Route on-time record
SAT to SEA: most on-time flights and the best time to fly
San Antonio (San Antonio International Airport) to Seattle (Seattle–Tacoma International Airport). 558 nonstop flights in Jun 2025 to May 2026, 75% arrived within 15 minutes and 1.4% were cancelled. The most reliable flight number was Alaska 495 at 7:00 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
SAT → SEA
San Antonio to Seattle: 558 nonstop flights a year
On time (12 months)
75%
Cancelled
1.4%
avg delay 14 min
Best time to leave
3 to 6 PM
83% on time vs 66% 6 to 9 PM
Most reliable airline
Alaska
74% chance on time
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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 495
7:00 AM → 9:35 AM4h 35m nonstop
Local times, typical schedule. Last flown 2026-05-31.
84%
chance on time
- On time (history)
- 87%
- Cancelled
- 1.9%
- Avg arrival delay
- 12 min
- Arrived on time 87% of the time (152 flights, Jun 2025 to May 2026).
Moderate track record · 152 flights
Find Alaska 495 fares Opens this date on Aviasales#2 · Alaska 494
5:50 PM → 8:26 PM4h 36m nonstop
Local times, typical schedule. Last flown 2026-05-31.
68%
chance on time
- On time (history)
- 67%
- Cancelled
- 1.2%
- Avg arrival delay
- 17 min
- Arrived on time 67% of the time (254 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (3 to 6 PM: 83% on time; 6 to 9 PM: 66%).
- Lands inside SEA's trouble window: 54% of its 68 ground stops and delay programs started between 4 PM and 10 PM.
- 54% of its delay minutes came from the plane arriving late from an earlier flight.
Strong track record · 254 flights
Find Alaska 494 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Alaska Airlines74%
558 flights · 75% on time as flown · 1.4% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM83%
240 flights · avg delay 12 min
- 3 to 6 PM83%
54 flights · avg delay 8 min
- 6 to 9 PM66%
264 flights · avg delay 18 min
Best day: Wednesday (77%). Worst: Sunday (65%).
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 aircraft47%
- Airline (crew, maintenance, boarding)31%
- Air traffic control and airport volume19%
- Severe weather3%
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
SAT to SEA questions
- What time of day is best to fly SAT to SEA?
- 3 to 6 PM: 83% of flights arrived on time, against 66% for departures 6 to 9 PM.
- Which airline is most on time from SAT to SEA?
- Alaska, with a season-adjusted 74% chance of operating and arriving on time over 558 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 SAT to SEA?
- June (61% on time); the best was November (81%), 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 SAT
- SEA to SAT (return)
- SAT to DFW 77%
- SAT to ATL 85%
- SAT to DEN 81%
- SAT to DAL 84%
- SAT to PHX 83%
- SAT to IAH 81%
- SAT to LAS 83%
- SAT to ORD 76%
- SAT to LAX 87%
- SAT to HOU 74%
- SAT to CLT 86%
- SAT to MCO 77%
Most on-time flights from SAT on every route →
Live status: FAA delays and ground stops