Route reliability record
DCA→ORD
Washington to Chicago
- Flights
- 6,922
- Period
- June 2025 to May 2026
- Distance
- 612 mi
- Carriers
- 5
This route carries a cancellation problem, not just a delay problem: 3.4% 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 C− overall. The punctuality figure counts only flights that actually departed, so it flatters an operation that cancels this often. That rests on 6,922 flights, of which Republic Airways flew 995 at 75.1% on time.
Republic Airways is the most reliable of the three carriers covered here at 75.1% on time across 995 flights.
Key figures
On time
74.2%
Arrivals under 15 minutes late, of 6,666 completed flights
Avg delay
84 min
Across delayed arrivals only, not all flights
Cancelled
3.37%
National rate is 1.80%
Best carrier
Republic
75.1% on time across 995 flights
These figures cover 6,922 flights between June 2025 and May 2026. Beyond the headline rate, 10.5% 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 ORD
The three carriers here are closely matched: 2 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 | 80.9% | 81 min | 4.68% | B− |
| Republic Airways | 995 | 75.1% | 77 min | 5.73% | B− |
| American Airlines | 2,322 | 75.0% | 86 min | 4.05% | B− |
| SkyWest Airlinesthin sample | 49 | 73.9% | 66 min | 6.12% | C− |
| United Airlines | 3,385 | 73.2% | 86 min | 2.10% | C |
Republic Airways cancels 5.7% 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 34 points, against 2 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am1,261 flights87.7%
- 8am–11am1,164 flights85.2%
- 11am–2pm1,258 flights80.3%
- 2pm–5pm1,151 flights72.5%
- 5pm–8pm1,419 flights53.4%
- 8pm–5am669 flights64.3%
Scale runs 45% to 95%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 53.4% on time, against 87.7% 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
Twelve months, one bar each, drawn from the same 6,922 flights. The strip shows how much of this route's record is set by the calendar rather than by the operation.
July is the worst month at 65.3% on time, 12 points below February, the best at 77.2%. 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 79.1% on time and Friday the weakest at 70.5%. 9 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 145,000 reported delay minutes.
- 41%Late-arriving aircraft
- 34%National Airspace System
- 16%Carrier
- 9%Extreme weather
- 0%Security
41% 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 145,000 reported delay minutes here, that single category outweighs weather by 5 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.
34% 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 49,000 minutes out of 145,000, against a national NAS share of 21%.
Cancellations run at 3.37%, 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
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 10.5% 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 68.5% on time across 6,918 flights, 6 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 6 points of difference.
The sample behind these figures is 6,922 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 3.37% 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.
Common questions
DCA to ORD questions
How often is DCA to ORD delayed?
About one flight in four arrive at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 25.8% of the 6,922 flights in this analysis, against 22.6% nationally. Delayed flights are late by an hour and a half on average.
Which airline is most reliable on DCA to ORD?
Republic Airways leads at 75.1% on time across 995 flights. United Airlines is at the other end on 73.2%, a gap of 2 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 ORD?
The 5am–8am departure window is the strongest at 87.7% on time. The 5pm–8pm window is the weakest at 53.4%, 34 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 ORD?
July is the weakest month at 65.3% on time, compared with 77.2% in February. Across the year that is 12 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
- ORD to DCA — the return legseparate record
- Ronald Reagan Washington National (DCA) delay statistics
- Chicago O'Hare International (ORD) delay statistics
- Envoy Air on-time record80.9%
- Republic Airways on-time record75.1%
- American Airlines on-time record75.0%
- 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. DCA to ORD and ORD 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.