BWI to BOS flight delays & on-time performance
Nonstop flights from Baltimore/Washington International Thurgood Marshall Airport to Boston Logan International Airport · 369 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at BWI or BOS right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Baltimore (BWI) to Boston (BOS) arrived on time 75% of the time in Aug 2025 – Jul 2026, worse than the 78% national average.
- 2.8% were cancelled, and 9% arrived an hour or more late.
- Republic Airways was the most punctual airline here (81% on time); Southwest Airlines was the least (72%).
- Departures scheduled around 8am did best (96% on time); around 6pm did worst (48%).
- Saturday was the most reliable day to fly (82% on time) and Sunday the least (68%).
- The largest source of delay minutes was air traffic control & airport congestion (39%).
Which airline is most on time from BWI to BOS?
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 |
|---|---|---|---|---|---|
| Republic AirwaysRegional airline operating flights for American Eagle, Delta Connection and United Express. | 81% | 3.7% | 16 min | 8.7% | 1,094 |
| Southwest Airlines | 72% | 2.4% | 18 min | 9.4% | 2,376 |
| Spirit Airlines | 71% | 4.3% | 13 min | 4.4% | 47 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 6am94%464 flights
- 7am92%74 flights
- 8am96%236 flights
- 9am90%156 flights
- 10am88%435 flights
- 11am84%113 flights
- 12pm78%108 flights
- 1pm60%247 flights
- 2pm69%220 flights
- 3pm70%279 flights
- 4pm48%145 flights
- 5pm53%179 flights
- 6pm48%133 flights
- 7pm69%284 flights
- 8pm63%163 flights
- 9pm63%134 flights
- 10pm65%147 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday72%4.5% cancelled
- Tuesday77%3.0% cancelled
- Wednesday76%1.2% cancelled
- Thursday74%2.5% cancelled
- Friday77%1.8% cancelled
- Saturday82%1.7% cancelled
- Sunday68%4.4% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Air traffic control & airport congestion39%
- Airline (crew, maintenance, cleaning, fueling)30%
- Late-arriving aircraft27%
- Extreme weather3%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather44%
- Air traffic control & airport congestion39%
- Airline (crew, maintenance, cleaning, fueling)17%
- Security0%
BWI to BOS: common questions
- How often are BWI to BOS flights on time?
- 75% 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 Baltimore to Boston cancelled?
- 2.8% of scheduled flights were cancelled (98 of 3,517).
- How long are typical delays?
- Across all flights the average arrival delay was 17 min (early arrivals count as zero). Flights that were late arrived 65 min behind schedule on average, and 9.1% of flights were an hour or more late.
- How long is taxi time at BWI?
- Flights on this route spent 17 min taxiing from the gate to takeoff on average.
Related routes
Return trip: BOS to BWI — 79% on time
More flights from Baltimore
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: BWI → BOS, nonstop flights by US airlines that report to the DOT. How we calculate this.