Flight number record
DL 2105
Delta Air Lines · Kansas City to Seattle
- Route
- MCI → SEA
- Departs
- 07:00
- Flights
- 364
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 2105, check with Delta Air Lines.
DL 2105 earns an A. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 10 points better than the national rate of 77.3%. When something does go wrong the average delay runs a little over an hour. That rests on 364 flights, with a median arrival 8 minutes early.
Set against the rest of the country, DL 2105's record is 10 points better than the US average of 77.3%. That gap is worth roughly 97 fewer late arrivals for every thousand flights.
Key figures
On time
87.0%
Arrivals under 15 minutes late, of 354 completed flights
Avg delay
75 min
Across delayed arrivals only, not all flights
Cancelled
1.65%
National rate is 1.89%
1 hour+ late
3.1%
National rate is 8.3%
These figures cover 364 flights between September 2025 and August 2026. The median arrival is 8 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Schedule
When DL 2105 flies
DL 2105 flies MCI to SEA without a single fixed slot. Its most common scheduled departure was 07:00, used on 119 of 364 flights, with 07:55 (93 flights) next.
- Departs 07:00119 flights32.7%
- Departs 07:5593 flights25.5%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 07:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 2105 runs 2 points worse at 87.0%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
DL 2105 next to MCI to SEA
Every carrier on MCI to SEA combined arrived on time 85.0% of the time across 1,126 flights, so DL 2105 is 2 points ahead of it. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 6 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2105thin sample | 364 | 87.0% | 75 min | 1.65% | A |
| All Delta Air Lines on MCI–SEAthin sample | 364 | 87.0% | 75 min | 1.65% | A |
| All carriers on MCI–SEA | 1,126 | 85.0% | 65 min | 0.98% | A+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 2105 quarter by quarter
DL 2105 did not run the same all year. Its best quarter was Jul–Sep 2026 at 96.8% on time and its weakest Jan–Mar 2026 at 81.4%, a swing of 15 points on roughly 91 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Jul–Sep 202530 flights—
- Oct–Dec 202591 flights82.0%
- Jan–Mar 202690 flights81.4%
- Apr–Jun 202691 flights88.6%
- Jul–Sep 202662 flights96.8%
Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, DL 2105 ranged from 82.0% on Friday to 88.5% on Monday. With about 52 flights behind each day, a spread of 7 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late DL 2105 runs when it is late
DL 2105 often beats the schedule: 125 of 354 completed flights, 35%, arrived 15 minutes or more early. Most of the lateness is short. 24 of the 46 late arrivals were under half an hour behind, and 11 reached an hour or more.
- 15+ min early125 flights35.3%
- Within 15 min183 flights51.7%
- 15–29 min late24 flights6.8%
- 30–59 min late11 flights3.1%
- 1–2 hours late6 flights1.7%
- 2+ hours late5 flights1.4%
Scale runs 0% to 100%.
Share of 354 completed flights by arrival against schedule.
A late pushback is often recovered here: of 28 departures that left 15 minutes late or more, 9 still arrived on time. In the other direction, 27 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at SEA.
The worst days
Worst days for DL 2105
The latest arrival of the period was on 24 October 2025, 10 hours 19 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 24 October 2025 | 10 hours 19 minutes | Carrier |
| 30 January 2026 | 7 hours 52 minutes | Carrier |
| 5 September 2025 | 5 hours 57 minutes | Carrier |
| 12 December 2025 | 5 hours 46 minutes | Late-arriving aircraft |
| 11 April 2026 | 3 hours 30 minutes | Carrier |
Delay causes
Why DL 2105 runs late
Carrier accounts for 72% of the 3,428 delay minutes carriers reported here, and the remaining four split what is left.
- 72%Carrier
- 22%National Airspace System
- 6%Late-arriving aircraft
- 1%Extreme weather
The largest share of delay minutes, 72%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,451 of the 3,428 delay minutes reported here. The split is drawn from 3,428 delay minutes reported on DL 2105.
Cancellations sit at 1.65% against a national 1.89%, which is ordinary. Diversions add another 1.10%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 3.1% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
The 1,490 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.
Every one of the 364 flights under DL 2105 in the data flew MCI to SEA. The number was not reused on any other city pair, which makes this a clean record of one route.
One caution: this is a thin sample. 364 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking DL 2105
For a booking, read DL 2105 as 87.0% on time with 1.65% cancelled over 364 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- MCI to SEA, every carrier and departure
- SEA to MCI, the return direction
- Alaska Airlines 418 on the same route83.3%
- Alaska Airlines 563 on the same route90.5%
- Kansas City International (MCI) delay statistics
- Seattle-Tacoma International (SEA) delay statistics
- Delta Air Lines on-time record
- Every Delta Air Lines flight number with a record
- The most and least reliable flight numbers in the US
- The best time of day to fly, according to 7.05 million flight records
A flight number here means Delta Air Lines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
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.