Route Reliability

Route reliability

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

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

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

Boston, MABaltimore, MD

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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

BOS to BWI

Boston, MA to Baltimore, MD

On time
75.8%vs 75.6% U.S. average About average
Cancelled
2.9%vs 1.9% U.S. average Worse than average
60+ min late
7.5%vs 8.1% U.S. average About average
Scheduled flights
3,536in 12 months3 airlines
Most reliable airline
Republic Airways78.1% on time · 1,099 flights

On time about as often as 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 BOS to BWI, 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 78.1% 4.3% 6.5% 68 min 0.3% 1,099
2. Southwest Airlines 74.7% 2.3% 8.0% 67 min 0.4% 2,413
Spirit Airlines Insufficient sample (fewer than 50 flights) 24

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 Boston (BOS) to Baltimore (BWI): 78.1% of its 1,099 scheduled flights arrived within 15 minutes of schedule, compared with 74.7% for Southwest Airlines.
  • Spirit Airlines also flew this route but with fewer than 50 reported flights, too few to rate.
  • 2.9% of flights on this route were cancelled (about 1 in 34), 1.0 points higher than the U.S. average of 1.9%.
  • 7.5% of flights, about 1 in 13, arrived an hour or more late. When a flight was late (15+ minutes), the average arrival delay was 67 min.
  • Overall, 75.8% of flights on this route arrived on time, about the same as the U.S. average of 75.6%.
  • Over the last 3 years, November was the most reliable month on this route (85.5% on time) and July the least reliable (66.9%).
  • Cancellations peaked in January, when 5.3% of flights were cancelled.
  • Flights scheduled to depart 7 am to 8 am were the most punctual (93.6% on time); flights scheduled to depart 8 pm to 9 pm were the least (46.4%).
  • In the other direction, Baltimore (BWI) to Boston (BOS), 71.6% of flights were on time and 3.2% were cancelled. Compare airlines BWI to BOS.

Best and worst months to fly BOS to BWI

Jan 81.5%
Feb 81.7%
Mar 84.4%
Apr 82.2%
May 77.2%
Jun 72.8%
Jul 66.9%
Aug 74.0%
Sep 77.3%
Oct 80.1%
Nov 85.5%
Dec 82.7%
Share of scheduled flights on time 12-month average 75.8%
All airlines combined, by calendar month, September 2023 to August 2026 (3 years pooled). Scale starts at zero.
Show as table
PeriodOn timeFlights
January 81.5% 826
February 81.7% 772
March 84.4% 883
April 82.2% 1,004
May 77.2% 1,025
June 72.8% 998
July 66.9% 1,028
August 74.0% 1,046
September 77.3% 1,002
October 80.1% 1,089
November 85.5% 1,015
December 82.7% 964
Best and worst calendar month by airline, September 2023 to August 2026.
AirlineBest monthWorst month
Republic Airways November (87.9%) July (71.4%)
Southwest Airlines February (85.1%) July (66.2%)

Month by month, last 12 months

Sep 74.0%
Oct 68.8%
Nov 79.3%
Dec 78.2%
Jan 82.8%
Feb 79.4%
Mar 80.8%
Apr 79.8%
May 79.4%
Jun 76.6%
Jul 64.4%
Aug 70.7%
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 74.0% 288
Oct 2025 68.8% 337
Nov 2025 79.3% 290
Dec 2025 78.2% 275
Jan 2026 82.8% 239
Feb 2026 79.4% 233
Mar 2026 80.8% 266
Apr 2026 79.8% 322
May 2026 79.4% 316
Jun 2026 76.6% 303
Jul 2026 64.4% 326
Aug 2026 70.7% 341

Best and worst departure times

<6a 92.7%
6a 93.5%
7a 93.6%
8a 86.9%
9a 92.1%
10a 89.8%
11a 83.8%
12p 85.4%
1p 81.0%
2p 76.7%
3p 69.5%
4p 55.7%
5p 64.6%
6p 47.2%
7p 50.7%
8p 46.4%
9p 48.7%
10p Insufficient sample
Share of scheduled flights on time
By scheduled local departure hour at BOS, September 2025 to August 2026. Hours with no scheduled flights are omitted. Scale starts at zero.
Show as table
PeriodOn timeFlights
Departing before 6 am 92.7% 343
Departing 6 am to 7 am 93.5% 169
Departing 7 am to 8 am 93.6% 188
Departing 8 am to 9 am 86.9% 312
Departing 9 am to 10 am 92.1% 202
Departing 10 am to 11 am 89.8% 118
Departing 11 am to noon 83.8% 136
Departing noon to 1 pm 85.4% 171
Departing 1 pm to 2 pm 81.0% 284
Departing 2 pm to 3 pm 76.7% 210
Departing 3 pm to 4 pm 69.5% 295
Departing 4 pm to 5 pm 55.7% 106
Departing 5 pm to 6 pm 64.6% 390
Departing 6 pm to 7 pm 47.2% 127
Departing 7 pm to 8 pm 50.7% 150
Departing 8 pm to 9 pm 46.4% 181
Departing 9 pm to 10 pm 48.7% 119
Departing 10 pm to 11 pm Insufficient sample 35
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 Boston, MA (BOS) to Baltimore, MD (BWI), 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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