BOS to IAD flight delays
Boston, MA (BOS) Washington, VA (IAD) · 412 miles
120 flights · March 2025 – August 2026 · US Bureau of Transportation Statistics
83.05%
Arrived on time
Within 15 minutes of schedule
1.67%
Cancelled
Share of scheduled flights
83 min
When late, late by
Average across delayed arrivals
15 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 83 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.
Only United Airlines flies this route in the published record, so there is no choice to weigh — the route's figures and the airline's are the same figures.
Flights from Boston to Washington keep to schedule more reliably than most. On a route this punctual the day you fly matters more than the airline you pick.
Which airline should you fly on this route?
Over March 2025 – August 2026, United Airlines arrived on time most often on BOS to IAD.
Every airline on BOS 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 | 120 | 83.05% | 1.67% | 83 min | B |
The return leg
IAD to BOS Washington back to Boston 81.2% on time COther routes from Boston
Common questions
Are flights from Boston to Washington usually delayed?
83.05% of flights on the BOS to IAD route arrived within 15 minutes of schedule, so roughly 2 in every ten arrived late. That is better than the average route in this record.
Which airlines fly from Boston to Washington?
Only United Airlines appears in the published record on this route, with 120 flights and 83.05% arriving on time.
How often are BOS to IAD flights cancelled?
1.67% of scheduled flights did not operate — about 17 in every thousand. That is in the normal range.
When BOS to IAD flights are late, how late are they?
About 83 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 BOS to IAD during March 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 →