Carrier route record

DLBWI→SLC

Delta Air Lines · Baltimore to Salt Lake City

Flights: 360
Period: July 2025 to June 2026
Share of route: 47%
Carriers: 2

Historical statistics for July 2025 to June 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 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 360 flights, with a median arrival 5 minutes early.

The US average over the same twelve months is 77.6%, 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.

On time

80.2%

Arrivals under 15 minutes late, of 354 completed flights

Avg delay

59 min

Across delayed arrivals only, not all flights

Cancelled

1.67%

National rate is 1.81%

Whole route

77.0%

Every carrier on BWI to SLC, 770 flights

These figures cover 360 flights between July 2025 and June 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.

Carrier by carrier

Delta against every carrier on BWI to SLC

Delta flew 360 of the 770 flights on BWI to SLC, about 47% of it. Its 80.2% on time is 3 points better than the route as a whole, which runs 77.0%. 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 74.2%.

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.

On-time performance by carrier on BWI to SLC
Airline	Flights	On time	Avg delay	Cancelled	Grade
Delta Air Lines (this page)thin sample	360	80.2%	59 min	1.67%	B
Southwest Airlines	410	74.2%	53 min	1.46%	C

Flight by flight

Delta flight numbers on BWI to SLC

DL 117607:1580.2% · 360 flights

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 202592 flights92.4%
Oct–Dec 202588 flights76.7%
Jan–Mar 202689 flights82.6%
Apr–Jun 202691 flights68.9%

Scale runs 60% to 100%. Rows with fewer than 30 flights show a dash.

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 92.4% on time and its weakest Apr–Jun 2026 at 68.9%, a swing of 24 points on roughly 90 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 88.5% on time and Friday the weakest at 72.5%. 16 points is a smaller lever than departure hour, but it is free.

Delay causes

Why Delta runs late on this route

One category carries most of the weight here. Carrier accounts for 56% of the 4,136 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Carrier
56%
Late-arriving aircraft
22%
National Airspace System
20%
Extreme weather
2%

The largest share of delay minutes, 56%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 2,314 of the 4,136 delay minutes reported here. The split is drawn from 4,136 reported delay minutes.

Cancellations sit at 1.67% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and stage length

What a delay here costs

Badly late arrivals are rare here: only 4.8% land an hour or more behind schedule, against 8.1% 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.

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 77.9% 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. 354 completed flights over 12 months sit behind that.

Where to go next

Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures