Route · IAD → SAN · 2020–2025 BTS data
Washington to San Diego
The IAD–SAN corridor (Washington, DC → San Diego, CA) runs ahead of the national average, served by 3 carriers across roughly 2,253 miles.
Data updated 2026-06-13
- 85%
- On-time
- +6 pts
- vs US avg
- 68 min
- Delay when late
- 6,390
- Flights
Cancelled
1.3%
Best Month
Aug 2025 91%
Worst Month
Feb 2025 71%
Distance
2,253 mi
Carriers
3
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 122 | 26 | 0 | 2 | AS,UA |
| Nov 2025 | 115 | 23 | 0 | 0 | UA,AS |
| Oct 2025 | 119 | 11 | 0 | 3 | AS,UA |
| Sep 2025 | 119 | 12 | 0 | 3 | UA,AS |
| Aug 2025 | 124 | 11 | 1 | 0 | UA,AS |
| Jul 2025 | 122 | 35 | 0 | 0 | AS,UA |
| Jun 2025 | 120 | 31 | 0 | 0 | AS,UA |
| May 2025 | 124 | 27 | 0 | 1 | AS,UA |
| Apr 2025 | 120 | 27 | 1 | 1 | UA,AS |
| Mar 2025 | 124 | 20 | 0 | 1 | AS,UA |
| Feb 2025 | 112 | 33 | 0 | 0 | AS,UA |
| Jan 2025 | 124 | 26 | 1 | 1 | AS,UA |
| Dec 2024 | 124 | 30 | 0 | 3 | AS,UA |
| Nov 2024 | 118 | 22 | 0 | 1 | UA,AS |
| Oct 2024 | 124 | 29 | 0 | 1 | UA,AS |
| Sep 2024 | 119 | 15 | 1 | 0 | UA,AS |
| Aug 2024 | 124 | 25 | 1 | 1 | AS,UA |
| Jul 2024 | 124 | 30 | 1 | 0 | AS,UA |
| Jun 2024 | 120 | 18 | 0 | 1 | AS,UA |
| May 2024 | 146 | 25 | 0 | 0 | AS,UA |
| Apr 2024 | 150 | 23 | 0 | 0 | AS,UA |
| Mar 2024 | 155 | 20 | 0 | 0 | AS,UA |
| Feb 2024 | 143 | 19 | 1 | 0 | AS,UA |
| Jan 2024 | 143 | 19 | 31 | 0 | AS,UA |
Cancellation Rate
1.3%
38 of 3,035 flights
Diversion Rate
0.6%
19 of 3,035 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.
Origin airport →SAN - San Diego
Full on-time, delay-cause, and seasonal performance for San Diego, CA.
Destination airport →Compare the two airports
See IAD and SAN side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to IAD–SAN.
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What the Data Says About IAD to SAN
Washington to San Diego (IAD to SAN) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 85% on-time rate across 6,390 flights, with delays that do happen averaging 68.1 minutes. The corridor runs roughly 2,253 miles and is served by 3 carriers. Over the most recent 24 months, 38 of 3,035 flights were cancelled (1.3%) and 19 diverted (0.6%).
The monthly split is wide on this route: Aug 2025 posted the strongest performance at 91% on-time, while Feb 2025 came in at just 71% - a 21-point swing worth factoring into travel timing.
Frequently Asked Questions
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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.
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.