SEA to SAT flight delays
Seattle, WA (SEA) San Antonio, TX (SAT) · 1,774 miles
1,151 flights · July 2024 – July 2026 · US Bureau of Transportation Statistics
75.83%
Arrived on time
Within 15 minutes of schedule
0.61%
Cancelled
Share of scheduled flights
41 min
When late, late by
Average across delayed arrivals
11 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 34.7 points more punctual than in August — 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.
Flights from Seattle to San Antonio run late more often than the average route, though not severely.
Which airline should you fly on this route?
Over July 2024 – July 2026, Alaska Airlines arrived on time most often on SEA to SAT. Flights ran closest to schedule in February and worst in August.
Every airline on SEA to SAT
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 | 1,151 | 75.83% | 0.61% | 41 min | C |
Month by month
Share of flights that arrived within 15 minutes of schedule, by month flown.
The return leg
SAT to SEA San Antonio back to Seattle 74.96% on time COther routes from Seattle
Common questions
Are flights from Seattle to San Antonio usually delayed?
75.83% of flights on the SEA to SAT 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 Seattle to San Antonio?
Only Alaska Airlines appears in the published record on this route, with 1,151 flights and 75.83% arriving on time.
How often are SEA to SAT flights cancelled?
0.61% of scheduled flights did not operate — about 6 in every thousand. That is in the normal range.
What is the best month to fly Seattle to San Antonio?
September, when 93.6% of flights arrived on time. The worst was August at 58.9%.
When SEA to SAT flights are late, how late are they?
About 41 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 SEA to SAT during July 2024 – July 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 →