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Route on-time record

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

Seattle (Seattle–Tacoma International Airport) to San Diego (San Diego International Airport). 4,575 nonstop flights in Jun 2025 to May 2026, 78% arrived within 15 minutes and 1.2% were cancelled. The most reliable flight number was Delta 2508 at 7:20 AM.

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

SEA → SAN

Seattle to San Diego: 4,575 nonstop flights a year

On time (12 months)

78%

Cancelled

1.2%

avg delay 12 min

Best time to leave

Before 9 AM

91% on time vs 71% 3 to 6 PM

Most reliable airline

Delta

82% chance on time

Check SEA to SAN 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 · Delta 2508

    7:20 AM → 10:17 AM2h 57m nonstop

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

    91%

    chance on time

    On time (history)
    91%
    Cancelled
    0.6%
    Avg arrival delay
    6 min
    • Arrived on time 91% of the time (345 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 91% on time; 3 to 6 PM: 71%).
    • Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).
    • Lands inside SAN's trouble window: 66% of its 164 ground stops and delay programs started between 6 AM and noon.

    Strong track record · 345 flights

    Find Delta 2508 fares Opens this date on Aviasales

  2. #2 · Alaska 1367

    7:26 AM → 10:22 AM2h 54m nonstop

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

    89%

    chance on time

    On time (history)
    90%
    Cancelled
    1.1%
    Avg arrival delay
    6 min
    • Arrived on time 90% of the time (173 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 91% on time; 3 to 6 PM: 71%).
    • Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).
    • Lands inside SAN's trouble window: 66% of its 164 ground stops and delay programs started between 6 AM and noon.

    Moderate track record · 173 flights

    Find Alaska 1367 fares Opens this date on Aviasales

  3. #3 · Alaska 664

    6:26 AM → 9:15 AM2h 49m nonstop

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

    84%

    chance on time

    On time (history)
    100%
    Cancelled
    0.0%
    Avg arrival delay
    2 min
    • Arrived on time 100% of the time (11 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 91% on time; 3 to 6 PM: 71%).
    • Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).
    • Lands inside SAN's trouble window: 66% of its 164 ground stops and delay programs started between 6 AM and noon.

    Limited track record · 11 flights

    Find Alaska 664 fares Opens this date on Aviasales

  4. #4 · Delta 2533

    9:45 AM → 12:42 PM2h 54m nonstop

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

    82%

    chance on time

    On time (history)
    83%
    Cancelled
    0.9%
    Avg arrival delay
    9 min
    • Arrived on time 83% of the time (336 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 · 336 flights

    Find Delta 2533 fares Opens this date on Aviasales

  5. #5 · Delta 2572

    11:45 AM → 2:44 PM2h 53m nonstop

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

    81%

    chance on time

    On time (history)
    82%
    Cancelled
    1.4%
    Avg arrival delay
    12 min
    • Arrived on time 82% of the time (354 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 · 354 flights

    Find Delta 2572 fares Opens this date on Aviasales

  6. #6 · Delta 2613

    3:30 PM → 6:20 PM2h 47m nonstop

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

    80%

    chance on time

    On time (history)
    80%
    Cancelled
    0.8%
    Avg arrival delay
    12 min
    • Arrived on time 80% of the time (259 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (3 to 6 PM: 71% on time; Before 9 AM: 91%).
    • 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 · 259 flights

    Find Delta 2613 fares Opens this date on Aviasales

  7. #7 · Alaska 338

    9:07 AM → 12:04 PM2h 57m nonstop

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

    80%

    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).
    • 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 (21 flights), so its score leans on the airline's record at this hour.

    Limited track record · 21 flights

    Find Alaska 338 fares Opens this date on Aviasales

  8. #8 · Alaska 1369

    9:09 PM → 11:59 PM2h 50m nonstop

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

    80%

    chance on time

    On time (history)
    84%
    Cancelled
    0.0%
    Avg arrival delay
    8 min
    • Arrived on time 84% of the time (104 flights, Jun 2025 to May 2026).
    • Never cancelled in 105 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 · 104 flights

    Find Alaska 1369 fares Opens this date on Aviasales

  9. #9 · Alaska 650

    10:52 AM → 1:41 PM2h 50m nonstop

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

    78%

    chance on time

    On time (history)
    78%
    Cancelled
    0.5%
    Avg arrival delay
    10 min
    • Arrived on time 78% of the time (217 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 · 217 flights

    Find Alaska 650 fares Opens this date on Aviasales

  10. #10 · Alaska 765

    1:00 PM → 3:46 PM2h 50m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Alaska 621; its record covers all of them.

    77%

    chance on time

    On time (history)
    78%
    Cancelled
    0.5%
    Avg arrival delay
    11 min
    • Arrived on time 78% of the time (361 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 · 361 flights

    Find Alaska 765 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Delta Air Lines82%

    1,698 flights · 83% on time as flown · 0.9% cancel

  • Alaska Airlines74%

    2,788 flights · 75% on time as flown · 1.5% cancel

  • Southwest Airlines62%

    88 flights · 59% on time as flown · 0.8% cancel

On time by departure time

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

  • Before 9 AM91%

    751 flights · avg delay 6 min

  • 9 AM to noon77%

    1,322 flights · avg delay 11 min

  • Noon to 3 PM78%

    574 flights · avg delay 13 min

  • 3 to 6 PM71%

    844 flights · avg delay 15 min

  • 6 to 9 PM73%

    958 flights · avg delay 14 min

Best day: Tuesday (85%). Worst: Friday (76%).

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
80
F
79
M
79
A
83
M
80
J
79
J
78
A
74
S
82
O
80
N
79
D
78

What delays this route

  • Airline (crew, maintenance, boarding)38%
  • Late-arriving aircraft30%
  • Air traffic control and airport volume29%
  • Severe weather2%

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 SAN questions

What time of day is best to fly SEA to SAN?
Before 9 AM: 91% of flights arrived on time, against 71% for departures 3 to 6 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 SAN?
Delta, with a season-adjusted 82% chance of operating and arriving on time over 1,698 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 SAN?
August (74% on time); the best was April (83%), 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

Live status: FAA delays and ground stops