Route on-time record
SEA to SJC: most on-time flights and the best time to fly
Seattle (Seattle–Tacoma International Airport) to San Jose (Norman Y. Mineta San Jose International Airport). 4,381 nonstop flights in Jun 2025 to May 2026, 82% arrived within 15 minutes and 0.9% were cancelled. The most reliable flight number was SkyWest 3736 at 8:36 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
SEA → SJC
Seattle to San Jose: 4,381 nonstop flights a year
On time (12 months)
82%
Cancelled
0.9%
avg delay 10 min
Best time to leave
Before 9 AM
92% on time vs 75% 6 to 9 PM
Most reliable airline
SkyWest
88% 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 · SkyWest 3736 · sold as United Express, Delta Connection, American Eagle or Alaska
8:36 AM → 10:55 AM2h 22m nonstop
Local times, typical schedule. Last flown 2026-05-31.
90%
chance on time
- On time (history)
- 91%
- Cancelled
- 0.0%
- Avg arrival delay
- 10 min
- Arrived on time 91% of the time (170 flights, Jun 2025 to May 2026).
- Never cancelled in 170 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 92% on time; 6 to 9 PM: 75%).
- 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 · 170 flights
Find 8:36 AM flight fares Opens this date on Aviasales#2 · Alaska 1341
7:13 AM → 9:28 AM2h 15m nonstop
Local times, typical schedule. Last flown 2026-05-12.
88%
chance on time
- On time (history)
- 91%
- Cancelled
- 2.7%
- Avg arrival delay
- 4 min
- Arrived on time 91% of the time (179 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 92% on time; 6 to 9 PM: 75%).
- 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 · 179 flights
Find Alaska 1341 fares Opens this date on Aviasales#3 · Southwest 2841
7:50 AM → 10:05 AM2h 15m nonstop
Local times, typical schedule. Last flown 2026-05-27.
86%
chance on time
- On time (history)
- 94%
- Cancelled
- 0.0%
- Avg arrival delay
- 1 min
- Arrived on time 94% of the time (16 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 92% on time; 6 to 9 PM: 75%).
- 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 (16 flights), so its score leans on the airline's record at this hour.
Limited track record · 16 flights
Find Southwest 2841 fares Opens this date on Aviasales#4 · SkyWest 3897 · sold as United Express, Delta Connection, American Eagle or Alaska
2:50 PM → 5:05 PM2h 15m nonstop
Local times, typical schedule. Last flown 2026-05-31.
85%
chance on time
- On time (history)
- 84%
- Cancelled
- 0.0%
- Avg arrival delay
- 10 min
- Arrived on time 84% of the time (25 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 (25 flights), so its score leans on the airline's record at this hour.
Limited track record · 25 flights
Find 2:50 PM flight fares Opens this date on Aviasales#5 · SkyWest 3956 · sold as United Express, Delta Connection, American Eagle or Alaska
7:59 PM → 10:18 PM2h 21m nonstop
Local times, typical schedule. Last flown 2026-05-31.
85%
chance on time
- On time (history)
- 87%
- Cancelled
- 0.7%
- Avg arrival delay
- 7 min
- Arrived on time 87% of the time (138 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (6 to 9 PM: 75% on time; Before 9 AM: 92%).
- 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 · 138 flights
Find 7:59 PM flight fares Opens this date on Aviasales#6 · Southwest 4201
9:40 AM → 11:55 AM2h 15m nonstop
Local times, typical schedule. Last flown 2026-05-29.
84%
chance on time
- On time (history)
- 96%
- Cancelled
- 0.0%
- Avg arrival delay
- 2 min
- Arrived on time 96% of the time (23 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 (23 flights), so its score leans on the airline's record at this hour.
Limited track record · 23 flights
Find Southwest 4201 fares Opens this date on Aviasales#7 · SkyWest 3789 · sold as United Express, Delta Connection, American Eagle or Alaska
12:34 PM → 2:57 PM2h 23m nonstop
Local times, typical schedule. Last flown 2026-05-31.
84%
chance on time
- On time (history)
- 84%
- Cancelled
- 0.0%
- Avg arrival delay
- 11 min
- Arrived on time 84% of the time (349 flights, Jun 2025 to May 2026).
- Never cancelled in 349 scheduled flights.
- 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 · 349 flights
Find 12:34 PM flight fares Opens this date on Aviasales#8 · SkyWest 4100 · sold as United Express, Delta Connection, American Eagle or Alaska
3:15 PM → 5:31 PM2h 16m nonstop
Local times, typical schedule. Last flown 2026-05-06.
83%
chance on time
- On time (history)
- 85%
- Cancelled
- 1.3%
- Avg arrival delay
- 9 min
- Arrived on time 85% of the time (78 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).
Moderate track record · 78 flights
Find 3:15 PM flight fares Opens this date on Aviasales#9 · SkyWest 4132 · sold as United Express, Delta Connection, American Eagle or Alaska
5:45 PM → 8:05 PM2h 20m nonstop
Local times, typical schedule. Last flown 2026-05-31.
83%
chance on time
- On time (history)
- 85%
- Cancelled
- 0.0%
- Avg arrival delay
- 12 min
- Arrived on time 85% of the time (67 flights, Jun 2025 to May 2026).
- Never cancelled in 67 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 · 67 flights
Find 5:45 PM flight fares Opens this date on Aviasales#10 · Southwest 4423
6:30 AM → 8:40 AM2h 10m nonstop
Local times, typical schedule. Last flown 2026-04-06.
83%
chance on time
- On time (history)
- 85%
- Cancelled
- 0.0%
- Avg arrival delay
- 8 min
- Arrived on time 85% of the time (20 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 92% on time; 6 to 9 PM: 75%).
- 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 (20 flights), so its score leans on the airline's record at this hour.
Limited track record · 20 flights
Find Southwest 4423 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- SkyWest Airlines (sold as United Express, Delta Connection, American Eagle or Alaska)88%
1,538 flights · 88% on time as flown · 0.3% cancel
- Alaska Airlines79%
1,891 flights · 80% on time as flown · 1.7% cancel
- Southwest Airlines75%
947 flights · 74% on time as flown · 0.4% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM92%
882 flights · avg delay 5 min
- 9 AM to noon81%
901 flights · avg delay 10 min
- Noon to 3 PM81%
704 flights · avg delay 9 min
- 3 to 6 PM79%
997 flights · avg delay 11 min
- 6 to 9 PM75%
842 flights · avg delay 14 min
Best day: Tuesday (86%). Worst: Friday (78%).
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)41%
- Late-arriving aircraft39%
- Air traffic control and airport volume11%
- Severe weather8%
- 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
SEA to SJC questions
- What time of day is best to fly SEA to SJC?
- Before 9 AM: 92% of flights arrived on time, against 75% for departures 6 to 9 PM. 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 SJC?
- SkyWest, with a season-adjusted 88% chance of operating and arriving on time over 1,538 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 SJC?
- June (77% on time); the best was April (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
- SJC 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