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Flight Reliability

DL 1637 · Delta Air Lines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and DL 1637 moved between routes during this period. Numbers below combine all of them, so treat them as background, not a verdict. For a cleaner answer, check the route you are actually flying.

Combined across all its routes

88%
Arrive within 15 minutes
3 min early
Average arrival delay
1.0%
Cancelled
11 min early
Median arrival delay

Based on 728 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon83%(102 flights)
  • Tue81%(102 flights)
  • Wed92%(104 flights)
  • Thu92%(104 flights)
  • Fri96%(103 flights)
  • Sat81%(102 flights)
  • Sun85%(102 flights)
On-time by departure window
  • 6–9 AM94%(72 flights)
  • 9 AM–12 PM88%(569 flights)
  • 12–3 PM78%(78 flights)
On-time trend by month
92%
May

Jun 73% → May 92% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202573%60
July 202592%62
August 202595%62
September 202595%60
October 202592%62
November 202580%59
December 202584%62
January 202691%55
February 202691%56
March 202681%59
April 202683%60
May 202692%62
Departures on time
86%
Diverted
0.3%
Flights flown
719
Months covered
12

Keep nerding

Based on 728 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.