Carrier route record
UADCA→ORD
United Airlines · Washington to Chicago
- Flights
- 3,392
- Period
- July 2025 to June 2026
- Share of route
- 49%
- Carriers
- 5
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with United Airlines.
United on DCA to ORD sits in the middle of the pack with a C. Close to three flights in four arrive on time by the DOT's definition, 4 points worse than the national rate of 77.6%. The late ones land an hour and a half behind schedule. That rests on 3,392 flights. The strongest carrier on the route with a full sample, Republic Airways, flew 1,059 at 75.3% on time.
The national on-time rate over the same period is 77.6%, so United on DCA to ORD runs 4 points behind the country as a whole. Across a thousand flights that is about 40 extra late arrivals.
Key figures
On time
73.6%
Arrivals under 15 minutes late, of 3,306 completed flights
Avg delay
89 min
Across delayed arrivals only, not all flights
Cancelled
2.21%
National rate is 1.81%
Whole route
74.3%
Every carrier on DCA to ORD, 6,992 flights
These figures cover 3,392 flights between July 2025 and June 2026. Beyond the headline rate, 10.6% 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
United against every carrier on DCA to ORD
United flew 3,392 of the 6,992 flights on DCA to ORD, about 49% of it. Its 73.6% on time is about level with the route as a whole at 74.3%. Ranked by on-time rate it is number four of five carriers on the route, where the range runs from Envoy at 80.9% to SkyWest at 66.2%. Two of those carriers flew fewer than 365 flights here, so treat their positions as rough.
The two carriers here are closely matched: half a point 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 | 80.9% | 81 min | 4.68% | B− |
| Republic Airways | 1,059 | 75.3% | 76 min | 5.57% | B− |
| American Airlines | 2,301 | 74.7% | 91 min | 4.00% | C− |
| United Airlines (this page) | 3,392 | 73.6% | 89 min | 2.21% | C |
| SkyWest Airlinesthin sample | 69 | 66.2% | 97 min | 5.80% | C− |
Republic Airways cancels 5.6% 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.
Flight by flight
United flight numbers on DCA to ORD
Departure window
When United runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 42 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am637 flights88.7%
- 8am–11am657 flights89.4%
- 11am–2pm636 flights82.6%
- 2pm–5pm471 flights70.0%
- 5pm–8pm858 flights47.8%
- 8pm–5am133 flights57.7%
Scale runs 40% to 95%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 47.8% on time, against 89.4% for the 8am–11am 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. The 5pm–8pm window is the busiest, with 858 flights scheduled in it.
Across the year
United on DCA to ORD through the year
July is the worst month at 62.2% on time, 17 points below February, the best at 79.6%. 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. July was the busiest month here, with 348 flights.
Across the week, Saturday is the strongest day at 78.4% on time and Wednesday the weakest at 69.5%. 9 points is a smaller lever than departure hour, but it is free.
Delay causes
Why United 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 78,000 reported delay minutes.
- 42%National Airspace System
- 36%Late-arriving aircraft
- 13%Carrier
- 9%Extreme weather
36% 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 78,000 reported delay minutes here, that single category outweighs weather by 4 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 77,539 reported delay minutes.
42% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 32,000 minutes out of 78,000, against a national NAS share of 21%.
Cancellations sit at 2.21% against a national 1.81%, which is ordinary. Diversions add another 0.32%.
Connections and stage length
What a delay here costs
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 10.6% of arrivals land a full hour or more behind schedule, against 8.1% 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 70.6% on time across 3,393 flights, 3 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 3 points of difference.
The sample behind these figures is 3,392 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 United on DCA to ORD
Put together: the calendar is the biggest lever here, not the carrier or the hour. February runs 79.6% on time and July 62.2%, a swing of 17 points. If the dates move at all, move them out of July before you think about anything else. 3,306 completed flights over 12 months sit behind that.
Related
Where to go next
- DCA to ORD, every carrier
- United on ORD to DCA, the return leg
- Envoy Air on DCA to ORD80.9%
- Republic Airways on DCA to ORD75.3%
- American Airlines on DCA to ORD74.7%
- United Airlines network-wide record
- Ronald Reagan Washington National (DCA) delay statistics
- Chicago O'Hare International (ORD) delay statistics
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.04 million flight records
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.