Route
PWM → BWI
Portland International Jetport Baltimore/Washington International Thurgood Marshall Airport
How punctual is this route?
- On-time arrivals
- 81.4%
- Less than 15 minutes late
- Cancelled
- 0.9%
- Of scheduled flights
- Average delay when late
- 64 min
- Flights arriving 15+ minutes late
- Flights tracked
- 1,331
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 33%
- Airline (crew, maintenance, cleaning) 31%
- Air traffic control & airport 28%
- Extreme weather 8%
- Security 1%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 90.9% | 121 |
| October 2025 | 89.4% | 123 |
| November 2025 | 87.0% | 108 |
| December 2025 | 73.8% | 108 |
| January 2026 | 78.5% | 97 |
| February 2026 | 86.5% | 94 |
| March 2026 | 77.1% | 106 |
| April 2026 | 79.6% | 103 |
| May 2026 | 82.1% | 106 |
| June 2026 | 86.3% | 117 |
| July 2026 | 77.3% | 124 |
| August 2026 | 67.7% | 124 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 – August 2026. Covers flights operated by reporting U.S. carriers. About our data
Airlines on this route
| Airline | Flights | On time | Cancelled | Avg. delay when late |
|---|---|---|---|---|
| Southwest Airlines | 1,331 | 81.4% | 0.9% | 64 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
WN1737
17% late · 64 flights
-
WN3414
26% late · 60 flights
-
WN4674
10% late · 59 flights
-
WN1317
22% late · 58 flights
-
WN1635
29% late · 58 flights
-
WN3293
15% late · 58 flights
-
WN3976
7% late · 58 flights
-
WN820
11% late · 58 flights
-
WN146
15% late · 46 flights
-
WN3252
20% late · 46 flights
-
WN2185
29% late · 39 flights
-
WN183
29% late · 35 flights
-
WN1770
9% late · 33 flights
-
WN431
25% late · 33 flights
-
WN4308
22% late · 32 flights
-
WN1326
6% late · 31 flights
-
WN1954
10% late · 31 flights
-
WN4149
13% late · 31 flights
-
WN3295
18% late · 30 flights
-
WN3335
14% late · 28 flights
-
WN3038
19% late · 27 flights
-
WN1647
12% late · 24 flights
-
WN3218
25% late · 24 flights
-
WN4393
21% late · 24 flights
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