Route Reliability

Route reliability

Baltimore (BWI) to Boston (BOS): which airline is most on time?

On-time arrivals, cancellations and long delays for every airline that reported nonstop flights from Baltimore, MD (BWI) to Boston, MA (BOS), September 2025 to August 2026.

Historical performance Official DOT data through August 2026 · Not live flight status

Baltimore, MDBoston, MA

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Three-letter airport codes, nonstop U.S. domestic flights. One direction at a time.

Route at a glance · September 2025 to August 2026

BWI to BOS

Baltimore, MD to Boston, MA

On time
71.6%vs 75.6% U.S. average Worse than average
Cancelled
3.2%vs 1.9% U.S. average Worse than average
60+ min late
9.2%vs 8.1% U.S. average Worse than average
Scheduled flights
3,540in 12 months3 airlines
Most reliable airline
Republic Airways77.1% on time · 1,099 flights

On time less often than the U.S. average, with more cancellations.

Compared with all U.S. flights, September 2025 to August 2026. “About average” means within 1.5 points for on time, 0.3 for cancelled and 1 for 60+ minutes late.

Airlines on this route

Ranked by on-time arrival

Airlines from BWI to BOS, September 2025 to August 2026. Rates are shares of all scheduled flights.
Airline On time Cancelled 60+ min late Avg delay when late Diverted Flights
1. Republic Airways Operating carrier; sold as American Eagle, Delta Connection, United Express Most reliable 77.1% 4.1% 8.6% 85 min 0.2% 1,099
2. Southwest Airlines 69.0% 2.8% 9.6% 61 min 0.2% 2,415
Spirit Airlines Insufficient sample (fewer than 50 flights) 26

On time = arrived within 15 minutes of schedule. Avg delay when late = average arrival delay of flights 15+ minutes late. "Most reliable" needs at least 300 flights in 12 months. Tap a heading to sort.

What this means

Republic Airways has the strongest record on this route.

  • Republic Airways had the best on-time record from Baltimore (BWI) to Boston (BOS): 77.1% of its 1,099 scheduled flights arrived within 15 minutes of schedule, compared with 69.0% for Southwest Airlines.
  • Spirit Airlines also flew this route but with fewer than 50 reported flights, too few to rate.
  • 3.2% of flights on this route were cancelled (about 1 in 31), 1.3 points higher than the U.S. average of 1.9%.
  • 9.2% of flights, about 1 in 11, arrived an hour or more late. When a flight was late (15+ minutes), the average arrival delay was 67 min.
  • Overall, 71.6% of flights on this route arrived on time, 4.0 points lower than the U.S. average of 75.6%.
  • Over the last 3 years, November was the most reliable month on this route (83.5% on time) and July the least reliable (64.8%).
  • Cancellations peaked in January, when 5.0% of flights were cancelled.
  • Flights scheduled to depart 8 am to 9 am were the most punctual (94.5% on time); flights scheduled to depart 4 pm to 5 pm were the least (42.3%).
  • In the other direction, Boston (BOS) to Baltimore (BWI), 75.8% of flights were on time and 2.9% were cancelled. Compare airlines BOS to BWI.

Best and worst months to fly BWI to BOS

Jan 77.3%
Feb 80.6%
Mar 77.8%
Apr 77.0%
May 66.7%
Jun 69.8%
Jul 64.8%
Aug 70.1%
Sep 66.1%
Oct 77.5%
Nov 83.5%
Dec 77.8%
Share of scheduled flights on time 12-month average 71.6%
All airlines combined, by calendar month, September 2023 to August 2026 (3 years pooled). Scale starts at zero.
Show as table
PeriodOn timeFlights
January 77.3% 834
February 80.6% 782
March 77.8% 884
April 77.0% 1,020
May 66.7% 1,042
June 69.8% 999
July 64.8% 1,029
August 70.1% 1,044
September 66.1% 1,000
October 77.5% 1,089
November 83.5% 1,019
December 77.8% 962
Best and worst calendar month by airline, September 2023 to August 2026.
AirlineBest monthWorst month
Republic Airways March (88.0%) September (68.4%)
Southwest Airlines November (81.2%) July (62.8%)

Month by month, last 12 months

Sep 59.4%
Oct 67.3%
Nov 80.2%
Dec 71.5%
Jan 79.1%
Feb 75.7%
Mar 71.8%
Apr 78.4%
May 74.1%
Jun 73.2%
Jul 66.3%
Aug 65.7%
Share of scheduled flights on time U.S. average 75.6%
All airlines combined, September 2025 to August 2026. Scale starts at zero.
Show as table
PeriodOn timeFlights
Sep 2025 59.4% 288
Oct 2025 67.3% 336
Nov 2025 80.2% 293
Dec 2025 71.5% 274
Jan 2026 79.1% 239
Feb 2026 75.7% 235
Mar 2026 71.8% 266
Apr 2026 78.4% 324
May 2026 74.1% 316
Jun 2026 73.2% 302
Jul 2026 66.3% 326
Aug 2026 65.7% 341

Best and worst departure times

6a 91.6%
7a 93.5%
8a 94.5%
9a 88.1%
10a 84.8%
11a 84.0%
12p 75.7%
1p 54.6%
2p 64.9%
3p 68.4%
4p 42.3%
5p 49.7%
6p 47.5%
7p 65.7%
8p 55.1%
9p 60.2%
10p 60.8%
Share of scheduled flights on time
By scheduled local departure hour at BWI, September 2025 to August 2026. Hours with no scheduled flights are omitted. Scale starts at zero.
Show as table
PeriodOn timeFlights
Departing 6 am to 7 am 91.6% 463
Departing 7 am to 8 am 93.5% 62
Departing 8 am to 9 am 94.5% 237
Departing 9 am to 10 am 88.1% 159
Departing 10 am to 11 am 84.8% 441
Departing 11 am to noon 84.0% 106
Departing noon to 1 pm 75.7% 111
Departing 1 pm to 2 pm 54.6% 269
Departing 2 pm to 3 pm 64.9% 222
Departing 3 pm to 4 pm 68.4% 269
Departing 4 pm to 5 pm 42.3% 156
Departing 5 pm to 6 pm 49.7% 153
Departing 6 pm to 7 pm 47.5% 160
Departing 7 pm to 8 pm 65.7% 289
Departing 8 pm to 9 pm 55.1% 167
Departing 9 pm to 10 pm 60.2% 133
Departing 10 pm to 11 pm 60.8% 143
Woman at an airport window watching a plane take off
Photo: Depositphotos (licensed stock, illustrative only). Credits

Sources & data dates

Source
U.S. DOT Bureau of Transportation Statistics, Reporting Carrier On-Time Performance (1987-present)
Period
September 2025 to August 2026 (12 months); month-of-year patterns September 2023 to August 2026
Data through
August 2026
Processed
2026-11-03
Scope
Nonstop scheduled flights from Baltimore, MD (BWI) to Boston, MA (BOS), one direction. Airlines that report to the DOT only.
Method
Rates use all scheduled flights as the denominator; cancelled and diverted flights count as not on time. Figures based on fewer than 50 scheduled flights are suppressed. Full methodology.

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