Airline · DL · United StatesHow reliable is Delta Air Lines?
Delta Air Lines runs 88% on time across 9,052,509 flights of official airline-reported history. Here’s how it really performs — including when it’s late and on which routes.
Reliability score
on-time, cancellations & delays
Network reliability
Delta Air Lines’s on-time record across its whole network
Source: BTS TranStats · data through 2026-06-25. On-time and cancellations are airline-controllable (cause-attributed). Advisory context, not a guarantee for any one flight.
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When flights run late
It’s not just if Delta Air Lines is late — it’s how late
Of every 100 Delta Air Lines flights, how they actually land — on time, or in each lateness band. A short delay is a nuisance; a 2-hour delay misses connections.
Routes
Where Delta Air Lines shines — and where it struggles
Its most and least reliable routes by on-time rate (routes with a meaningful sample). Tap an airport for its full profile.
The read on Delta Air Lines
What the record actually tells you about flying Delta Air Lines
Delta Air Lines runs about 88% on time across 9,052,509 flights of official airline-controllable history — one of the better on-time records in the data. On cancellations, cancellations are rare here, at roughly 0.6%. Worth noting, its on-time rate has slipped recently — down about 1.3 points versus the prior year.
It's not just whether a flight is late, but how late. When Delta Air Lines runs behind, the typical delay lands around 10 minutes, and only a small slice — about 2.0% — slip two hours or more, so the worst-case tail is relatively contained.
Reliability isn't uniform across Delta Air Lines's map. Its strongest route in the data is SLC–HLN, running around 97% on time, while ANC–ATL is among its weakest at about 57%. That gap is the whole point: judge Delta Air Lines on the route you're actually flying, not on its overall average.
A track record is the backdrop, not a verdict on your flight. To put it to work, score your actual Delta Air Lines flight on reliability, weather, and connection safety, see how the PlaneSane Score works, and read are some airlines really more reliable and how to read on-time stats.
Common questions about Delta Air Lines
- How often is Delta Air Lines on time?
- Delta Air Lines (DL) ran about 88% on time across 9,052,509 flights of official airline-reported history — one of the better on-time records in the data. Its cancellation rate is roughly 0.6%.
- Is Delta Air Lines a reliable airline?
- On the numbers, Delta Air Lines has one of the better on-time records in the data. Typical delays run around 10 minutes when flights are late. Reliability varies by route and time of day, so check your specific flight rather than the brand average. It's advisory context, not a guarantee for any one flight.
- Which routes does Delta Air Lines fly most reliably?
- In our data, SLC–HLN is among Delta Air Lines's most reliable routes at about 97% on time, while ANC–ATL is among its weakest near 57%. The same airline can perform very differently route to route.
Flying Delta Air Lines?
Score your actual flight on reliability, weather, and connection safety before you book — Delta Air Lines’s track record is just the start.