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Flight Reliability

DL 4140 · Delta Air Lines

GRB → Minneapolis (GRB–MSP)100% of its flights flew this route. The rest (GRR–DTW) are included in these numbers.

90
Nerd Approved
WanderNerd Reliability Score
92%
Arrive within 15 minutes
3 min early
Average arrival delay
2.4%
Cancelled
18 min early
Median arrival delay

Based on 205 historical flights. Data through May 2026.

What the data says

Tuesday comes out ahead.

A small edge: 93% on time on Tuesdays against 89% on Mondays.

Better than the GRB–MSP route average.

DL 4140 arrived on time 92% of the time, versus 81% across the GRB–MSP route.

Better than the Delta Air Lines network average.

DL 4140 arrived on time 92% of the time, versus 81% across the Delta Air Lines network.

Slipping a little lately.

DL 4140 arrived on time 90% of the time over the last three months in the data, compared with 96% in the three months before that.

The breakdown

On-time by weekday
  • Mon89%(28 flights)
  • Tue93%(30 flights)
  • Wed90%(30 flights)
  • Thu93%(29 flights)
  • Fri93%(28 flights)
  • Sat90%(29 flights)
  • Sun92%(26 flights)
On-time by departure window
  • 3–6 AM—(1 flights)
  • 6–9 AM92%(199 flights)
On-time trend by month
97%
May

Jun 96% → May 97% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202596%23
August 202591%21
September 2025100%10
January 202692%25
February 202696%26
March 202676%29
April 202696%28
May 202697%31
Departures on time
92%
Diverted
0%
Flights flown
200
Months covered
10

Same route, other flights

Keep nerding

Based on 205 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.