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Airport · 12 months to July 2026
Baltimore/Washington International Thurgood Marshall: delays and on-time record
Baltimore, Maryland
BTS: A flight is counted as on time if it arrived less than 15 minutes after its scheduled time. Only carriers with at least 0.5 percent of domestic scheduled passenger revenue report. Data through July 2026; this is a monthly history, not live airport status.
Reporting carriers scheduled 94,429 domestic departures from Baltimore/Washington International Thurgood Marshall (BWI), Baltimore, in the 12 months to July 2026: about 259 a day to 73 destinations.
71.7% of those flights left the gate less than 15 minutes late, 4.4 points below the national departure figure of 76.1%. Flights arriving at BWI were on time 78.5% of the time, 2.5 points above the national arrival figure of 76.0%.
1.8% of scheduled departures were cancelled (national: 1.8%), and the average departure delay, counting early and on-time departures as zero, was 16.5 min.
Southwest Airlines is the largest reporting carrier at BWI with 76% of departures. Among carriers with at least 944 departures, Delta Air Lines had the highest on-time arrival share for its BWI departures (84.1%) and Frontier Airlines the lowest (65.9%).
On-time departures are down 1.5 points on the previous 12 months (73.2%).
Of the delay minutes that carriers assigned to a BTS cause category for flights leaving BWI, late-arriving aircraft 40%, air carrier 34% and national aviation system 21%.
- On time 76.4%
- Arrived 15+ minutes late 21.7%
- Cancelled 1.8%
- Diverted 0.2%
As origin and as destination, against the nation
| Measure | Departures from BWI | Arrivals at BWI | All reported flights | BWI departures, previous 12 months |
|---|---|---|---|---|
| Departed on time (less than 15 min late) | 71.7% | 75.1% | 76.1% | 73.2% |
| Arrived on time | 76.4% | 78.5% | 76.0% | 76.4% |
| Cancelled | 1.8% | 1.7% | 1.8% | 1.4% |
| Diverted | 0.2% | 0.3% | 0.3% | 0.2% |
| Average departure delay (late minutes only) | 16.5 min | 14.4 min | 17.4 min | 17.2 min |
| Arrival delay minutes per 100 flights | 1,412 | 1,235 | 1,684 | 1,566 |
| Scheduled flights | 94,429 | 94,433 | 7,043,858 | 97,011 |
12 months to July 2026. The first column follows flights that left BWI; the second follows flights that landed there. Year on year, on-time departures moved −1.5 pts.
Airlines at BWI
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| WN Southwest Airlines | 72,159 | 76% | 76.1% | 5.8 min | 1.6% |
| DL Delta Air Lines | 5,308 | 6% | 84.1% | 1.1 min | 1.9% |
| UA United Airlines | 4,177 | 4% | 79.6% | 4.9 min | 1.0% |
| AA American Airlines | 3,470 | 4% | 78.8% | 7.4 min | 2.2% |
| F9 Frontier Airlines | 3,470 | 4% | 65.9% | 19.2 min | 3.4% |
| NK Spirit Airlines | 2,630 | 3% | 76.1% | 5.3 min | 2.9% |
| YX Republic Airline | 1,424 | 2% | 78.1% | 2.6 min | 3.9% |
| MQ Envoy Air | 964 | 1% | 74.7% | 7.8 min | 2.9% |
| AS Alaska Airlines | 679 | 1% | 71.6% | 6.7 min | 0.9% |
| B6 JetBlue Airways | 67 | 0% | 68.7% | 7.2 min | 4.5% |
| OH PSA Airlines | 52 | 0% | 76.9% | 4.0 min | 0.0% |
| OO SkyWest Airlines | 29 | 0% | 65.5% | 18.7 min | 0.0% |
Departures from BWI by reporting carrier, ordered by flights; on time means the flight reached its destination less than 15 minutes late. Green is at or above the airport's overall share of 76.4%. Carriers fly different routes at different hours, so the rows are not a like-for-like test.
Busiest routes from BWI
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| BWI–ATL | Baltimore to Atlanta | 5,407 | 78.8% | 4.1 min | 2.0% |
| BWI–MCO | Baltimore to Orlando | 4,682 | 73.6% | 9.5 min | 2.2% |
| BWI–BOS | Baltimore to Boston | 3,517 | 72.8% | 8.4 min | 2.8% |
| BWI–FLL | Baltimore to Fort Lauderdale | 3,135 | 73.5% | 7.5 min | 2.5% |
| BWI–CLT | Baltimore to Charlotte | 2,960 | 80.0% | 4.2 min | 1.7% |
| BWI–DEN | Baltimore to Denver | 2,814 | 75.8% | 5.5 min | 1.2% |
| BWI–ORD | Baltimore to Chicago | 2,689 | 73.9% | 13.7 min | 2.4% |
| BWI–TPA | Baltimore to Tampa | 2,673 | 77.7% | 3.9 min | 1.8% |
| BWI–MIA | Baltimore to Miami | 2,289 | 73.3% | 10.1 min | 2.2% |
| BWI–DTW | Baltimore to Detroit | 2,251 | 80.5% | 4.4 min | 1.9% |
| BWI–PVD | Baltimore to Providence | 1,867 | 78.5% | 3.2 min | 2.1% |
| BWI–MDW | Baltimore to Chicago | 1,838 | 73.8% | 8.7 min | 2.2% |
| BWI–BNA | Baltimore to Nashville | 1,812 | 78.7% | 3.4 min | 1.9% |
| BWI–DAL | Baltimore to Dallas | 1,803 | 74.9% | 5.1 min | 1.6% |
| BWI–RDU | Baltimore to Raleigh/Durham | 1,792 | 79.0% | 3.6 min | 2.5% |
| BWI–LAS | Baltimore to Las Vegas | 1,789 | 78.6% | 2.5 min | 0.8% |
| BWI–ALB | Baltimore to Albany | 1,760 | 80.0% | 3.0 min | 1.7% |
| BWI–BUF | Baltimore to Buffalo | 1,748 | 75.7% | 7.0 min | 1.9% |
| BWI–BDL | Baltimore to Hartford | 1,747 | 80.4% | 3.1 min | 2.1% |
| BWI–MHT | Baltimore to Manchester | 1,745 | 83.1% | 1.1 min | 1.1% |
| BWI–LAX | Baltimore to Los Angeles | 1,701 | 72.9% | 6.7 min | 1.3% |
| BWI–ORF | Baltimore to Norfolk | 1,549 | 77.9% | 3.5 min | 1.4% |
| BWI–HOU | Baltimore to Houston | 1,468 | 75.0% | 5.1 min | 1.4% |
| BWI–RSW | Baltimore to Fort Myers | 1,411 | 73.8% | 8.0 min | 1.9% |
| BWI–MSP | Baltimore to Minneapolis | 1,409 | 78.2% | 5.8 min | 1.8% |
| BWI–JAX | Baltimore to Jacksonville | 1,401 | 75.1% | 6.4 min | 1.6% |
| BWI–PWM | Baltimore to Portland | 1,342 | 79.7% | 2.8 min | 1.4% |
| BWI–DFW | Baltimore to Dallas/Fort Worth | 1,338 | 70.7% | 15.3 min | 2.9% |
| BWI–IAH | Baltimore to Houston | 1,310 | 77.6% | 4.9 min | 2.0% |
| BWI–STL | Baltimore to St. Louis | 1,268 | 81.4% | 1.9 min | 1.1% |
| BWI–AUS | Baltimore to Austin | 1,260 | 76.3% | 2.1 min | 1.6% |
| BWI–SRQ | Baltimore to Sarasota/Bradenton | 1,250 | 79.0% | 2.7 min | 1.5% |
| BWI–ISP | Baltimore to Islip | 1,236 | 76.6% | 6.4 min | 1.9% |
| BWI–CHS | Baltimore to Charleston | 1,234 | 78.8% | 3.6 min | 1.6% |
| BWI–PHX | Baltimore to Phoenix | 1,234 | 76.4% | 2.7 min | 0.9% |
| BWI–PBI | Baltimore to West Palm Beach/Palm Beach | 1,233 | 77.0% | 4.6 min | 1.5% |
| BWI–IND | Baltimore to Indianapolis | 1,219 | 76.5% | 6.5 min | 1.2% |
| BWI–SJU | Baltimore to San Juan | 1,162 | 65.3% | 18.7 min | 2.4% |
| BWI–SAN | Baltimore to San Diego | 1,159 | 74.1% | 4.9 min | 1.3% |
| BWI–MSY | Baltimore to New Orleans | 1,157 | 76.8% | 4.2 min | 1.3% |
| BWI–ROC | Baltimore to Rochester | 1,105 | 74.4% | 8.2 min | 1.4% |
| BWI–PIT | Baltimore to Pittsburgh | 1,075 | 77.5% | 5.7 min | 2.0% |
| BWI–CMH | Baltimore to Columbus | 1,056 | 78.3% | 6.3 min | 1.5% |
| BWI–SFO | Baltimore to San Francisco | 1,054 | 68.8% | 8.5 min | 0.9% |
| BWI–MYR | Baltimore to Myrtle Beach | 1,038 | 79.1% | 4.7 min | 1.3% |
| BWI–SAV | Baltimore to Savannah | 995 | 80.4% | 3.9 min | 0.9% |
| BWI–CLE | Baltimore to Cleveland | 970 | 76.1% | 6.4 min | 1.6% |
| BWI–SDF | Baltimore to Louisville | 890 | 78.8% | 4.1 min | 2.1% |
| BWI–MCI | Baltimore to Kansas City | 879 | 76.1% | 6.7 min | 1.6% |
| BWI–MKE | Baltimore to Milwaukee | 830 | 74.5% | 6.0 min | 2.0% |
| BWI–SLC | Baltimore to Salt Lake City | 769 | 75.9% | 7.6 min | 1.6% |
| BWI–SAT | Baltimore to San Antonio | 732 | 75.3% | 5.6 min | 1.6% |
| BWI–RIC | Baltimore to Richmond | 729 | 76.1% | 6.6 min | 2.1% |
| BWI–CVG | Baltimore to Cincinnati | 721 | 80.0% | 4.0 min | 1.5% |
| BWI–GSP | Baltimore to Greer | 720 | 80.4% | 4.6 min | 1.5% |
| BWI–SEA | Baltimore to Seattle | 719 | 70.2% | 8.3 min | 1.0% |
| BWI–GRR | Baltimore to Grand Rapids | 440 | 72.5% | 8.9 min | 1.6% |
| BWI–ABQ | Baltimore to Albuquerque | 402 | 75.6% | 4.4 min | 0.7% |
| BWI–SMF | Baltimore to Sacramento | 364 | 63.2% | 12.7 min | 0.8% |
| BWI–BHM | Baltimore to Birmingham | 336 | 80.4% | 2.3 min | 0.9% |
| BWI–ONT | Baltimore to Ontario | 281 | 63.0% | 14.2 min | 0.4% |
| BWI–MEM | Baltimore to Memphis | 280 | 80.4% | 1.9 min | 1.4% |
| BWI–SJC | Baltimore to San Jose | 242 | 62.8% | 14.6 min | 0.4% |
| BWI–VPS | Baltimore to Valparaiso | 241 | 86.3% | -1.4 min | 0.4% |
| BWI–PDX | Baltimore to Portland | 200 | 75.0% | 10.7 min | 0.0% |
| BWI–JAN | Baltimore to Jackson/Vicksburg | 191 | 83.8% | -3.1 min | 0.5% |
| BWI–TYS | Baltimore to Knoxville | 149 | 60.4% | 24.5 min | 2.7% |
| BWI–LGB | Baltimore to Long Beach | 128 | 71.9% | 7.6 min | 0.0% |
The 68 busiest of 73 routes with reported flights. Routes with at least 10 flights a month have their own page.
Month by month
By scheduled departure hour
Among hours with at least 1,889 departures, 6 am to 7 am had the highest on-time share (89.4% of 9,102 flights) and 10 pm to 11 pm the lowest (45.2% of 3,292).
Delay causes
Cancellations by reported reason (1,663 in the period): air carrier 23%, weather 64%, national aviation system 13%, security 0%.
Checkpoint volumes
TSA publishes daily checkpoint passenger counts for the country as a whole, not for BWI on its own. The national series through September 2026 is on the checkpoint volumes page.
Questions and answers
How often do flights leave BWI on time?
71.7% of the 94,429 scheduled domestic departures in the 12 months to July 2026 left less than 15 minutes late; the national figure was 76.1%. 1.8% were cancelled.
How often do flights arrive at BWI on time?
78.5% of 94,433 scheduled arrivals were on time by the BTS definition, against 76.0% nationally.
Which airline has the highest on-time share at BWI?
Counting departures from BWI and whether they reached their destination on time, Delta Air Lines had the highest share (84.1% of 5,308 flights), then United Airlines (79.6%) and American Airlines (78.8%). Carriers fly different routes at different hours, so the figures are not a like-for-like test.
What causes delays at BWI?
For departures from BWI that reached their destination 15 or more minutes late, carriers attributed the delay minutes as follows: late-arriving aircraft 40%, air carrier 34%, national aviation system 21%, extreme weather 5%, security 1%.
What time of day has the highest on-time share at BWI?
Departures scheduled from 6 am to 7 am local time left on time 89.4% of the time, the highest of any hour with enough flights to compare; 10 pm to 11 pm was lowest at 45.2%.
Is it getting better?
On-time departures for the 12 months to July 2026 were 71.7%, down 1.5 points on the previous 12 months (73.2%). The monthly chart shows each of the last 36 months, and each month has its own page.
Does this page show today's delays at BWI?
No. BTS publishes on-time records about two months after the month ends, so this page is a monthly history through July 2026. For live conditions use the FAA airport status service or your airline.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance (1987 to present), monthly files August 2023 to July 2026; airport name from the BTS airport lookup table. US government works in the public domain. Domestic scheduled flights by reporting carriers only: international flights, charters and smaller carriers are not in the source. Totals and averages only; no individual flight or aircraft is identified. See the methodology; report processing errors through corrections.