Route reliability record

DCA→ATL

Washington to Atlanta

Flights: 6,819
Period: June 2025 to May 2026
Distance: 547 mi
Carriers: 6

This route carries a cancellation problem, not just a delay problem: 3.5% of scheduled flights never operate, against 1.8% nationally. Of the ones that do fly, close to three flights in four arrive on time, worth a B− overall. The punctuality figure counts only flights that actually departed, so it flatters an operation that cancels this often. That rests on 6,819 flights, of which Republic Airways flew 491 at 81.2% on time.

Republic Airways is the most reliable of the four carriers covered here at 81.2% on time across 491 flights.

On time

77.8%

Arrivals under 15 minutes late, of 6,565 completed flights

Avg delay

80 min

Across delayed arrivals only, not all flights

Cancelled

3.49%

National rate is 1.80%

Best carrier

Republic

81.2% on time across 491 flights

These figures cover 6,819 flights between June 2025 and May 2026. Beyond the headline rate, 8.9% 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

Which airline is most reliable on DCA to ATL

The choice of carrier is not cosmetic here. Republic Airways arrives on time 81.2% of the time; PSA Airlines manages 68.5%. Sample sizes sit next to every figure, because a two-point gap across 1,005 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
Republic Airways	491	81.2%	53 min	4.68%	B−
Delta Air Lines	3,830	80.1%	88 min	2.87%	B
Envoy Airthin sample	251	78.8%	59 min	2.39%	B
Southwest Airlines	1,169	77.2%	65 min	1.71%	B
PSA Airlines	1,005	68.5%	84 min	7.56%	C−
American Airlinesthin sample	73	68.1%	109 min	4.11%	C−

PSA Airlines cancels 7.6% 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.

Departure window

The best time of day to leave

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 28 points, against 13 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am1,308 flights90.5%
8am–11am1,513 flights84.8%
11am–2pm1,283 flights80.7%
2pm–5pm898 flights70.1%
5pm–8pm1,182 flights62.4%
8pm–5am635 flights68.1%

Scale runs 55% to 95%. Rows with fewer than 30 flights show a dash.

The 5pm–8pm window is where this operation falls apart: 62.4% on time, against 90.5% for the 5am–8am slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in.

Across the year

When delays peak on this route

This route's year swings by 18 points from best month to worst, which is wide. An annual average tells you very little about the week you are actually flying, so read the strip rather than the headline if your dates are fixed.

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

July is the worst month at 66.7% on time, 18 points below September, the best at 85.0%. 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.

Across the week, Saturday is the strongest day at 85.4% on time and Sunday the weakest at 74.7%. 11 points is a smaller lever than departure hour, but it is free.

Delay causes

Why this route gets delayed

One category carries most of the weight here. Late-arriving aircraft accounts for 46% of the 117,000 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Late-arriving aircraft
46%
Carrier
32%
National Airspace System
17%
Extreme weather
5%
Security
0%

46% 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 117,000 reported delay minutes here, that single category outweighs weather by 10 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 practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 90.5% on time here.

Cancellations run at 3.49%, against 1.80% nationally. That is about one flight in 30 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 actually costs

8.9% of arrivals land an hour or more late, close to the national 8.2%. 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 are the a little over an hour kind, 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 69.1% on time across 6,817 flights, 9 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 9 points of difference.

The sample behind these figures is 6,819 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 this route

Put together: the delay figures matter less here than the 3.49% cancellation rate. A late arrival costs you a little over an hour; 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.

Common questions

DCA to ATL questions

How often is DCA to ATL delayed?

Roughly one flight in five arrive at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 22.2% of the 6,819 flights in this analysis, against 22.6% nationally. Delayed flights are late by a little over an hour on average.

Which airline is most reliable on DCA to ATL?

Republic Airways leads at 81.2% on time across 491 flights. PSA Airlines is at the other end on 68.5%, a gap of 13 points. Sample size matters as much as the percentage: a rate built from a few hundred flights moves around far more than one built from ten thousand.

What time of day has the fewest delays on DCA to ATL?

The 5am–8am departure window is the strongest at 90.5% on time. The 5pm–8pm window is the weakest at 62.4%, 28 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.

How bad are July delays on DCA to ATL?

July is the weakest month at 66.7% on time, compared with 85.0% in September. Across the year that is 18 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.

Where to go next

Direction matters. DCA to ATL and ATL to DCA are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.

Source: US DOT Bureau of Transportation Statistics, on-time performance data, June 2025 to May 2026. Updated monthly. How this data is collected.

Key figures