Route reliability record
SNA→ORD
Santa Ana to Chicago
- Flights
- 2,164
- Period
- September 2025 to August 2026
- Distance
- 1,726 mi
- Carriers
- 2
This route lands a B, level with the national rate of 77.3%. About one flight in four arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That rests on 2,164 SNA to ORD flights, of which United Airlines flew 1,041 at 77.4% on time.
Best time to fly SNA to ORD: a 5am–8am departure, ideally on a Tuesday. Flights in that window arrived on time 88.3% of the time and Tuesday flights 83.2%, against 76.8% 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
76.8%
Arrivals under 15 minutes late, of 2,104 completed flights
Avg delay
76 min
Across delayed arrivals only, not all flights
Cancelled
1.06%
National rate is 1.89%
Best carrier
United
77.4% on time across 1,041 flights
These figures cover 2,164 flights between September 2025 and August 2026. Beyond the headline rate, 8.4% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Carrier by carrier
Which airline is most reliable on SNA to ORD
The two carriers here are closely matched: about 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 |
|---|---|---|---|---|---|
| United Airlines | 1,041 | 77.4% | 65 min | 0.38% | B+ |
| American Airlines | 1,123 | 76.1% | 86 min | 1.69% | B |
No carrier stands out. United tops the table at 77.4%, about a point clear of the bottom, which is inside the range this kind of sample moves year to year.
Flight by flight
Flights on SNA 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.
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Best ways to make this trip
The most reliable ways to fly Santa Ana to Chicago
Every airline on this route and on the routes between nearby airports, ranked by how often a scheduled flight actually operated and arrived on time. 3 of the top 5 use a different airport at one end.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. LAX → ORDLos Angeles to Chicago | United Airlines | 79.3% | 79.9% | 0.70% | 5am–8am, Tue | UA 1941 07:00 |
| 2. SNA → ORDSanta Ana to Chicago | United Airlines | 77.1% | 77.4% | 0.38% | 5am–8am, Tue | — |
| 3. LAX → MDWLos Angeles to Chicago | Southwest Airlines | 76.3% | 76.7% | 0.55% | 5am–8am, Sat | — |
| 4. SNA → ORDSanta Ana to Chicago | American Airlines | 74.8% | 76.1% | 1.69% | 5am–8am, Tue | AA 2590 07:45 |
| 5. LAX → ORDLos Angeles to Chicago | American Airlines | 72.6% | 73.9% | 1.78% | 5am–8am, Tue | — |
Success is the share of scheduled flights that operated and arrived less than 15 minutes late, so a cancelled flight counts against it. “(route)” means the best time comes from every carrier on the route rather than this airline alone.
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 22 points, against about a point between the best and worst carrier.
- 5am–8am535 flights88.3%
- 8am–11am453 flights81.9%
- 11am–2pm520 flights73.2%
- 2pm–5pm656 flights66.6%
- 5pm–8pm—
- 8pm–5am—
Scale runs 60% to 95%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 88.3% of the time, against 66.6% for the afternoon window. That is 22 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 2pm–5pm window is the busiest, with 656 flights scheduled in it.
Explore
Filter SNA 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 SNA to ORD, the best departure window is 5am–8am at 88.3% on time and the worst is 2pm–5pm at 66.6%, a wide gap of 21.7 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am88.3%
- 8–11am81.9%
- 11am–2pm73.2%
- 2–5pm66.6%
- 5–8pm—
- 8pm–5am—
best all US flightsScale 60% to 95%. Cells under 30 flights show a dash.
Across the year
When delays peak on this route
Twelve months, one bar each, drawn from the same 2,164 flights. The strip shows how much of this route's record is set by the calendar rather than by the operation.
Delays peak in March, when the on-time rate falls to 70.8%. December is the strongest month at 82.2%. Moving a flexible trip across that boundary buys 11 points. October was the busiest month here, with 208 flights.
Across the week, Tuesday is the strongest day at 83.2% on time and Sunday the weakest at 65.0%, a spread of 18 points.
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 37,000 reported delay minutes.
- 40%National Airspace System
- 34%Late-arriving aircraft
- 22%Carrier
- 5%Extreme weather
40% 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 15,000 minutes out of 37,000, against a national NAS share of 21%. The split is drawn from 37,328 reported delay minutes.
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 88.3% on time here.
Cancellations sit at 1.06% against a national 1.89%, which is ordinary. Diversions add another 1.71%.
Connections and stage length
What a delay here actually costs
8.4% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last a little over an hour, which a normal layover absorbs.
At 1,726 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
The return leg runs 74.7% on time across 2,164 flights, within 2 points of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
The sample behind these figures is 2,164 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: take the 5am–8am departure, avoid March if the dates are flexible, and if two carriers are within a few dollars of each other, United is the one with the record behind it. None of that guarantees an on-time arrival; it moves the odds by 22 points, which is the most any booking decision can do. 2,104 completed flights over 12 months sit behind that.
Common questions
SNA to ORD questions
How often is SNA 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 23.2% of the 2,164 flights in this analysis, against 22.7% nationally. Delayed flights are late by a little over an hour on average.
Which airline is most reliable on SNA to ORD?
United Airlines leads at 77.4% on time across 1,041 flights. American Airlines is at the other end on 76.1%, a gap of about a point. 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 SNA to ORD?
The 5am–8am departure window is the strongest at 88.3% on time. The 2pm–5pm window is the weakest at 66.6%, 22 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 SNA to ORD?
March is the weakest month at 70.8% on time, compared with 82.2% in December. Across the year that is 11 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 SNA — the return legseparate record
- John Wayne Airport (SNA) delay statistics
- Chicago O'Hare International (ORD) delay statistics
- United Airlines on SNA to ORD77.4%
- American Airlines on SNA to ORD76.1%
- SNA to SFO, a related route65.5%
- LGA to ORD, a related route66.7%
- SNA to PHX, a related route82.3%
- United Airlines on-time record77.4%
- American Airlines on-time record76.1%
- 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. SNA to ORD and ORD to SNA are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
Embed SNA to ORD’s on-time badge on your site
Paste this into a web page. The badge shows the current on-time rate, cancellation rate and grade, and updates every month. Preview it, or build a badge for another route or airport.
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.