Route reliability record
ORD→DCA
Chicago to Washington
- Flights
- 6,918
- Period
- June 2025 to May 2026
- Distance
- 612 mi
- Carriers
- 5
This route sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 9 points worse than the national rate of 77.4%. The late ones land a little over an hour behind schedule. That rests on 6,918 flights, of which United Airlines flew 3,386 at 70.6% on time.
United Airlines is the most reliable of the three carriers covered here at 70.6% on time across 3,386 flights.
Key figures
On time
68.5%
Arrivals under 15 minutes late, of 6,671 completed flights
Avg delay
82 min
Across delayed arrivals only, not all flights
Cancelled
2.99%
National rate is 1.80%
Best carrier
United
70.6% on time across 3,386 flights
These figures cover 6,918 flights between June 2025 and May 2026. Beyond the headline rate, 13.1% 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 ORD to DCA
The three carriers here are closely matched: 6 points separate the best from the worst. At that spread, schedule and price are better tie-breakers than reliability. Sample sizes are shown so you can see which rows are worth weighing.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Envoy Airthin sample | 171 | 83.5% | 47 min | 2.34% | B |
| United Airlines | 3,386 | 70.6% | 73 min | 1.68% | C |
| SkyWest Airlinesthin sample | 49 | 67.4% | 63 min | 6.12% | C− |
| Republic Airways | 991 | 67.3% | 73 min | 4.64% | C− |
| American Airlines | 2,321 | 64.9% | 97 min | 4.18% | D− |
Republic Airways cancels 4.6% 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 31 points, against 6 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am1,042 flights86.1%
- 8am–11am1,525 flights79.5%
- 11am–2pm1,386 flights63.5%
- 2pm–5pm1,163 flights62.2%
- 5pm–8pm1,293 flights54.7%
- 8pm–5am509 flights61.8%
Scale runs 45% to 90%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 54.7% on time, against 86.1% 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 16 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.
July is the worst month at 58.7% on time, 16 points below October, the best at 75.0%. 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 74.4% on time and Friday the weakest at 64.8%. 10 points is a smaller lever than departure hour, but it is free.
Delay causes
Why this route gets delayed
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 171,000 reported delay minutes.
- 42%Late-arriving aircraft
- 29%National Airspace System
- 23%Carrier
- 6%Extreme weather
- 0%Security
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 171,000 reported delay minutes here, that single category outweighs weather by 7 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 86.1% on time here.
Cancellations run at 2.99%, against 1.80% nationally. That is roughly 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
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 13.1% of arrivals land a full hour or more behind schedule, against 8.2% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.
The 612 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 74.2% on time across 6,922 flights, 6 points above 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 6 points of difference.
The sample behind these figures is 6,918 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 2.99% 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
ORD to DCA questions
How often is ORD to DCA delayed?
About one flight in three arrive at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 31.5% of the 6,918 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 ORD to DCA?
United Airlines leads at 70.6% on time across 3,386 flights. American Airlines is at the other end on 64.9%, a gap of 6 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 ORD to DCA?
The 5am–8am departure window is the strongest at 86.1% on time. The 5pm–8pm window is the weakest at 54.7%, 31 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 ORD to DCA?
July is the weakest month at 58.7% on time, compared with 75.0% in October. Across the year that is 16 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
- DCA to ORD — the return legseparate record
- Chicago O'Hare International (ORD) delay statistics
- Ronald Reagan Washington National (DCA) delay statistics
- Envoy Air on-time record83.5%
- United Airlines on-time record70.6%
- SkyWest Airlines on-time record67.4%
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.05 million flight records
Direction matters. ORD to DCA and DCA to ORD 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.