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Flight Reliability

DL 343 · Delta Air Lines

Washington → Atlanta (DCA–ATL)95% of its flights flew this route. The rest (IAH–LGA, BOS–RDU) are included in these numbers.

79
Usually Fine
WanderNerd Reliability Score
85%
Arrive within 15 minutes
5 min
Average arrival delay
3.5%
Cancelled
12 min early
Median arrival delay

Based on 347 historical flights. Data through May 2026.

What the data says

Morning-you made the right choice.

DL 343 departing between 6–9 AM arrived on time 86% of the time, versus 73% between 12–3 PM.

Mondays have been rough.

DL 343 arrived on time 94% of the time on Wednesdays and just 73% on Mondays. That gap is worth planning around.

Better than the DCA–ATL route average.

DL 343 arrived on time 85% of the time, versus 78% across the DCA–ATL route.

A bit ahead of the Delta Air Lines network.

DL 343 arrived on time 85% of the time, versus 81% across the Delta Air Lines network.

The breakdown

On-time by weekday
  • Mon73%(48 flights)
  • Tue86%(51 flights)
  • Wed94%(35 flights)
  • Thu94%(52 flights)
  • Fri86%(49 flights)
  • Sat80%(49 flights)
  • Sun86%(51 flights)
On-time by departure window
  • 6–9 AM86%(323 flights)
  • 12–3 PM73%(11 flights)
  • 3–6 PM—(1 flights)
On-time trend by month
83%
May

Jun 72% → May 83% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202572%29
July 202582%28
August 202589%28
September 2025100%28
October 202590%31
November 202590%29
December 202577%30
January 202677%26
February 202692%25
March 202682%27
April 202692%24
May 202683%30
Departures on time
86%
Diverted
0%
Flights flown
335
Months covered
12

Same route, other flights

Keep nerding

Based on 347 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.