BWI to PWM flight delays & on-time performance
Nonstop flights from Baltimore/Washington International Thurgood Marshall Airport to Portland International Jetport · 452 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at BWI or PWM right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Baltimore (BWI) to Portland (PWM) arrived on time 81% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 1.4% were cancelled, and 3% arrived an hour or more late.
- Southwest Airlines is the only airline reporting nonstop flights on this route.
- Departures scheduled around 11am did best (100% on time); around 10pm did worst (60%).
- Friday was the most reliable day to fly (84% on time) and Sunday the least (71%).
- The largest source of delay minutes was late-arriving aircraft (52%).
Which airline is most on time from BWI to PWM?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| Southwest Airlines | 81% | 1.4% | 10 min | 3.4% | 1,342 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 8am96%114 flights
- 9am92%76 flights
- 10am88%231 flights
- 11am100%41 flights
- 12pm79%81 flights
- 1pm84%151 flights
- 2pm86%57 flights
- 3pm76%117 flights
- 4pm85%27 flights
- 5pm56%28 flights
- 6pm88%32 flights
- 7pm57%22 flights
- 8pm82%96 flights
- 9pm68%124 flights
- 10pm60%145 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday82%2.5% cancelled
- Tuesday83%2.2% cancelled
- Wednesday84%0.0% cancelled
- Thursday77%0.5% cancelled
- Friday84%1.0% cancelled
- Saturday84%1.1% cancelled
- Sunday71%2.6% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Late-arriving aircraft52%
- Airline (crew, maintenance, cleaning, fueling)32%
- Air traffic control & airport congestion10%
- Extreme weather6%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather74%
- Air traffic control & airport congestion16%
- Airline (crew, maintenance, cleaning, fueling)11%
- Security0%
BWI to PWM: common questions
- How often are BWI to PWM flights on time?
- 81% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Baltimore to Portland cancelled?
- 1.4% of scheduled flights were cancelled (19 of 1,342).
- How long are typical delays?
- Across all flights the average arrival delay was 10 min (early arrivals count as zero). Flights that were late arrived 45 min behind schedule on average, and 3.4% of flights were an hour or more late.
- How long is taxi time at BWI?
- Flights on this route spent 14 min taxiing from the gate to takeoff on average.
Related routes
Return trip: PWM to BWI — 83% on time
More flights from Baltimore
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: BWI → PWM, nonstop flights by US airlines that report to the DOT. How we calculate this.