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Route on-time record

SJC to SEA: most on-time flights and the best time to fly

San Jose (Norman Y. Mineta San Jose International Airport) to Seattle (Seattle–Tacoma International Airport). 4,379 nonstop flights in Jun 2025 to May 2026, 83% arrived within 15 minutes and 0.9% were cancelled. The most reliable flight number was Alaska 754 at 6:15 AM.

Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.

SJC → SEA

San Jose to Seattle: 4,379 nonstop flights a year

On time (12 months)

83%

Cancelled

0.9%

avg delay 10 min

Best time to leave

Before 9 AM

90% on time vs 66% after 9 PM

Most reliable airline

SkyWest

88% chance on time

Check SJC to SEA fares

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. #1 · Alaska 754

    6:15 AM → 8:39 AM2h 24m nonstop

    Local times, typical schedule. Last flown 2026-05-12. Same departure also flew as Alaska 1399; its record covers all of them.

    95%

    chance on time

    On time (history)
    100%
    Cancelled
    0.0%
    Avg arrival delay
    0 min
    • Arrived on time 100% of the time (47 flights, Jun 2025 to May 2026).
    • Never cancelled in 47 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 90% on time; After 9 PM: 66%).
    • Short track record (47 flights), so its score leans on the airline's record at this hour.

    Limited track record · 47 flights

    Find Alaska 754 fares Opens this date on Aviasales

  2. #2 · SkyWest 4041 · sold as United Express, Delta Connection, American Eagle or Alaska

    7:15 AM → 9:38 AM2h 29m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    93%

    chance on time

    On time (history)
    93%
    Cancelled
    0.0%
    Avg arrival delay
    6 min
    • Arrived on time 93% of the time (342 flights, Jun 2025 to May 2026).
    • Never cancelled in 342 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 90% on time; After 9 PM: 66%).

    Strong track record · 342 flights

    Find 7:15 AM flight fares Opens this date on Aviasales

  3. #3 · Southwest 4195

    6:20 AM → 8:40 AM2h 20m nonstop

    Local times, typical schedule. Last flown 2026-05-27.

    93%

    chance on time

    On time (history)
    100%
    Cancelled
    0.0%
    Avg arrival delay
    1 min
    • Arrived on time 100% of the time (16 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 90% on time; After 9 PM: 66%).
    • Short track record (16 flights), so its score leans on the airline's record at this hour.

    Limited track record · 16 flights

    Find Southwest 4195 fares Opens this date on Aviasales

  4. #4 · Southwest 4660

    6:00 AM → 8:25 AM2h 25m nonstop

    Local times, typical schedule. Last flown 2026-04-06.

    92%

    chance on time

    On time (history)
    100%
    Cancelled
    0.0%
    Avg arrival delay
    1 min
    • Arrived on time 100% of the time (15 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 90% on time; After 9 PM: 66%).
    • Short track record (15 flights), so its score leans on the airline's record at this hour.

    Limited track record · 15 flights

    Find Southwest 4660 fares Opens this date on Aviasales

  5. #5 · Southwest 3628

    6:35 AM → 8:50 AM2h 15m nonstop

    Local times, typical schedule. Last flown 2026-04-01.

    91%

    chance on time

    On time (history)
    100%
    Cancelled
    0.0%
    Avg arrival delay
    1 min
    • Arrived on time 100% of the time (8 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 90% on time; After 9 PM: 66%).
    • Short track record (8 flights), so its score leans on the airline's record at this hour.

    Limited track record · 8 flights

    Find Southwest 3628 fares Opens this date on Aviasales

  6. #6 · SkyWest 3736 · sold as United Express, Delta Connection, American Eagle or Alaska

    11:40 AM → 2:00 PM2h 20m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    91%

    chance on time

    On time (history)
    92%
    Cancelled
    0.0%
    Avg arrival delay
    8 min
    • Arrived on time 92% of the time (167 flights, Jun 2025 to May 2026).
    • Never cancelled in 167 scheduled flights.

    Moderate track record · 167 flights

    Find 11:40 AM flight fares Opens this date on Aviasales

  7. #7 · Alaska 1311

    10:22 AM → 12:40 PM2h 18m nonstop

    Local times, typical schedule. Last flown 2026-05-12.

    89%

    chance on time

    On time (history)
    92%
    Cancelled
    3.1%
    Avg arrival delay
    4 min
    • Arrived on time 92% of the time (282 flights, Jun 2025 to May 2026).
    • Cancelled 3.1% of the time (9 of 291).

    Strong track record · 282 flights

    Find Alaska 1311 fares Opens this date on Aviasales

  8. #8 · Southwest 1097

    6:45 AM → 9:05 AM2h 20m nonstop

    Local times, typical schedule. Last flown 2026-05-30.

    88%

    chance on time

    On time (history)
    87%
    Cancelled
    0.0%
    Avg arrival delay
    3 min
    • Arrived on time 87% of the time (31 flights, Jun 2025 to May 2026).
    • Never cancelled in 31 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 90% on time; After 9 PM: 66%).
    • Short track record (31 flights), so its score leans on the airline's record at this hour.

    Limited track record · 31 flights

    Find Southwest 1097 fares Opens this date on Aviasales

  9. #9 · SkyWest 4132 · sold as United Express, Delta Connection, American Eagle or Alaska

    8:50 PM → 11:22 PM2h 32m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    88%

    chance on time

    On time (history)
    96%
    Cancelled
    0.0%
    Avg arrival delay
    1 min
    • Arrived on time 96% of the time (25 flights, Jun 2025 to May 2026).
    • Short track record (25 flights), so its score leans on the airline's record at this hour.

    Limited track record · 25 flights

    Find 8:50 PM flight fares Opens this date on Aviasales

  10. #10 · SkyWest 3785 · sold as United Express, Delta Connection, American Eagle or Alaska

    3:25 PM → 5:40 PM2h 16m nonstop

    Local times, typical schedule. Last flown 2026-04-12.

    88%

    chance on time

    On time (history)
    91%
    Cancelled
    2.8%
    Avg arrival delay
    3 min
    • Arrived on time 91% of the time (35 flights, Jun 2025 to May 2026).
    • Lands inside SEA's trouble window: 54% of its 68 ground stops and delay programs started between 4 PM and 10 PM.
    • Short track record (35 flights), so its score leans on the airline's record at this hour.

    Limited track record · 35 flights

    Find 3:25 PM flight 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%

    1,539 flights · 89% on time as flown · 0.3% cancel

  • Alaska Airlines81%

    1,889 flights · 82% on time as flown · 1.8% cancel

  • Southwest Airlines77%

    948 flights · 76% on time as flown · 0.1% cancel

On time by departure time

All airlines, scheduled local departure, Jun 2025 to May 2026.

  • Before 9 AM90%

    991 flights · avg delay 7 min

  • 9 AM to noon88%

    912 flights · avg delay 7 min

  • Noon to 3 PM83%

    768 flights · avg delay 11 min

  • 3 to 6 PM84%

    751 flights · avg delay 11 min

  • 6 to 9 PM74%

    817 flights · avg delay 14 min

  • After 9 PM66%

    140 flights · avg delay 14 min

Best day: Tuesday (88%). Worst: Thursday (81%).

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.

J
88
F
89
M
87
A
86
M
82
J
77
J
81
A
82
S
82
O
87
N
87
D
83

What delays this route

  • Airline (crew, maintenance, boarding)37%
  • Late-arriving aircraft33%
  • Air traffic control and airport volume22%
  • 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

SJC to SEA questions

What time of day is best to fly SJC to SEA?
Before 9 AM: 90% of flights arrived on time, against 66% for departures after 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 SJC to SEA?
SkyWest, with a season-adjusted 88% chance of operating and arriving on time over 1,539 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 SJC to SEA?
June (77% on time); the best was February (89%), 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 SJC

Live status: FAA delays and ground stops