Carrier route record

DLDCA→ATL

Delta Air Lines · Washington to Atlanta

Flights: 3,838
Period: July 2025 to June 2026
Share of route: 56%
Carriers: 6

Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with Delta Air Lines.

Delta on DCA to ATL lands a B, 3 points better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That is a workable record, not a spotless one. That rests on 3,838 flights. The strongest carrier on the route with a full sample, Republic Airways, flew 461 at 81.3% on time.

Republic Airways is the most reliable of the three carriers covered here at 81.3% on time across 461 flights.

On time

80.9%

Arrivals under 15 minutes late, of 3,720 completed flights

Avg delay

88 min

Across delayed arrivals only, not all flights

Cancelled

2.81%

National rate is 1.81%

Whole route

78.8%

Every carrier on DCA to ATL, 6,813 flights

These figures cover 3,838 flights between July 2025 and June 2026. Beyond the headline rate, 8.0% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Carrier by carrier

Delta against every carrier on DCA to ATL

Delta flew 3,838 of the 6,813 flights on DCA to ATL, most of the route. Its 80.9% on time is 2 points better than the route as a whole, which runs 78.8%. Ranked by on-time rate it is number three of six carriers on the route, where the range runs from Envoy at 82.4% to American at 67.8%. Two of those carriers flew fewer than 365 flights here, so treat their positions as rough.

The choice of carrier is not cosmetic here. Republic Airways arrives on time 81.3% of the time; PSA Airlines manages 68.8%. Sample sizes sit next to every figure, because a two-point gap across 1,055 flights means less than a ten-point one.

On-time performance by carrier on DCA to ATL
Airline	Flights	On time	Avg delay	Cancelled	Grade
Envoy Airthin sample	259	82.4%	67 min	1.54%	B
Republic Airways	461	81.3%	52 min	3.69%	B−
Delta Air Lines (this page)	3,838	80.9%	88 min	2.81%	B
Southwest Airlines	1,139	79.1%	62 min	2.11%	B
PSA Airlines	1,055	68.8%	81 min	8.25%	C−
American Airlinesthin sample	61	67.8%	102 min	1.64%	C

PSA Airlines cancels 8.3% of what it schedules here, the highest in the table. A cancelled flight never appears in an on-time rate, so read that column alongside the punctuality one rather than after it.

Flight by flight

Delta flight numbers on DCA to ATL

Departure window

When Delta runs best on this route

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 24 points, against 13 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am710 flights93.2%
8am–11am1,050 flights85.8%
11am–2pm709 flights79.5%
2pm–5pm382 flights72.8%
5pm–8pm679 flights69.3%
8pm–5am308 flights74.0%

Scale runs 60% to 100%. Rows with fewer than 30 flights show a dash.

Book the early departure. Flights leaving between 5am–8am arrive on time 93.2% of the time, against 69.3% for the evening window. That is 24 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 8am–11am window is the busiest, with 1,050 flights scheduled in it.

Across the year

Delta on DCA to ATL through the year

Darker means more delays. Figures are on-time percentages.September best, July worst

July is the worst month at 66.6% on time, 21 points below September, the best at 87.1%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. March was the busiest month here, with 329 flights.

Across the week, Saturday is the strongest day at 85.6% on time and Monday the weakest at 77.6%. 8 points is a smaller lever than departure hour, but it is free.

Delay causes

Why Delta runs late on this route

Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 62,000 reported delay minutes.

Late-arriving aircraft
42%
Carrier
38%
National Airspace System
17%
Extreme weather
4%

42% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 62,000 reported delay minutes here, that single category outweighs weather by 12 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 62,421 reported delay minutes.

The largest share of delay minutes, 38%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 23,000 of the 62,000 delay minutes reported here.

Cancellations run at 2.81%, against 1.81% nationally. That is roughly one flight in 40 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.

Connections and stage length

What a delay here costs

8.0% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last an hour and a half, which a normal layover absorbs.

The 547 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

The return leg is a different operation and performs like one: it runs 67.3% on time across 3,838 flights, 14 points below this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 14 points of difference.

The sample behind these figures is 3,838 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.

What to do with this

Booking Delta on DCA to ATL

Put together: the delay figures matter less here than the 2.81% cancellation rate. A late arrival costs you an hour and a half; a cancelled flight costs you the day. Book the 5am–8am departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 3,720 completed flights over 12 months sit behind that.

Where to go next

Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures