Route on-time record

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

San Diego (San Diego International Airport) to Seattle (Seattle–Tacoma International Airport). 4,573 nonstop flights in Jun 2025 to May 2026, 81% arrived within 15 minutes and 1.7% were cancelled. The most reliable flight number was Alaska 1309 at 6:15 AM.

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

SAN → SEA

San Diego to Seattle: 4,573 nonstop flights a year

On time (12 months)

81%

Cancelled

1.7%

avg delay 14 min

Best time to leave

Before 9 AM

86% on time vs 75% 6 to 9 PM

Most reliable airline

Delta

86% chance on time

Check SAN 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 · Alaska 1309
6:15 AM → 9:27 AM3h 12m nonstop
Local times, typical schedule. Last flown 2026-05-31.
92%
chance on time
On time (history)
98%
Cancelled
1.8%
Avg arrival delay
0 min
- Arrived on time 98% of the time (55 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 86% on time; 6 to 9 PM: 75%).
- Departs inside SAN's trouble window: 66% of its 164 ground stops and delay programs started between 6 AM and noon.
- Short track record (55 flights), so its score leans on the airline's record at this hour.
Limited track record · 55 flights
Find Alaska 1309 fares Opens this date on Aviasales
#2 · Delta 2530
7:30 AM → 10:40 AM3h 14m nonstop
Local times, typical schedule. Last flown 2026-05-31.
91%
chance on time
On time (history)
92%
Cancelled
0.3%
Avg arrival delay
8 min
- Arrived on time 92% of the time (363 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 86% on time; 6 to 9 PM: 75%).
- Departs inside SAN's trouble window: 66% of its 164 ground stops and delay programs started between 6 AM and noon.
Strong track record · 363 flights
Find Delta 2530 fares Opens this date on Aviasales
#3 · Delta 2508
11:15 AM → 2:32 PM3h 17m nonstop
Local times, typical schedule. Last flown 2026-05-31.
87%
chance on time
On time (history)
88%
Cancelled
0.6%
Avg arrival delay
10 min
- Arrived on time 88% of the time (347 flights, Jun 2025 to May 2026).
- Departs inside SAN's trouble window: 66% of its 164 ground stops and delay programs started between 6 AM and noon.
Strong track record · 347 flights
Find Delta 2508 fares Opens this date on Aviasales
#4 · Delta 2572
3:40 PM → 6:50 PM3h 14m nonstop
Local times, typical schedule. Last flown 2026-05-31.
86%
chance on time
On time (history)
88%
Cancelled
2.1%
Avg arrival delay
10 min
- Arrived on time 88% of the time (325 flights, Jun 2025 to May 2026).
- Departs outside SAN's trouble window (6 AM to noon, when 66% of its 164 ground stops and delay programs started).
- Lands inside SEA's trouble window: 54% of its 68 ground stops and delay programs started between 4 PM and 10 PM.
- 78% of its delay minutes came from the plane arriving late from an earlier flight.
Strong track record · 325 flights
Find Delta 2572 fares Opens this date on Aviasales
#5 · Alaska 709
7:15 AM → 10:26 AM3h 11m nonstop
Local times, typical schedule. Last flown 2026-05-31.
84%
chance on time
On time (history)
89%
Cancelled
1.9%
Avg arrival delay
11 min
- Arrived on time 89% of the time (151 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 86% on time; 6 to 9 PM: 75%).
- Departs inside SAN's trouble window: 66% of its 164 ground stops and delay programs started between 6 AM and noon.
Moderate track record · 151 flights
Find Alaska 709 fares Opens this date on Aviasales
#6 · Delta 2533
1:45 PM → 4:44 PM3h 08m nonstop
Local times, typical schedule. Last flown 2026-05-31.
84%
chance on time
On time (history)
85%
Cancelled
0.9%
Avg arrival delay
11 min
- Arrived on time 85% of the time (343 flights, Jun 2025 to May 2026).
- Departs outside SAN's trouble window (6 AM to noon, when 66% of its 164 ground stops and delay programs started).
- Lands inside SEA's trouble window: 54% of its 68 ground stops and delay programs started between 4 PM and 10 PM.
Strong track record · 343 flights
Find Delta 2533 fares Opens this date on Aviasales
#7 · Delta 2613
7:30 PM → 10:05 PM3h 14m nonstop
Local times, typical schedule. Last flown 2026-05-31.
82%
chance on time
On time (history)
83%
Cancelled
1.5%
Avg arrival delay
18 min
- Arrived on time 83% of the time (266 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: 86%).
- Departs outside SAN's trouble window (6 AM to noon, when 66% of its 164 ground stops and delay programs started).
- 53% of its delay minutes came from the plane arriving late from an earlier flight.
Strong track record · 266 flights
Find Delta 2613 fares Opens this date on Aviasales
#8 · Alaska 652
8:43 PM → 11:59 PM3h 14m nonstop
Local times, typical schedule. Last flown 2026-05-31.
80%
chance on time
On time (history)
87%
Cancelled
1.0%
Avg arrival delay
7 min
- Arrived on time 87% of the time (104 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: 86%).
- Departs outside SAN's trouble window (6 AM to noon, when 66% of its 164 ground stops and delay programs started).
Moderate track record · 104 flights
Find Alaska 652 fares Opens this date on Aviasales
#9 · Alaska 622
2:37 PM → 5:48 PM3h 10m nonstop
Local times, typical schedule. Last flown 2026-05-31.
79%
chance on time
On time (history)
83%
Cancelled
0.5%
Avg arrival delay
14 min
- Arrived on time 83% of the time (210 flights, Jun 2025 to May 2026).
- Departs outside SAN's trouble window (6 AM to noon, when 66% of its 164 ground stops and delay programs started).
- Lands inside SEA's trouble window: 54% of its 68 ground stops and delay programs started between 4 PM and 10 PM.
- 59% of its delay minutes came from the plane arriving late from an earlier flight.
Strong track record · 210 flights
Find Alaska 622 fares Opens this date on Aviasales
#10 · Alaska 1368
10:51 AM → 2:06 PM3h 15m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Alaska 1358; its record covers all of them.
79%
chance on time
On time (history)
85%
Cancelled
4.1%
Avg arrival delay
18 min
- Arrived on time 85% of the time (188 flights, Jun 2025 to May 2026).
- Cancelled 4.1% of the time (8 of 196).
- Departs inside SAN's trouble window: 66% of its 164 ground stops and delay programs started between 6 AM and noon.
- 57% of its delay minutes came from the plane arriving late from an earlier flight.
Moderate track record · 188 flights
Find Alaska 1368 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

Delta Air Lines86%
1,698 flights · 87% on time as flown · 1.1% cancel
Alaska Airlines76%
2,786 flights · 77% on time as flown · 2.1% cancel
Southwest Airlines66%
88 flights · 62% on time as flown · 1.1% cancel

On time by departure time

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

Before 9 AM86%
1,003 flights · avg delay 10 min
9 AM to noon84%
882 flights · avg delay 14 min
Noon to 3 PM79%
875 flights · avg delay 14 min
3 to 6 PM78%
925 flights · avg delay 14 min
6 to 9 PM75%
871 flights · avg delay 16 min

Best day: Tuesday (87%). 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

Late-arriving aircraft52%
Airline (crew, maintenance, boarding)30%
Air traffic control and airport volume17%

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

SAN to SEA questions

What time of day is best to fly SAN to SEA?: Before 9 AM: 86% 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 SAN to SEA?: Delta, with a season-adjusted 86% 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 SAN to SEA?: August (77% on time); the best was February (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 SAN

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