Historical on-time performance
Chicago to Seattle
1,733 miData through Dec 2025Source: US DOT · BTS
Flights on MDW–SEA arrive on time 67% of the time over the last 12 months.
On-time rate67%arrived within 15 min
p90 delay45 min1 in 10 flights is worse (tail risk)
Cancelled0.4%of scheduled flights
based on 557 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time67%Medianon timep9045 minCancel0.4%Flights557
Why flights run late
Delay causes
- Airline33%
- Weather3%
- Air traffic (NAS)22%
- Late aircraft40%
- 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 MDW → 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 59% to 78% on time.
- Middays78% on time · p90 25 min · 402 flights
- Mornings74% on time · p90 30 min · 409 flights
- Evenings66% on time · p90 55 min · 169 flights · limited
- Afternoons61% on time · p90 55 min · 446 flights
- Overnights59% on time · p90 55 min · 253 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 63% to 72% on time.
- Wednesdays72% on time · p90 40 min · 245 flights
- Tuesdays71% on time · p90 45 min · 245 flights
- Mondays71% on time · p90 35 min · 247 flights
- Sundays69% on time · p90 50 min · 227 flights
- Thursdays67% on time · p90 40 min · 245 flights
- Fridays64% on time · p90 50 min · 245 flights
- Saturdays63% on time · p90 50 min · 225 flights
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