SAT to SEA flight delays
San Antonio, TX (SAT) Seattle, WA (SEA) · 1,774 miles
558 flights · January 2025 – August 2026 · US Bureau of Transportation Statistics
77.05%
Arrived on time
Within 15 minutes of schedule
1.43%
Cancelled
Share of scheduled flights
56 min
When late, late by
Average across delayed arrivals
14 min
Delay per flight
Averaged over every flight flown
What the record says about this route
The season swings this route hard. In September it ran 38.8 points more punctual than in March — a difference bigger than the one between the best and worst airlines on most routes. If the date is flexible, it is worth more than the carrier.
Only Alaska Airlines flies this route in the published record, so there is no choice to weigh — the route's figures and the airline's are the same figures.
This is a thin route — 558 flights across the whole period. On a route this infrequent a cancellation is far more costly than the rate suggests, because the next departure may not be the same day.
The San Antonio to Seattle route sits close to the middle of the record — neither notably punctual nor notably late.
Which airline should you fly on this route?
Over January 2025 – August 2026, Alaska Airlines arrived on time most often on SAT to SEA. Flights ran closest to schedule in September and worst in March.
Every airline on SAT to SEA
Ranked by how many flights each one operated. A carrier with fewer than 100 flights in the period is listed but not graded.
| Airline | Flights | On time | Cancelled | Avg delay | Grade |
|---|---|---|---|---|---|
| Alaska Airlines | 558 | 77.05% | 1.43% | 56 min | C |
Month by month
Share of flights that arrived within 15 minutes of schedule, by month flown.
The return leg
SEA to SAT Seattle back to San Antonio 76.41% on time COther routes from San Antonio
Common questions
Are flights from San Antonio to Seattle usually delayed?
77.05% of flights on the SAT to SEA route arrived within 15 minutes of schedule, so roughly 2 in every ten arrived late. That is about the same as the average route in this record.
Which airlines fly from San Antonio to Seattle?
Only Alaska Airlines appears in the published record on this route, with 558 flights and 77.05% arriving on time.
How often are SAT to SEA flights cancelled?
1.43% of scheduled flights did not operate — about 14 in every thousand. That is in the normal range.
What is the best month to fly San Antonio to Seattle?
September, when 93.6% of flights arrived on time. The worst was March at 54.8%.
When SAT to SEA flights are late, how late are they?
About 56 minutes on average across the flights that arrived more than 15 minutes behind schedule.
What these figures do and do not tell you
Everything on this page is counted from the flights that actually operated on SAT to SEA during January 2025 – August 2026, as reported by the airlines to the US Bureau of Transportation Statistics. "On time" is the federal definition: arriving at the gate within 15 minutes of the scheduled time.
A route's record is a description of the past, not a forecast. Weather, air traffic control and the aircraft's earlier flights that day drive most delays, and none of them are predictable from a historical rate. What the record does tell you is whether this route runs late more often than others, and which carrier on it has the better history — which is the part you can actually act on when you book.
Cancellations are counted separately from delays because they are a different problem for a traveller: a late flight still gets you there. How the grade is calculated →