Route reliability record
OKC→ORD
Oklahoma City to Chicago
- Flights
- 2,622
- Period
- September 2025 to August 2026
- Distance
- 693 mi
- Carriers
- 4
This route sits in the middle of the pack with a B−. Close to three flights in four arrive on time by the DOT's definition, 2 points worse than the national rate of 77.3%. The late ones land an hour and a half behind schedule. That rests on 2,622 OKC to ORD flights, with a median arrival 6 minutes early.
Best time to fly OKC to ORD: a 5am–8am departure, ideally on a Thursday. Flights in that window arrived on time 84.2% of the time and Thursday flights 82.0%, against 75.2% for the route overall.
The US average over the same twelve months is 77.3%, so there is little to separate this route from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
75.2%
Arrivals under 15 minutes late, of 2,529 completed flights
Avg delay
94 min
Across delayed arrivals only, not all flights
Cancelled
3.05%
National rate is 1.89%
Best carrier
SkyWest
73.8% on time across 2,340 flights
These figures cover 2,622 flights between September 2025 and August 2026. Beyond the headline rate, 11.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
Which airline is most reliable on OKC to ORD
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Envoy Airthin sample | 26 | 88.0% | 41 min | 3.85% | A− |
| Republic Airwaysthin sample | 211 | 87.9% | 66 min | 1.42% | A |
| United Airlinesthin sample | 45 | 81.8% | 133 min | 2.22% | B |
| SkyWest Airlines | 2,340 | 73.8% | 95 min | 3.21% | C− |
Flight by flight
Flights on OKC to ORD
The flight numbers below flew this route at least 250 times in the period, busiest first. Each has its own record, with its schedule and delay causes.
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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 25 points, against half a point between the best and worst carrier.
- 5am–8am590 flights84.2%
- 8am–11am574 flights80.8%
- 11am–2pm665 flights72.1%
- 2pm–5pm279 flights80.4%
- 5pm–8pm514 flights59.3%
- 8pm–5am—
Scale runs 50% to 90%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 59.3% on time, against 84.2% 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. The 11am–2pm window is the busiest, with 665 flights scheduled in it.
Explore
Filter OKC to ORD by airline, time, month and day
Pick a breakdown and a carrier. The dashed mark on each row is the same slice for every US flight.
On OKC to ORD, the best departure window is 5am–8am at 84.2% on time and the worst is 5pm–8pm at 59.3%, a wide gap of 24.9 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am84.2%
- 8–11am80.8%
- 11am–2pm72.1%
- 2–5pm80.4%
- 5–8pm59.3%
- 8pm–5am—
best all US flightsScale 50% to 95%. Cells under 30 flights show a dash.
Across the year
When delays peak on this route
This route's year swings by 14 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.
May is the best month on the calendar at 81.9% on time. Shoulder season thins the schedule and takes the summer weather with it, and the operation gets its margin back. July was the busiest month here, with 248 flights.
Across the week, Thursday is the strongest day at 82.0% on time and Sunday the weakest at 66.8%, a spread of 15 points.
Delay causes
Why this route gets delayed
Carrier accounts for 47% of the 59,000 delay minutes carriers reported here, and the remaining four split what is left.
- 47%Carrier
- 27%National Airspace System
- 19%Late-arriving aircraft
- 7%Extreme weather
The largest share of delay minutes, 47%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 27,000 of the 59,000 delay minutes reported here. The split is drawn from 58,897 reported delay minutes.
Cancellations run at 3.05%, against 1.89% 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
11.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
The 693 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.
The return leg is a different operation and performs like one: it runs 69.5% on time across 2,623 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 2,622 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.
Work out the risk of missing a connection in ORD after this flight
What to do with this
Booking this route
Put together: the delay figures matter less here than the 3.05% 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. 2,529 completed flights over 12 months sit behind that.
Common questions
OKC to ORD questions
How often is OKC to ORD delayed?
About one flight in four arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 24.8% of the 2,622 flights in this analysis, against 22.7% nationally. Delayed flights are late by an hour and a half on average.
How reliable is OKC to ORD compared with the rest of the country?
75.2% of flights arrive on time here against a national 77.3%, a difference of 2 points against it. That is worth a B− on this site's grading scale.
What time of day has the fewest delays on OKC to ORD?
The 5am–8am departure window is the strongest at 84.2% on time. The 5pm–8pm window is the weakest at 59.3%, 25 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 March delays on OKC to ORD?
March is the weakest month at 68.2% on time, compared with 81.9% in May. Across the year that is 14 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 OKC — the return legseparate record
- Chicago O'Hare International (ORD) delay statistics
- Republic Airways on OKC to ORD87.9%
- SkyWest Airlines on OKC to ORD73.8%
- OKC to DFW, a related route79.3%
- LGA to ORD, a related route66.7%
- OKC to DEN, a related route80.5%
- Envoy Air on-time record88.0%
- Republic Airways on-time record87.9%
- United Airlines on-time record81.8%
- The US routes with the most cancellations
- What a cancellation rate actually tells you (and what it hides)
Direction matters. OKC to ORD and ORD to OKC are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
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Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.