Carrier route record
DLBWI→SLC
Delta Air Lines · Baltimore to Salt Lake City
- Flights
- 360
- Period
- September 2025 to August 2026
- Share of route
- 47%
- Carriers
- 2
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Delta Air Lines.
Delta on BWI to SLC lands a B, 3 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 360 flights, with a median arrival 5 minutes early.
The US average over the same twelve months is 77.3%, so there is little to separate Delta on BWI to SLC from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
80.2%
Arrivals under 15 minutes late, of 353 completed flights
Avg delay
62 min
Across delayed arrivals only, not all flights
Cancelled
1.94%
National rate is 1.89%
Whole route
76.3%
Every carrier on BWI to SLC, 769 flights
These figures cover 360 flights between September 2025 and August 2026. The median arrival is 5 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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Carrier by carrier
Delta against every carrier on BWI to SLC
Delta flew 360 of the 769 flights on BWI to SLC, about 47% of it. Its 80.2% on time is 4 points better than the route as a whole, which runs 76.3%. Ranked by on-time rate it is first of two carriers on the route, where the range runs from Delta at 80.2% to Southwest at 72.8%.
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Delta Air Lines (this page)thin sample | 360 | 80.2% | 62 min | 1.94% | B |
| Southwest Airlines | 409 | 72.8% | 52 min | 1.71% | C |
Flight by flight
Delta flight numbers on BWI to SLC
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Departure window
When Delta runs best on this route
Departure time is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 360 flights.
There are not enough flights in each departure window to split Delta's BWI to SLC record by time of day without the percentages moving on noise. The headline rate of 80.2% is the reliable figure here.
Across the year
Delta on BWI to SLC through the year
- Jul–Sep 202530 flights93.3%
- Oct–Dec 202588 flights76.7%
- Jan–Mar 202689 flights82.6%
- Apr–Jun 202691 flights68.9%
- Jul–Sep 202662 flights91.8%
Scale runs 60% to 100%.
Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 80.2% on time across 360 flights.
Delta on BWI to SLC did not run the same all year. Its best quarter was Jul–Sep 2025 at 93.3% on time and its weakest Apr–Jun 2026 at 68.9%, a swing of 24 points on roughly 72 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.
Across the week, Tuesday is the strongest day at 86.3% on time and Saturday the weakest at 76.5%, a spread of 10 points.
Arrival by arrival
How late Delta on BWI to SLC runs when it is late
The 70 late arrivals split 34 under half an hour, 16 between 30 and 60 minutes, and 20 an hour or more.
- 15+ min early86 flights24.4%
- Within 15 min197 flights55.8%
- 15–29 min late34 flights9.6%
- 30–59 min late16 flights4.5%
- 1–2 hours late12 flights3.4%
- 2+ hours late8 flights2.3%
Scale runs 0% to 100%.
Share of 353 completed flights by arrival against schedule.
13 of 60 late departures made up the time and arrived on time, 22% of them. In the other direction, 23 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 SLC.
The worst days
Worst days for Delta on BWI to SLC
The latest arrival of the period was on 28 January 2026, 13 hours 43 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 28 January 2026 | 13 hours 43 minutes | Carrier |
| 26 January 2026 | 4 hours 49 minutes | Carrier |
| 10 November 2025 | 3 hours 19 minutes | Carrier |
| 2 November 2025 | 3 hours 11 minutes | Carrier |
| 20 July 2026 | 2 hours 36 minutes | Carrier |
Delay causes
Why Delta runs late on this route
Carrier accounts for 56% of the 4,359 delay minutes carriers reported here, and the remaining four split what is left.
- 56%Carrier
- 22%Late-arriving aircraft
- 20%National Airspace System
- 2%Extreme weather
The largest share of delay minutes, 56%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,434 of the 4,359 delay minutes reported here. The split is drawn from 4,359 reported delay minutes.
Cancellations sit at 1.94% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and stage length
What a delay here costs
5.7% 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.
At 1,865 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
The return leg runs 78.3% on time across 360 flights, within 2 points of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
One caution: this is a thin sample. 360 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 Delta on BWI to SLC
Put together: treat all of this as provisional. 360 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 80.2% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 353 completed flights over 12 months sit behind that.
Related
Where to go next
- BWI to SLC, every carrier
- Delta on SLC to BWI, the return leg
- Southwest Airlines on BWI to SLC72.8%
- Delta Air Lines network-wide record
- Baltimore/Washington International Thurgood Marshall (BWI) delay statistics
- Salt Lake City International (SLC) delay statistics
- The best day of the week to fly, and why it is the second lever
- How to read this site: grades, sample sizes, and honest caveats
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.