Airport reliability
Seattle (SEA) on-time performance
How reliably flights leave Seattle, WA (SEA) and reach their destinations, by airline, departure hour and month, September 2025 to August 2026.
Seattle, WA164,759 departures in 12 months
- Departures on time
- 78.5% U.S. average 75.6%
- Cancelled
- 0.9% U.S. average 1.9%
- 60+ minutes late
- 5.2% U.S. average 8.1%
- Scheduled departures
- 164,759 12 months
What this means
SEA departures beat the U.S. average.
- 78.5% of the 164,759 scheduled departures from Seattle (SEA) arrived at their destination on time, 2.9 points higher than the U.S. average of 75.6%.
- 0.9% of departures were cancelled (U.S. average 1.9%), and 5.2% arrived an hour or more late.
- Flights arriving at SEA were on time 78.6% of the time.
- Among airlines with at least 300 departures, Envoy Air was the most punctual from SEA (84.7%) and JetBlue Airways the least (51.1%).
- Over the last 3 years, October was the most reliable month for departures from SEA (83.3% on time) and July the least reliable (70.4%).
- Cancellations peaked in January, when 3.7% of flights were cancelled.
- Flights scheduled to depart 6 am to 7 am were the most punctual (90.9% on time); flights scheduled to depart 8 pm to 9 pm were the least (73.3%).
Airlines at SEA
Ranked by on-time arrival
| Airline | On time | Cancelled | 60+ min late | Avg delay when late | Departures |
|---|---|---|---|---|---|
| Envoy AirSold as American Eagle | 84.7% | 0.0% | 4.9% | 74 min | 760 |
| SkyWest AirlinesSold as United Express, Delta Connection, American Eagle, Alaska | 84.1% | 0.7% | 4.3% | 60 min | 28,580 |
| Delta Air Lines | 79.5% | 1.1% | 5.7% | 64 min | 32,382 |
| United Airlines | 79.0% | 0.7% | 7.3% | 74 min | 8,683 |
| American Airlines | 77.6% | 1.7% | 7.1% | 97 min | 6,768 |
| Alaska Airlines | 77.5% | 0.9% | 4.6% | 47 min | 76,970 |
| Frontier Airlines | 74.1% | 2.2% | 8.3% | 89 min | 1,397 |
| Southwest Airlines | 67.7% | 0.4% | 7.5% | 50 min | 8,194 |
| Hawaiian Airlines | 64.9% | 1.5% | 10.3% | 93 min | 612 |
| JetBlue Airways | 51.1% | 4.6% | 19.4% | 101 min | 413 |
Tap a heading to sort.
On-time rate by departure hour
Share of scheduled flights on time SEA average 78.5%
Show as table
| Period | On time | Flights |
|---|---|---|
| Departing before 6 am | 90.2% | 3,374 |
| Departing 6 am to 7 am | 90.9% | 4,480 |
| Departing 7 am to 8 am | 85.3% | 13,638 |
| Departing 8 am to 9 am | 83.3% | 12,678 |
| Departing 9 am to 10 am | 81.0% | 12,224 |
| Departing 10 am to 11 am | 76.8% | 10,260 |
| Departing 11 am to noon | 74.2% | 15,404 |
| Departing noon to 1 pm | 80.1% | 7,299 |
| Departing 1 pm to 2 pm | 74.3% | 9,614 |
| Departing 2 pm to 3 pm | 75.6% | 6,274 |
| Departing 3 pm to 4 pm | 75.7% | 10,754 |
| Departing 4 pm to 5 pm | 76.2% | 5,689 |
| Departing 5 pm to 6 pm | 75.0% | 11,202 |
| Departing 6 pm to 7 pm | 75.5% | 6,777 |
| Departing 7 pm to 8 pm | 75.5% | 9,271 |
| Departing 8 pm to 9 pm | 73.3% | 5,898 |
| Departing 9 pm to 10 pm | 78.9% | 8,171 |
| Departing 10 pm to 11 pm | 77.0% | 5,208 |
| Departing 11 pm to midnight | 81.8% | 6,544 |
Best and worst months at SEA
Share of scheduled flights on time 12-month average 78.5%
Show as table
| Period | On time | Flights |
|---|---|---|
| January | 77.0% | 35,560 |
| February | 81.2% | 32,840 |
| March | 79.9% | 38,034 |
| April | 82.2% | 38,504 |
| May | 78.0% | 43,532 |
| June | 74.0% | 46,280 |
| July | 70.4% | 48,989 |
| August | 72.2% | 47,862 |
| September | 80.4% | 44,398 |
| October | 83.3% | 41,935 |
| November | 82.7% | 38,186 |
| December | 78.4% | 38,355 |
Month by month, last 12 months
Share of scheduled flights on time U.S. average 75.6%
Show as table
| Period | On time | Flights |
|---|---|---|
| Sep 2025 | 82.5% | 14,552 |
| Oct 2025 | 81.8% | 13,859 |
| Nov 2025 | 79.9% | 12,616 |
| Dec 2025 | 73.1% | 13,023 |
| Jan 2026 | 79.7% | 11,927 |
| Feb 2026 | 83.5% | 11,000 |
| Mar 2026 | 78.1% | 12,830 |
| Apr 2026 | 85.3% | 12,864 |
| May 2026 | 81.6% | 14,564 |
| Jun 2026 | 77.6% | 15,402 |
| Jul 2026 | 70.9% | 16,214 |
| Aug 2026 | 71.7% | 15,908 |
Busiest routes from SEA
| To | On time | Cancelled | Airlines | Flights |
|---|---|---|---|---|
| Los Angeles (LAX) | 81.3% | 0.8% | 6 | 7,536 |
| Phoenix (PHX) | 77.3% | 0.7% | 7 | 7,205 |
| San Francisco (SFO) | 59.1% | 1.1% | 5 | 6,817 |
| Anchorage (ANC) | 75.9% | 0.7% | 3 | 6,619 |
| Denver (DEN) | 77.3% | 0.7% | 6 | 6,333 |
| Las Vegas (LAS) | 76.8% | 0.9% | 5 | 5,620 |
| Chicago (ORD) | 75.0% | 1.2% | 4 | 5,538 |
| Dallas/Fort Worth (DFW) | 75.9% | 1.7% | 4 | 5,228 |
| Spokane (GEG) | 82.3% | 0.9% | 3 | 4,956 |
| Portland (PDX) | 81.6% | 0.7% | 3 | 4,826 |
| San Diego (SAN) | 74.0% | 0.9% | 4 | 4,647 |
| San Jose (SJC) | 79.6% | 0.6% | 6 | 4,425 |
| Sacramento (SMF) | 81.6% | 0.4% | 3 | 4,387 |
| Salt Lake City (SLC) | 82.7% | 0.8% | 4 | 4,098 |
| Santa Ana (SNA) | 83.7% | 0.9% | 3 | 3,945 |
| Boise (BOI) | 86.0% | 0.3% | 2 | 3,829 |
| Atlanta (ATL) | 83.0% | 0.7% | 2 | 3,294 |
| Honolulu (HNL) | 65.1% | 1.1% | 3 | 2,927 |
| New York (JFK) | 74.7% | 3.2% | 3 | 2,906 |
| Minneapolis (MSP) | 86.3% | 0.8% | 2 | 2,676 |
Sources & data dates
- Source
- U.S. DOT Bureau of Transportation Statistics, Reporting Carrier On-Time Performance (1987-present)
- Period
- September 2025 to August 2026 (12 months); month-of-year patterns September 2023 to August 2026
- Data through
- August 2026
- Processed
- 2026-11-03
- Scope
- Scheduled nonstop domestic departures from Seattle, WA (SEA) by airlines that report to the DOT.
- Method
- Rates use all scheduled flights as the denominator; cancelled and diverted flights count as not on time. Figures based on fewer than 50 scheduled flights are suppressed. Full methodology.