Route Reliability — How a Pairing Has Actually Run
Two airports, one question: how often did flights between them land on time, and with which airline? The 1,000 busiest domestic pairings are on the board, airline by airline, over the three years through June 2026. These are historical odds, not forecasts. The records say what happened on this schedule over three years; they know nothing about tomorrow’s thunderstorm.
Data through June 2026 · Bureau of Transportation Statistics
That pairing isn't in the 1,000 busiest domestic routes, so there is no honest rate to show for it. Both airports have their own page: ORD and DEN .
Something didn't load just now. The route index has every tracked pairing, and each one has a page that works without this tool.
| Airline | Flights | Arrived on time | Average delay when late | Cancelled |
|---|
Busiest pairings on the board
| Pairing | Flights | Arrived on time | Most flights flown by |
|---|---|---|---|
| LAX → SFO | 33,701 | 70.1% | United Airlines |
| SFO → LAX | 33,688 | 77.6% | United Airlines |
| OGG → HNL | 33,585 | 87.1% | Hawaiian Airlines |
| HNL → OGG | 33,576 | 88.1% | Hawaiian Airlines |
| LGA → ORD | 32,930 | 75.2% | United Airlines |
| ORD → LGA | 32,929 | 73.7% | United Airlines |
| LAX → JFK | 30,234 | 80.1% | JetBlue Airways |
| JFK → LAX | 30,232 | 80% | JetBlue Airways |
| DCA → BOS | 27,810 | 76.3% | Republic Airways |
| BOS → DCA | 27,809 | 77.5% | Republic Airways |
| PHX → DEN | 27,770 | 79% | Southwest Airlines |
| DEN → PHX | 27,686 | 76.1% | Southwest Airlines |
What the numbers cover
A flight counts as on time when it arrives less than 15 minutes behind its scheduled time, which is the federal definition. Cancelled and diverted flights never arrived, so they sit out of the on-time share and are reported on their own line. An airline appears in the table only when it flew at least 100 flights on the pairing over the window — below that, a rate would be a rumor with a decimal point.
Regional airlines file under their own names. A flight sold as American or United is often flown by Envoy, SkyWest or Republic, and it is their filing that lands in this table — the methodology page explains how that works.
The other tools
- Best time to fly — Pick an airport and read the day: what share of departures left on time in each two-hour band, Monday through Sunday.
- Airline comparison — Every reporting carrier side by side: arrival on-time rate, cancellation rate, and what the delay minutes were put down to.
- Connection risk — A layover length and an arrival airport: what share of historical arrivals would have made that connection.
Questions travelers ask
- Which airline should I book on this route?
- The table gives each airline's arrival record on the pairing, with the number of flights behind it — these are the airlines' own monthly filings to the federal government, not opinions. Read them as history. A point or two apart on a few hundred flights is noise; ten points apart over ten thousand flights is a pattern.
- Why is my route missing?
- The site tracks the 1,000 busiest domestic pairings. Below that line a route can carry a few dozen flights a year, and no honest rate comes out of a sample that thin. Both of your airports still have their own pages, with their hour-by-hour and month-by-month records.
- Are these departures or arrivals?
- Arrivals. On a route what matters is landing on time, so a flight counts as on time when it arrives less than 15 minutes behind schedule. The airport pages report departures instead — that is the number you feel while sitting at the gate.
- What does the average delay column mean?
- The average lateness of the flights that were actually late by 15 minutes or more. On-time flights are left out, so the figure is not diluted by them: a pairing can arrive on time 80% of the time and still run an hour late on the other 20%.