Historical on-time performance
Grand Rapids to Chicago
137 miData through May 2026Source: US DOT · BTS
Flights on GRR–MDW arrive on time 77% of the time over the last 12 months.
On-time rate77%arrived within 15 min
p90 delay30 min1 in 10 flights is worse (tail risk)
Cancelled0.4%of scheduled flights
based on 928 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time77%Medianon timep9030 minCancel0.4%Flights928
Why flights run late
Delay causes
- Airline25%
- Weather2%
- Air traffic (NAS)34%
- Late aircraft39%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline0%
- Weather75%
- Air traffic (NAS)25%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 4 cancellations with a reported cause (BTS reports causes from June 2003).
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly GRR → MDW
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
Mornings are the most reliable time of day to fly this route — 88% on time.
- Mornings88% on time · p90 15 min · 1,096 flights
- Middays84% on time · p90 25 min · 513 flights
- Afternoons77% on time · p90 35 min · 261 flights
- Evenings73% on time · p90 35 min · 941 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 79% to 83% on time.
- Saturdays83% on time · p90 25 min · 318 flights
- Wednesdays82% on time · p90 25 min · 415 flights
- Tuesdays82% on time · p90 25 min · 415 flights
- Fridays82% on time · p90 30 min · 418 flights
- Thursdays81% on time · p90 25 min · 419 flights
- Mondays79% on time · p90 25 min · 415 flights
- Sundays79% on time · p90 30 min · 433 flights
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