Route · BOS → IAD · 2020–2025 BTS data
Boston to Washington
According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), BOS to IAD (Boston to Washington) ranks #1651 of 4927 tracked domestic routes by total flights (most flights = #1).
Data updated 2026-06-13
- 85%
- On-time
- +6 pts
- vs US avg
- 78 min
- Delay when late
- 7,615
- Flights
- #1651 of 4927
- Corpus placement
Cancelled
0.8%
Best Month
Feb 2024 97%
Worst Month
Jul 2025 73%
Distance
413 mi
Carriers
9
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 122 | 20 | 0 | 0 | YX,UA |
| Nov 2025 | 119 | 15 | 2 | 0 | UA |
| Oct 2025 | 124 | 33 | 1 | 0 | UA |
| Sep 2025 | 143 | 26 | 2 | 0 | UA |
| Aug 2025 | 133 | 27 | 0 | 0 | UA |
| Jul 2025 | 124 | 34 | 2 | 1 | UA |
| Jun 2025 | 146 | 35 | 0 | 0 | UA |
| May 2025 | 155 | 30 | 0 | 0 | UA,YX |
| Apr 2025 | 154 | 27 | 0 | 0 | UA |
| Mar 2025 | 125 | 16 | 0 | 0 | UA |
| Feb 2025 | 112 | 18 | 3 | 0 | UA |
| Jan 2025 | 124 | 23 | 2 | 0 | YX,UA |
| Dec 2024 | 124 | 17 | 1 | 0 | UA,YX |
| Nov 2024 | 119 | 18 | 0 | 0 | UA |
| Oct 2024 | 124 | 14 | 0 | 0 | UA |
| Sep 2024 | 120 | 8 | 0 | 0 | UA |
| Aug 2024 | 124 | 20 | 5 | 1 | UA |
| Jul 2024 | 124 | 30 | 1 | 0 | UA |
| Jun 2024 | 120 | 25 | 0 | 0 | UA |
| May 2024 | 124 | 14 | 0 | 0 | UA |
| Apr 2024 | 120 | 13 | 0 | 0 | UA |
| Mar 2024 | 124 | 20 | 0 | 0 | UA |
| Feb 2024 | 116 | 3 | 1 | 0 | UA |
| Jan 2024 | 124 | 25 | 4 | 0 | UA |
BOS–IAD seasonal on-time pattern
Best: November (89.8%) · weakest: July (74.3%)
Strongest calendar month
November
89.8% on-time · ~108 flights/mo
Busiest calendar month
October
~111 flights/mo avg
Weakest calendar month
July
74.3% on-time · ~108 flights/mo
Cancellation Rate
0.8%
24 of 3,044 flights
Diversion Rate
0.1%
2 of 3,044 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
BOS - Boston
Full on-time, delay-cause, and seasonal performance for Boston, MA.
BOS on-time profileIAD - Washington
Full on-time, delay-cause, and seasonal performance for Washington, DC.
IAD on-time profileCompare the two airports
See BOS and IAD side by side on delays, cancellations, and reliability.
Compare BOS vs IADOrigin-hub reliability standing
Among BOS's stronger departures
BOS → IAD posts a 85% on-time rate, landing in the ≥85% band with 6 of 60 BTS-tracked routes leaving Boston. The same hub also shows 49 mid-band and 5 challenged departures · fleet-wide on-time rank #1206 of 4927 (highest on-time = #1).
Similar routes
Other BTS-tracked routes with comparable performance or trip length to BOS–IAD.
Routes with a similar on-time rate
What the Data Says About BOS to IAD
Boston to Washington (BOS to IAD) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 85% on-time rate across 7,615 flights, with delays that do happen averaging 78.4 minutes. The corridor runs roughly 413 miles and is served by 9 carriers. Over the most recent 24 months, 24 of 3,044 flights were cancelled (0.8%) and 2 diverted (0.1%).
The monthly split is wide on this route: Feb 2024 posted the strongest performance at 97% on-time, while Jul 2025 came in at just 73% - a 25-point swing worth factoring into travel timing.
On the multi-year calendar, BOS–IAD peaks in November at 89.8% on-time while October carries the heaviest traffic (~111 flights per month) ; the softest month is July at 74.3%, a 15.5-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.
Frequently Asked Questions
Where does BOS to IAD rank among US routes by traffic? ▼
How often are flights delayed from BOS to IAD? ▼
What is the cancellation rate for BOS to IAD? ▼
How far is the flight from BOS to IAD? ▼
When is the best time to fly from BOS to IAD? ▼
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 BOS–IAD data
BOS–IAD runs 6 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.
- Compare BOS and IAD airport profiles: delay causes and top routes differ even on the same corridor. BOS airport
- If your dates flex, November (89.8% on-time) beats July (74.3%) on this corridor. Seasonal chart
- 4 other routes post a similar 85% 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.