BOS to IAD flight delays & on-time performance
Nonstop flights from Boston Logan International Airport to Washington Dulles International Airport · 412 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at BOS or IAD right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Boston (BOS) to Washington (IAD) arrived on time 84% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 2.7% were cancelled, and 7% arrived an hour or more late.
- Departures scheduled around 5am did best (96% on time); around 7pm did worst (71%).
- Saturday was the most reliable day to fly (87% on time) and Thursday the least (80%).
- The largest source of delay minutes was late-arriving aircraft (45%).
Which airline is most on time from BOS to IAD?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| United Airlines | 84% | 2.3% | 13 min | 6.3% | 1,459 |
| Republic AirwaysRegional airline operating flights for American Eagle, Delta Connection and United Express. | 78% | 14.0% | 38 min | 14.3% | 57 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 5am96%346 flights
- 9am90%365 flights
- 12pm85%27 flights
- 1pm97%33 flights
- 2pm76%364 flights
- 6pm75%27 flights
- 7pm71%354 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday85%5.5% cancelled
- Tuesday85%4.3% cancelled
- Wednesday81%1.4% cancelled
- Thursday80%1.8% cancelled
- Friday86%0.4% cancelled
- Saturday87%1.4% cancelled
- Sunday81%4.1% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Late-arriving aircraft45%
- Air traffic control & airport congestion37%
- Airline (crew, maintenance, cleaning, fueling)17%
- Extreme weather1%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather80%
- Air traffic control & airport congestion20%
- Airline (crew, maintenance, cleaning, fueling)0%
- Security0%
BOS to IAD: common questions
- How often are BOS to IAD flights on time?
- 84% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Boston to Washington cancelled?
- 2.7% of scheduled flights were cancelled (41 of 1,516).
- How long are typical delays?
- Across all flights the average arrival delay was 14 min (early arrivals count as zero). Flights that were late arrived 80 min behind schedule on average, and 6.6% of flights were an hour or more late.
- How long is taxi time at BOS?
- Flights on this route spent 19 min taxiing from the gate to takeoff on average.
Related routes
Return trip: IAD to BOS — 77% on time
More flights from Boston
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: BOS → IAD, nonstop flights by US airlines that report to the DOT. How we calculate this.