Flight profile · Delta Air Lines
DL2055
Seattle (SEA) to Chicago (ORD) · scheduled 7:10 AM – 1:30 PM
How DL2055 performs
712 operations, June 2024 – July 2026.
DL2055 arrived on time 84.1% of the time, against 77.3% for all SEA → ORD flights, so this departure is 6.8 percentage points better than the route as a whole. Against Delta Air Lines’ own flights on this route it is 5.1 points better.
Source: US DOT Bureau of Transportation Statistics · 712 operations, June 2024 – July 2026 · If DL2055 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
Where DL2055 is right now
A live reading, only if you ask for it. It is not part of the reliability record above.
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Against the rest of the route
| Flight or route | On time | Cancelled | Median delay | Severe | Flights |
|---|---|---|---|---|---|
| DL2055 | 84.1% | 0.14% | -7 min | 5.5% | 712 |
| Delta Air Lines on SEA → ORD | 79.0% | 0.74% | -4 min | 7.6% | 2,830 |
| All SEA → ORD flights | 77.3% | 0.95% | -5 min | 6.8% | 16,300 |
Source: FlyerIntel analysis of US DOT BTS data · June 2024 – July 2026
Why DL2055 runs late
Where US DOT attributed the delay minutes on this flight.
airspace and airport capacity, including weather-driven flow control
crew, maintenance, boarding and fueling, all within the carrier’s control
the inbound aircraft was late, so this flight started late
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for DL2055 on SEA → ORD. Only delays of 15 minutes or more are attributed.
Source: US DOT Bureau of Transportation Statistics · Data covering June 2024 – July 2026
Does a late aircraft delay this flight?
How often the plane that flies DL2055 comes in late, and what that does to the departure.
DL2055 is usually the aircraft’s first flight of the day: the schedule gives it a median of 8.3 hours on the ground at SEA, so its “inbound” is mostly the aircraft’s arrival the evening before.
The aircraft flying DL2055 came in 15 or more minutes late on 18% of the departures where its previous flight is known. There are not enough departures in both groups to say how the flight left after a late one and after an on-time one.
Each departure is matched to the flight the same aircraft flew into SEA just before it, using the tail number in the DOT file, 583 of 711 departures in all. A departure is left out when that flight is unknown, was cancelled or diverted, or the aircraft had sat for more than 12 hours. A flight the airline cancelled never left and is not in the count, and one flown by a substitute aircraft is matched to the aircraft that flew it, not to the one first planned.
Against the network at the same turn length
| Share of departures | Inbound landed 15+ late |
|---|---|
| DL2055 | 18% |
| Network, same turn | 29% |
A night on the ground absorbs most of a late arrival, so a late inbound matters far less on a turn this long than on a same-day one.
The network row is every flight with a scheduled turn of 6 hours or more, usually overnight. How often DL2055’s aircraft landed 15 or more minutes late is lower than the network’s. There are not enough departures in both groups to compare how it left.
More: Which Flight Numbers Pay for a Late Aircraft lists the flight numbers that pass a late aircraft on.
Source: US DOT Bureau of Transportation Statistics · Data covering June 2024 – July 2026
From pushback to gate
When it leaves SEA late, does that still matter by the time it reaches ORD?
DL2055 pushes back an average of 2.9 minutes late and reaches the gate at ORD an average of 0.7 minutes late. The 2.1 minutes between those two figures are slack the published schedule already carries, which is why a late pushback on this flight does not reliably become a late arrival. Its 23.1 minutes on the taxiways at SEA is about what any departure from the airport in that hour spends.
On arrival at ORD, DL2055 spends 17.8 min taxiing from touchdown to the gate — ground time a connecting passenger sits through before they can even leave the aircraft, on top of however late the flight itself ran. That is about what any arrival at ORD spends on the ground before reaching the gate.
Departure delay is averaged over every pushback and arrival delay over every completed arrival, so the two counts differ by the flights that never reached ORD. Taxi-out is gate to wheels up and sits inside the scheduled block rather than on top of it; the comparison is 42,963 departures from SEA scheduled in the clock hour DL2055 most often leaves in. Taxi-in is landing to gate, compared against every arrival FlyerIntel has on file at ORD (952,666 flights), not just DL2055’s own. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · June 2024 – July 2026
The hour it leaves SEA
Part of any flight’s record belongs to the clock rather than to the flight. DL2055 has one departure time, so this is what that time is worth.
On-time arrival rate. 42,963 departures from SEA are scheduled in the 7 AM–8 AM hour over the period, against 510,205 across the whole day.
DL2055 is scheduled out of SEA at 7:10 AM, in the 7 AM–8 AM bank. Departures from SEA in that hour arrive on time 85.0% of the time against 79.1% across the airport’s whole day — the slot alone is worth 5.9 points better before anything about this particular flight is considered.
The two airport figures cover every departure from SEA to every destination, so they describe the slot rather than this journey — the like-for-like comparison against the route is above. Hours are scheduled local, and a number whose schedule moved between banks inside the period has no single hour and is not described here at all. Why the hour matters.
Source: FlyerIntel analysis of US DOT BTS data · June 2024 – July 2026 · Hours below 120 departures are not scored.
Other routes DL2055 has flown
A flight number is a slot in a schedule, and carriers reassign it. These are the other city pairs this number served in the analysis period.
| Route | Operated | Flights | On time |
|---|---|---|---|
| ORD→SEA Chicago to Seattle | June 7, 2024 – March 6, 2026 | 400 | 77.3% |
| ATL→GRR Atlanta to Grand Rapids | May 7, 2024 – June 6, 2024 | 26 | — |
| GRR→ATL Grand Rapids to Atlanta | May 7, 2024 – June 6, 2024 | 26 | — |
| SAN→ATL San Diego to Atlanta | April 9, 2024 – May 6, 2024 | 28 | — |
| PDX→SEA Portland to Seattle | September 5, 2023 – April 8, 2024 | 132 | 93.9% |
| SLC→ORD Salt Lake City to Chicago | January 13, 2024 – March 9, 2024 | 44 | — |
| ORD→SLC Chicago to Salt Lake City | January 13, 2024 – March 9, 2024 | 10 | — |
| ATL→FLL Atlanta to Fort Lauderdale | July 1, 2023 – September 4, 2023 | 66 | — |
| FLL→ATL Fort Lauderdale to Atlanta | July 1, 2023 – September 4, 2023 | 66 | — |
Because the same number has served different journeys, the statistics above describe only the route DL2055 currently operates. Blending them would produce an average of two different flights.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
24 min late
against a median of 7 min early
Percentiles over 712 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering June 2024 – July 2026
Other flights on this route
Same airports, same journey, different odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| UA747 | United Airlines | 84.7% | 11 min early | 1,124 |
| DL2055 this flight | Delta Air Lines | 84.1% | 7 min early | 712 |
| AS538 | Alaska Airlines | 80.2% | 3 min early | 1,077 |
| AS328 | Alaska Airlines | 78.2% | 5 min early | 838 |
| DL2108 | Delta Air Lines | 77.0% | 5 min early | 743 |
| AS410 | Alaska Airlines | 60.5% | 7 min late | 900 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. DL2055 is placed in the same ordering rather than left out of it; the rows around it are the most punctual departures on the route, not all of them, so this is a comparison and not a rank. Schedules change; confirm the departure still operates before booking around this.
Data and methodology
Calculated by FlyerIntel from 712 records of DL2055 operating SEA → ORD, published by the US DOT Bureau of Transportation Statistics. A flight counts as delayed when it arrives 15 or more minutes after schedule. Cancelled and diverted flights are excluded from the on-time rate and reported separately. Flight numbers are resolved as carrier plus number plus route, because the same number serves different routes over time.
Full methodology · Data sources · Report a problem
Related research: Most and Least Reliable Flight Numbers · The Delay You Inherit · Making Up Time in the Air
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