Flight number record
DL 2111
Delta Air Lines · Salt Lake City to Boise
- Route
- SLC → BOI
- Departs
- 22:50
- Flights
- 350
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 2111, check with Delta Air Lines.
DL 2111 lands a B, 2 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 350 flights, with a median arrival 7 minutes early.
Key figures
On time
79.1%
Arrivals under 15 minutes late, of 345 completed flights
Avg delay
64 min
Across delayed arrivals only, not all flights
Cancelled
1.43%
National rate is 1.89%
1 hour+ late
5.5%
National rate is 8.3%
These figures cover 350 flights between September 2025 and August 2026. The median arrival is 7 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 2111 flies
DL 2111 flies SLC to BOI without a single fixed slot. Its most common scheduled departure was 22:50, used on 82 of 350 flights, with 22:45 (76 flights) and 21:50 (52 flights) next.
- Departs 22:5082 flights23.4%
- Departs 22:4576 flights21.7%
- Departs 21:5052 flights14.9%
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 22:50 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and DL 2111 runs 9 points better at 79.1%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
DL 2111 next to SLC to BOI
Every carrier on SLC to BOI combined arrived on time 86.3% of the time across 1,732 flights, so DL 2111 is 7 points behind it. Delta flew 1,219 flights on the same city pair under all its flight numbers, including this one, and those ran 84.0% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2111thin sample | 350 | 79.1% | 64 min | 1.43% | B |
| All Delta Air Lines on SLC–BOI | 1,219 | 84.0% | 61 min | 1.07% | B |
| All carriers on SLC–BOI | 1,732 | 86.3% | 59 min | 0.81% | A+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 2111 quarter by quarter
DL 2111 did not run the same all year. Its best quarter was Oct–Dec 2025 at 84.3% on time and its weakest Jul–Sep 2026 at 68.9%, a swing of 15 points on roughly 88 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 202526 flights—
- Oct–Dec 202585 flights84.3%
- Jan–Mar 202687 flights79.3%
- Apr–Jun 202691 flights77.3%
- Jul–Sep 202661 flights68.9%
Scale runs 60% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, DL 2111 did best on Tuesday at 90.4% on time and worst on Sunday at 68.0%. Each day rests on about 50 flights, so a gap of 22 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 2111 runs when it is late
DL 2111 often beats the schedule: 90 of 345 completed flights, 26%, arrived 15 minutes or more early. The 72 late arrivals split 26 under half an hour, 27 between 30 and 60 minutes, and 19 an hour or more.
- 15+ min early90 flights26.1%
- Within 15 min183 flights53.0%
- 15–29 min late26 flights7.5%
- 30–59 min late27 flights7.8%
- 1–2 hours late13 flights3.8%
- 2+ hours late6 flights1.7%
Scale runs 0% to 100%.
Share of 345 completed flights by arrival against schedule.
24 of 84 late departures made up the time and arrived on time, 29% of them. 12 flights left on time and still arrived late.
The worst days
Worst days for DL 2111
The latest arrival of the period was on 18 May 2026, 9 hours 58 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across May, July, June, December and January, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 18 May 2026 | 9 hours 58 minutes | Carrier |
| 21 July 2026 | 7 hours 55 minutes | Carrier |
| 7 June 2026 | 5 hours 24 minutes | Late-arriving aircraft |
| 7 December 2025 | 3 hours 2 minutes | Late-arriving aircraft |
| 15 January 2026 | 2 hours 36 minutes | Extreme weather |
Delay causes
Why DL 2111 runs late
Carrier accounts for 62% of the 4,592 delay minutes carriers reported here, and the remaining four split what is left.
- 62%Carrier
- 26%Late-arriving aircraft
- 8%National Airspace System
- 5%Extreme weather
The largest share of delay minutes, 62%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,826 of the 4,592 delay minutes reported here. The split is drawn from 4,592 delay minutes reported on DL 2111.
Cancellations sit at 1.43% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
5.5% 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 about an hour, which a normal layover absorbs.
Every one of the 350 flights under DL 2111 in the data flew SLC to BOI. 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. 350 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 2111
For a booking, DL 2111 is one of the weaker ways to fly SLC to BOI: 7 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.
Related
Where to go next
- SLC to BOI, every carrier and departure
- BOI to SLC, the return direction
- Delta Air Lines 1744 on the same route90.2%
- Salt Lake City International (SLC) 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
- Worst months to fly in the US, ranked by the data
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.