Historical on-time performance
Baltimore to Seattle
2,335 miData through Dec 2025Source: US DOT · BTS
Flights on BWI–SEA arrive on time 67% of the time over the last 12 months.
On-time rate67%arrived within 15 min
p90 delay50 min1 in 10 flights is worse (tail risk)
Cancelled0.6%of scheduled flights
based on 625 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
Too close to call — no single carrier is clearly more on-time here.
- Southwest AirlinesOn-time72%Medianon timep9055 minCancel0.0%Flights92
- Alaska AirlinesOn-time66%Medianon timep9050 minCancel0.8%Flights533
Why flights run late
Delay causes
- Airline17%
- Weather14%
- Air traffic (NAS)32%
- Late aircraft36%
- Security1%
Most delay minutes here are attributed to Late aircraft.
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly BWI → SEA
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 63% to 77% on time.
- Mornings77% on time · p90 40 min · 645 flights
- Afternoons71% on time · p90 75 min · 173 flights · limited
- Evenings63% on time · p90 45 min · 935 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 64% to 75% on time.
- Tuesdays75% on time · p90 35 min · 235 flights
- Wednesdays71% on time · p90 45 min · 249 flights
- Thursdays70% on time · p90 40 min · 260 flights
- Sundays68% on time · p90 60 min · 263 flights
- Saturdays68% on time · p90 45 min · 241 flights
- Mondays66% on time · p90 45 min · 262 flights
- Fridays64% on time · p90 50 min · 261 flights
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