SAT to IAD flight delays
San Antonio, TX (SAT) Washington, VA (IAD) · 1,362 miles
641 flights · January 2025 – August 2026 · US Bureau of Transportation Statistics
93.66%
Arrived on time
Within 15 minutes of schedule
0.62%
Cancelled
Share of scheduled flights
80 min
When late, late by
Average across delayed arrivals
6 min
Delay per flight
Averaged over every flight flown
What the record says about this route
The shape of the lateness matters here. Flights on this route are not late often, but when they are late they are late by about 80 minutes — long enough to lose a connection or an evening. The on-time percentage looks reassuring and understates the consequence of being on the wrong flight.
Flights from San Antonio to Washington are among the most dependable in the record. A route this punctual is usually a short hop between airports with slots to spare.
This route does better than its own airport. Departures from SAT overall run 12.2 points less punctual than this particular one — so whatever congestion SAT has, this route is largely escaping it.
The two directions do not behave alike. IAD to SAT arrives on time 8.1 points less often than the outbound. Delay accumulates through the flying day, so whichever direction is scheduled later tends to carry the worse record — which is an argument for booking the morning departure if the choice exists.
Which airline should you fly on this route?
Over January 2025 – August 2026, United Airlines arrived on time most often on SAT to IAD. Flights ran closest to schedule in August and worst in July.
Every airline on SAT to IAD
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 |
|---|---|---|---|---|---|
| United Airlines | 641 | 93.66% | 0.62% | 80 min | A |
Month by month
Share of flights that arrived within 15 minutes of schedule, by month flown.
The return leg
IAD to SAT Washington back to San Antonio 85.56% on time BOther routes from San Antonio
Common questions
Are flights from San Antonio to Washington usually delayed?
93.66% of flights on the SAT to IAD route arrived within 15 minutes of schedule, so roughly 1 in every ten arrived late. That is better than the average route in this record.
Which airlines fly from San Antonio to Washington?
Only United Airlines appears in the published record on this route, with 641 flights and 93.66% arriving on time.
How often are SAT to IAD flights cancelled?
0.62% of scheduled flights did not operate — about 6 in every thousand. That is in the normal range.
What is the best month to fly San Antonio to Washington?
August, when 98% of flights arrived on time. The worst was July at 87.5%.
When SAT to IAD flights are late, how late are they?
About 80 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 IAD 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 →