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Route on-time record

GRR to MDW: most on-time flights and the best time to fly

Grand Rapids (Gerald R. Ford International Airport) to Chicago (Chicago Midway International Airport). 928 nonstop flights in Jun 2025 to May 2026, 78% arrived within 15 minutes and 0.4% were cancelled. The most reliable flight number was Southwest 4375 at 12:30 PM.

Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.

GRR → MDW

Grand Rapids to Chicago: 928 nonstop flights a year

On time (12 months)

78%

Cancelled

0.4%

avg delay 12 min

Best time to leave

Before 9 AM

84% on time vs 62% 6 to 9 PM

Most reliable airline

Southwest

77% chance on time

Check GRR to MDW fares

Fares open on our travel partner (Aviasales). Pick the flight number you chose here.

Most reliable nonstop flights

Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.

  1. #1 · Southwest 4375

    12:30 PM → 12:30 PM1h 00m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    88%

    chance on time

    On time (history)
    96%
    Cancelled
    0.0%
    Avg arrival delay
    3 min
    • Arrived on time 96% of the time (46 flights, Jun 2025 to May 2026).
    • Never cancelled in 46 scheduled flights.
    • Lands inside MDW's trouble window: 50% of its 30 ground stops and delay programs started between 7 AM and 1 PM.
    • Short track record (46 flights), so its score leans on the airline's record at this hour.

    Limited track record · 46 flights

    Find Southwest 4375 fares Opens this date on Aviasales

  2. #2 · Southwest 2237

    6:30 AM → 6:35 AM1h 00m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 3238; its record covers all of them.

    82%

    chance on time

    On time (history)
    85%
    Cancelled
    2.3%
    Avg arrival delay
    6 min
    • Arrived on time 85% of the time (85 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 84% on time; 6 to 9 PM: 62%).

    Moderate track record · 85 flights

    Find Southwest 2237 fares Opens this date on Aviasales

  3. #3 · Southwest 4400

    12:40 PM → 12:45 PM1h 05m nonstop

    Local times, typical schedule. Last flown 2026-04-06.

    78%

    chance on time

    On time (history)
    75%
    Cancelled
    0.0%
    Avg arrival delay
    24 min
    • Arrived on time 75% of the time (28 flights, Jun 2025 to May 2026).
    • Lands inside MDW's trouble window: 50% of its 30 ground stops and delay programs started between 7 AM and 1 PM.
    • 57% of its delay minutes came from the plane arriving late from an earlier flight.
    • Short track record (28 flights), so its score leans on the airline's record at this hour.

    Limited track record · 28 flights

    Find Southwest 4400 fares Opens this date on Aviasales

  4. #4 · Southwest 3017

    5:50 PM → 5:55 PM1h 05m nonstop

    Local times, typical schedule. Last flown 2026-04-06.

    73%

    chance on time

    On time (history)
    73%
    Cancelled
    0.0%
    Avg arrival delay
    14 min
    • Arrived on time 73% of the time (33 flights, Jun 2025 to May 2026).
    • Never cancelled in 33 scheduled flights.
    • 67% of its delay minutes came from the plane arriving late from an earlier flight.
    • Short track record (33 flights), so its score leans on the airline's record at this hour.

    Limited track record · 33 flights

    Find Southwest 3017 fares Opens this date on Aviasales

  5. #5 · Southwest 2194

    5:40 PM → 5:45 PM1h 05m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    71%

    chance on time

    On time (history)
    72%
    Cancelled
    0.0%
    Avg arrival delay
    15 min
    • Arrived on time 72% of the time (54 flights, Jun 2025 to May 2026).
    • Never cancelled in 54 scheduled flights.
    • Short track record (54 flights), so its score leans on the airline's record at this hour.

    Limited track record · 54 flights

    Find Southwest 2194 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Southwest Airlines77%

    928 flights · 78% on time as flown · 0.4% cancel

On time by departure time

All airlines, scheduled local departure, Jun 2025 to May 2026.

  • Before 9 AM84%

    349 flights · avg delay 8 min

  • Noon to 3 PM83%

    196 flights · avg delay 11 min

  • 3 to 6 PM76%

    207 flights · avg delay 13 min

  • 6 to 9 PM62%

    160 flights · avg delay 21 min

Best day: Saturday (84%). Worst: Sunday (80%).

On time by month

All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.

J
74
F
82
M
83
A
87
M
88
J
83
J
73
A
81
S
82
O
87
N
84
D
78

What delays this route

  • Late-arriving aircraft39%
  • Air traffic control and airport volume34%
  • Airline (crew, maintenance, boarding)25%
  • Severe weather2%

Share of delay minutes by the cause airlines report to the US DOT.

Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure

GRR to MDW questions

What time of day is best to fly GRR to MDW?
Before 9 AM: 84% of flights arrived on time, against 62% for departures 6 to 9 PM. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
Which airline is most on time from GRR to MDW?
Southwest, with a season-adjusted 77% chance of operating and arriving on time over 928 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
What is the worst month for delays on GRR to MDW?
July (73% on time); the best was May (88%), averaged over Jun 2023 to May 2026.
Is this a prediction for my flight?
No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.

More routes from GRR

Live status: FAA delays and ground stops