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Route Reliability

Washington → Atlanta

IAD–ATL · 534 miles · Washington Dulles International Airport to Hartsfield–Jackson Atlanta International Airport

77
Usually Fine
WanderNerd Reliability Score
79%
Arrive within 15 minutes
9 min
Average arrival delay
2.1%
Cancelled
4,043
Flights in the data

Data through May 2026.

Who flies it best

Ranked by on-time arrivals. Historical results, not predictions.

  1. 1.United Airlines82%1,219 flights
  2. 2.Delta Air Lines81%2,217 flights
  3. 3.Frontier Airlines69%607 flights

What the data says

The 9 AM–12 PM departure wins.

IAD–ATL flights departing between 9 AM–12 PM arrived on time 85% of the time, versus 62% between 3–6 AM.

Sunday scaries are real for this one.

IAD–ATL flights arrived on time 83% of the time on Thursdays. On Sundays: 75%.

United Airlines runs this route best.

United Airlines arrived on time 82% of the time on this route; Frontier Airlines managed 69%.

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
  • Mon76%(592 flights)
  • Tue83%(523 flights)
  • Wed80%(531 flights)
  • Thu83%(609 flights)
  • Fri76%(610 flights)
  • Sat83%(477 flights)
  • Sun75%(600 flights)
On-time by departure window
  • 3–6 AM62%(37 flights)
  • 6–9 AM84%(1205 flights)
  • 9 AM–12 PM85%(422 flights)
  • 12–3 PM83%(750 flights)
  • 3–6 PM71%(1030 flights)
  • 6–9 PM72%(289 flights)
  • 9 PM–12 AM79%(209 flights)
On-time trend by month
76%
May

Jun 68% → May 76% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202568%345
July 202569%334
August 202579%344
September 202589%333
October 202583%359
November 202580%330
December 202574%325
January 202683%269
February 202686%256
March 202679%298
April 202688%350
May 202676%399

Same trip, other airports

Keep nerding

Based on 4,043 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.