EWR to SEA flight delays & on-time performance
Nonstop flights from Newark Liberty International Airport to Seattle–Tacoma International Airport · 2,402 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at EWR or SEA right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Newark (EWR) to Seattle (SEA) arrived on time 74% of the time in Aug 2025 – Jul 2026, worse than the 78% national average.
- 2.2% were cancelled, and 9% arrived an hour or more late.
- United Airlines was the most punctual airline here (76% on time); Alaska Airlines was the least (72%).
- Departures scheduled around 9am did best (84% on time); around 7pm did worst (57%).
- Thursday was the most reliable day to fly (78% on time) and Sunday the least (70%).
- The largest source of delay minutes was air traffic control & airport congestion (37%).
Which airline is most on time from EWR to SEA?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| United Airlines | 76% | 1.5% | 17 min | 8.5% | 996 |
| Alaska Airlines | 72% | 2.8% | 20 min | 8.7% | 1,267 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 7am78%538 flights
- 8am76%95 flights
- 9am84%149 flights
- 10am91%58 flights
- 11am80%55 flights
- 3pm84%152 flights
- 4pm75%283 flights
- 5pm69%268 flights
- 6pm71%178 flights
- 7pm57%308 flights
- 8pm66%144 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday74%2.4% cancelled
- Tuesday75%2.5% cancelled
- Wednesday74%1.3% cancelled
- Thursday78%2.4% cancelled
- Friday70%0.9% cancelled
- Saturday73%2.4% cancelled
- Sunday70%3.6% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Air traffic control & airport congestion37%
- Late-arriving aircraft33%
- Airline (crew, maintenance, cleaning, fueling)21%
- Extreme weather8%
- Security1%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather62%
- Airline (crew, maintenance, cleaning, fueling)20%
- Air traffic control & airport congestion18%
- Security0%
EWR to SEA: common questions
- How often are EWR to SEA flights on time?
- 74% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Newark to Seattle cancelled?
- 2.2% of scheduled flights were cancelled (50 of 2,263).
- How long are typical delays?
- Across all flights the average arrival delay was 19 min (early arrivals count as zero). Flights that were late arrived 68 min behind schedule on average, and 8.6% of flights were an hour or more late.
- How long is taxi time at EWR?
- Flights on this route spent 26 min taxiing from the gate to takeoff on average.
Related routes
Return trip: SEA to EWR — 82% on time
More flights from Newark
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: EWR → SEA, nonstop flights by US airlines that report to the DOT. How we calculate this.