Route · IAD → BOS · 2020–2025 BTS data
Washington to Boston
The IAD–BOS corridor (Washington, DC → Boston, MA) runs ahead of the national average, served by 9 carriers across roughly 413 miles.
Data updated 2026-06-13
- 80.6%
- On-time
- +1.6 pts
- vs US avg
- 75 min
- Delay when late
- 7,619
- Flights
Cancelled
1.1%
Best Month
Feb 2024 92%
Worst Month
Sep 2025 58%
Distance
413 mi
Carriers
9
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 122 | 29 | 0 | 0 | YX,UA |
| Nov 2025 | 119 | 26 | 2 | 0 | UA |
| Oct 2025 | 124 | 32 | 1 | 0 | UA |
| Sep 2025 | 142 | 59 | 2 | 0 | UA |
| Aug 2025 | 134 | 27 | 0 | 0 | UA |
| Jul 2025 | 124 | 36 | 2 | 0 | UA |
| Jun 2025 | 145 | 55 | 0 | 0 | UA |
| May 2025 | 155 | 59 | 0 | 0 | UA,YX |
| Apr 2025 | 154 | 28 | 0 | 0 | UA |
| Mar 2025 | 126 | 24 | 0 | 0 | UA |
| Feb 2025 | 112 | 15 | 3 | 0 | UA |
| Jan 2025 | 124 | 13 | 4 | 0 | YX,UA |
| Dec 2024 | 124 | 22 | 1 | 0 | UA,YX |
| Nov 2024 | 119 | 22 | 0 | 0 | UA |
| Oct 2024 | 124 | 13 | 0 | 0 | UA |
| Sep 2024 | 120 | 27 | 0 | 0 | UA |
| Aug 2024 | 124 | 42 | 2 | 0 | UA |
| Jul 2024 | 124 | 36 | 1 | 0 | UA |
| Jun 2024 | 120 | 26 | 0 | 0 | UA |
| May 2024 | 124 | 35 | 0 | 1 | UA |
| Apr 2024 | 120 | 24 | 1 | 0 | UA |
| Mar 2024 | 124 | 17 | 0 | 0 | UA |
| Feb 2024 | 115 | 9 | 0 | 0 | UA |
| Jan 2024 | 124 | 19 | 15 | 1 | UA |
Cancellation Rate
1.1%
34 of 3,043 flights
Diversion Rate
0.1%
2 of 3,043 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 →BOS - Boston
Full on-time, delay-cause, and seasonal performance for Boston, MA.
Destination airport →Compare the two airports
See IAD and BOS 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–BOS.
Routes with a similar on-time rate
What the Data Says About IAD to BOS
7,619 tracked flights put the IAD to BOS pairing (Washington to Boston) at a 80.6% on-time rate, squarely in line with the wider network. Delays that do occur run 75.3 minutes on average. Across the 413-mile route and its 9 carriers, the trailing 24 months show 1.1% cancelled and 0.1% diverted (3,043 flights sampled).
The monthly split is wide on this route: Feb 2024 posted the strongest performance at 92% on-time, while Sep 2025 came in at just 58% - a 34-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.