Route · IAD → SAT · 2020–2025 BTS data
Washington to San Antonio
According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), IAD to SAT (Washington to San Antonio) ranks #3180 of 4927 tracked domestic routes by total flights (most flights = #1).
Data updated 2026-06-13
- 84.2%
- On-time
- +5.2 pts
- vs US avg
- 86 min
- Delay when late
- 3,318
- Flights
- #3180 of 4927
- Corpus placement
Cancelled
1.1%
Best Month
Oct 2025 98%
Worst Month
Jul 2025 69%
Distance
1,362 mi
Carriers
7
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 58 | 12 | 0 | 0 | UA |
| Nov 2025 | 60 | 9 | 0 | 0 | UA |
| Oct 2025 | 55 | 1 | 0 | 0 | UA |
| Sep 2025 | 51 | 5 | 0 | 0 | UA |
| Aug 2025 | 51 | 5 | 0 | 0 | UA |
| Jul 2025 | 58 | 18 | 0 | 0 | UA |
| Jun 2025 | 51 | 15 | 0 | 0 | UA |
| May 2025 | 54 | 13 | 1 | 0 | UA |
| Apr 2025 | 56 | 8 | 0 | 0 | UA |
| Mar 2025 | 51 | 10 | 0 | 0 | UA |
| Feb 2025 | 48 | 8 | 0 | 0 | UA |
| Jan 2025 | 54 | 15 | 1 | 0 | UA |
| Dec 2024 | 55 | 7 | 0 | 0 | UA |
| Nov 2024 | 51 | 6 | 0 | 0 | UA |
| Oct 2024 | 57 | 3 | 0 | 0 | UA |
| Sep 2024 | 48 | 3 | 0 | 0 | UA |
| Aug 2024 | 54 | 12 | 2 | 0 | UA |
| Jul 2024 | 58 | 15 | 0 | 0 | UA |
| Jun 2024 | 54 | 12 | 0 | 0 | UA |
| May 2024 | 61 | 18 | 0 | 0 | UA |
| Apr 2024 | 60 | 5 | 0 | 0 | UA |
| Mar 2024 | 54 | 9 | 0 | 0 | UA |
| Feb 2024 | 52 | 3 | 0 | 0 | UA |
| Jan 2024 | 56 | 10 | 10 | 0 | UA |
IAD–SAT seasonal on-time pattern
Best: October (90.6%) · weakest: July (74.5%)
Strongest calendar month
October
90.6% on-time · ~50 flights/mo
Busiest calendar month
May
~53 flights/mo avg
Weakest calendar month
July
74.5% on-time · ~53 flights/mo
Cancellation Rate
1.1%
14 of 1,307 flights
Diversion Rate
0.0%
0 of 1,307 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
IAD - Washington
Full on-time, delay-cause, and seasonal performance for Washington, DC.
IAD on-time profileSAT - San Antonio
Full on-time, delay-cause, and seasonal performance for San Antonio, TX.
SAT on-time profileCompare the two airports
See IAD and SAT side by side on delays, cancellations, and reliability.
Compare IAD vs SATOrigin-hub reliability standing
Mid-pack among IAD departures
From IAD, this corridor sits with 42 other 75–85% on-time routes out of 58 tracked departures, not the hub's reliability leaders (14 at ≥85%) and not the softest ( 2 below 75%). Destination: San Antonio · fleet on-time rank #1513 of 4927.
Similar routes
Other BTS-tracked routes with comparable performance or trip length to IAD–SAT.
Routes with a similar on-time rate
What the Data Says About IAD to SAT
Bureau of Transportation Statistics records show Washington to San Antonio (IAD to SAT) running a 84.2% on-time rate over 3,318 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 85.9 minutes. The 1,362-mile corridor is served by 7 carriers, and over the last 24 months 1.1% of 1,307 flights were cancelled, 0.0% diverted.
The monthly split is wide on this route: Oct 2025 posted the strongest performance at 98% on-time, while Jul 2025 came in at just 69% - a 29-point swing worth factoring into travel timing.
On the multi-year calendar, IAD–SAT peaks in October at 90.6% on-time while May carries the heaviest traffic (~53 flights per month) ; the softest month is July at 74.5%, a 16.1-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.
Frequently Asked Questions
Where does IAD to SAT rank among US routes by traffic? ▼
How often are flights delayed from IAD to SAT? ▼
What is the cancellation rate for IAD to SAT? ▼
How far is the flight from IAD to SAT? ▼
When is the best time to fly from IAD to SAT? ▼
Airports on this route
Data source
Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.
Read our methodology - how this data is sourced, computed, and verified.
Using IAD–SAT data
IAD–SAT runs 5.2 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.
- Compare IAD and SAT airport profiles: delay causes and top routes differ even on the same corridor. IAD airport
- If your dates flex, October (90.6% on-time) beats July (74.5%) on this corridor. Seasonal chart
- 4 other routes post a similar 84.2% on-time rate; compare before you commit to this pairing. Similar routes
On-time rate reflects the BTS historical average across all reporting carriers on this origin–destination pair, not any single flight or booking recommendation.
Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.