
- 11 min
- Arrived on time 79% of the time (19 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).
- Short track record (19 flights), so its score leans on the airline's record at this hour.
Limited track record · 19 flights
Find Alaska 293 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- United Airlines79%
972 flights · 79% on time as flown · 1.2% cancel
- Alaska Airlines79%
1,208 flights · 81% on time as flown · 2.2% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM90%
777 flights · avg delay 8 min
- 9 AM to noon67%
378 flights · avg delay 22 min
- Noon to 3 PM71%
327 flights · avg delay 25 min
- After 9 PM81%
659 flights · avg delay 12 min
Best day: Tuesday (84%). Worst: Thursday (73%).
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 volume47%
- Airline (crew, maintenance, boarding)27%
- Late-arriving aircraft19%
- Severe weather7%
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 EWR questions
- What time of day is best to fly SEA to EWR?
- Before 9 AM: 90% of flights arrived on time, against 67% for departures 9 AM to noon. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
- Which airline is most on time from SEA to EWR?
- United, with a season-adjusted 79% chance of operating and arriving on time over 972 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 EWR?
- July (68% on time); the best was March (86%), 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
- EWR 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%
Live status: FAA delays and ground stops