FlightRecord

Baltimore/Washington International Thurgood Marshall Airport (BWI): Delays & On-Time Performance

Data through May 2026

Baltimore/Washington International Thurgood Marshall Airport (BWI) is a tale of two seasons: departures ran 84% on-time in November 2024 but sank to 56% in July 2024. Across the year it averages 73% against a national 78%, over roughly 262 departures a day to 76 destinations.

Departures on-time
73%
left <15 min late
Avg dep delay
17 min
Arrivals on-time
80%
Cancelled
1.5%
Destinations
76
nonstop
Airlines
13

Monthly on-time trend

Monthly departure on-time percentage at BWI50%75%100%June 2024: 65% on-time (8,779 flights)65Jun 2024July 2024: 56% on-time (9,069 flights)56August 2024: 64% on-time (8,940 flights)64September 2024: 80% on-time (8,273 flights)80Sep 2024October 2024: 81% on-time (8,402 flights)81November 2024: 84% on-time (7,796 flights)84December 2024: 73% on-time (7,908 flights)73Dec 2024January 2025: 80% on-time (7,094 flights)80February 2025: 80% on-time (6,571 flights)80March 2025: 77% on-time (7,927 flights)77Mar 2025April 2025: 79% on-time (8,107 flights)79May 2025: 71% on-time (8,411 flights)71June 2025: 65% on-time (8,660 flights)65Jun 2025July 2025: 62% on-time (8,922 flights)62August 2025: 75% on-time (8,381 flights)75September 2025: 82% on-time (7,968 flights)82Sep 2025October 2025: 76% on-time (8,475 flights)76November 2025: 80% on-time (7,721 flights)80December 2025: 68% on-time (7,863 flights)68Dec 2025January 2026: 81% on-time (6,934 flights)81February 2026: 77% on-time (6,552 flights)77March 2026: 66% on-time (7,803 flights)66Mar 2026April 2026: 76% on-time (8,041 flights)76May 2026: 72% on-time (8,161 flights)72

Best time of day to depart from BWI

On-time percentage by scheduled departure hour at BWI5 a.m.: 93% on-time (1,669 flights)56 a.m.: 91% on-time (18,147 flights)67 a.m.: 89% on-time (7,166 flights)78 a.m.: 88% on-time (18,960 flights)89 a.m.: 81% on-time (10,178 flights)910 a.m.: 83% on-time (14,247 flights)1011 a.m.: 80% on-time (9,475 flights)1112 p.m.: 78% on-time (7,825 flights)121 p.m.: 74% on-time (9,486 flights)132 p.m.: 71% on-time (9,802 flights)143 p.m.: 66% on-time (11,132 flights)154 p.m.: 67% on-time (10,275 flights)165 p.m.: 64% on-time (10,883 flights)176 p.m.: 65% on-time (13,216 flights)187 p.m.: 60% on-time (11,645 flights)198 p.m.: 60% on-time (12,206 flights)209 p.m.: 55% on-time (9,774 flights)2110 p.m.: 46% on-time (6,631 flights)22scheduled departure hour

Busiest routes from BWI

RouteFlights/12moOn-timeAvg delay
BWI → ATL5,43179%16 min
BWI → MCO4,74776%18 min
BWI → BOS3,61376%17 min
BWI → FLL3,16577%16 min
BWI → CLT3,04377%20 min
BWI → DEN2,92077%15 min
BWI → TPA2,76678%16 min
BWI → ORD2,68878%19 min

Most reliable routes

  1. BWI → VPS88%
  2. BWI → MEM82%
  3. BWI → MSP81%
  4. BWI → DTW81%
  5. BWI → STL80%

Most delay-prone routes

  1. BWI → SMF62%
  2. BWI → ONT64%
  3. BWI → SEA67%
  4. BWI → SJC68%
  5. BWI → SJU69%

Airline performance at BWI

AirlineOn-time departuresAvg delayFlights
United Airlines87%12 min7,945
Delta Air Lines84%14 min10,608
Republic Airways84%15 min2,388
Endeavor Air82%21 min278
Envoy Air80%16 min1,718
American Airlines79%22 min7,233
PSA Airlines78%13 min140
Spirit Airlines77%19 min10,269
Southwest Airlines71%17 min144,738
Alaska Airlines70%16 min1,195
Frontier Airlines70%30 min6,103

Frequently asked questions

How often are flights delayed at BWI?
27% of departures from Baltimore/Washington International Thurgood Marshall Airport left 15+ minutes late between 2024-06 and 2026-05, with an average departure delay of 17 minutes. The national on-time average over the same period was 78%.
What is the best time of day to depart from BWI?
Flights scheduled around 5 a.m. depart on time 93% of the time at BWI, versus 46% around 10 p.m.. Booking before noon is the usual rule of thumb here.
What is the worst month for delays at BWI?
In this dataset, July 2024 was the weakest month at BWI, with 56% of departures on time.
How often are flights cancelled at BWI?
1.5% of scheduled departures from BWI were cancelled in this period, compared with a national rate of 1.6%.

Popular route pages from this airport

Based on 192,758 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.