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Route Reliability

Louisville → Washington

SDF–IAD · 451 miles · Louisville Muhammad Ali International Airport to Washington Dulles International Airport

90
Nerd Approved
WanderNerd Reliability Score
87%
Arrive within 15 minutes
3 min
Average arrival delay
0.9%
Cancelled
914
Flights in the data

Data through May 2026.

United Airlines is the only airline in this data on this route, arriving on time 87% of the time across 914 flights. No comparison to make.

What the data says

Morning flights do better here.

SDF–IAD flights departing between 3–6 AM arrived on time 100% of the time, versus 82% between 12–3 PM.

Sunday scaries are real for this one.

SDF–IAD flights arrived on time 93% of the time on Saturdays. On Sundays: 82%.

Ticking up lately.

SDF–IAD flights arrived on time 89% of the time over the last three months in the data, compared with 83% in the three months before that.

Best historical flights

Ranked by on-time arrivals, minimum 100 flights. Past performance, not a promise.

Top flights by on-time rate

More flights on this route

The breakdown

On-time by weekday
  • Mon84%(131 flights)
  • Tue87%(130 flights)
  • Wed85%(130 flights)
  • Thu91%(128 flights)
  • Fri87%(132 flights)
  • Sat93%(121 flights)
  • Sun82%(132 flights)
On-time by departure window
  • 3–6 AM100%(20 flights)
  • 6–9 AM89%(89 flights)
  • 9 AM–12 PM91%(360 flights)
  • 12–3 PM82%(435 flights)
On-time trend by month
91%
May

Jun 80% → May 91% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202580%85
July 202584%119
August 202590%108
September 202595%83
October 202586%62
November 202588%59
December 202574%62
January 202685%59
February 202691%53
March 202687%61
April 202690%60
May 202691%93

Same trip, other airports

Keep nerding

Based on 914 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.