Route profile
SLC→BWI
Flight reliability, delays and best times to fly from Salt Lake City to Baltimore, 1,865 miles.
Right now
Aviation weather is not currently a factor.
Aviation weather is not currently a factor.
Route reliability
July 2023 – July 2026
Better than 79% of comparable major US routes (4,598 compared)
Calculated from 2,277 flights. How this is calculated · What counts as on time
SLC → BWI arrives on time 78.8% of the time; the return trip, BWI → SLC, arrives on time 79.2% of the time.
SLC → BWI spends 26.2 minutes on the ground on a 1,865-mile trip: 15.1 minutes from pushback to wheels-up at SLC and 11.2 minutes from touchdown to gate at BWI.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
What stands out
Every airline on this route performs about the same, a narrower carrier gap than 99% of 2,692 comparable routes.
Delta Air Lines (78.9% on time) and Southwest Airlines (78.7%) are close together here.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · Ranked against every other route with the same kind of figure and at least 2,692 in the comparison.
What sets this route apart
Where SLC to BWI differs most from similar routes by hour, weekday, month and airline, July 2023 – July 2026.
SLC to BWI is at its best against routes of similar length for flights scheduled at 5 PM: 85.6% arrive on time, 12.6 points ahead of the 73.0% those routes manage at that hour. Against all other routes the gap is 15.8 points.
SLC to BWI holds up on Saturdays better than routes of similar length do: 83.8% on time to their 78.9%, a 4.9 points lead. Against all other routes the gap is 4.7 points.
In August, SLC to BWI runs 9.5 points below routes of similar length, 66.7% on time to 76.2%. Against all other routes the gap is 9.8 points.
April is kinder to SLC to BWI than to routes of similar length: 89.0% on time against 80.1%, 8.9 points better. Against all other routes the gap is 9.1 points.
Southwest Airlines does better on SLC to BWI than on its routes of similar length: 78.7% on time here, 75.1% there, 3.6 points apart.
SLC to BWI against comparable routes
July 2023 – July 2026| Measure | This route | Compared with | Them | Gap | Flights behind it |
|---|---|---|---|---|---|
| Hour: 5 PM departures | 85.6% | routes of similar length | 73.0% | +12.6 pts | 181 here, 79,984 there |
| Weekday: Saturday | 83.8% | routes of similar length | 78.9% | +4.9 pts | 370 here, 168,072 there |
| Month: August | 66.7% | routes of similar length | 76.2% | −9.5 pts | 162 here, 106,802 there |
| Month: April | 89.0% | routes of similar length | 80.1% | +8.9 pts | 181 here, 99,607 there |
| Airline: Southwest Airlines | 78.7% | routes of similar length | 75.1% | +3.6 pts | 1,148 here, 190,663 there |
Each comparison pools the flights of other routes, with this route’s own left out. Similar length means within 15% of this route’s 1,865 miles, with at least 5 such routes. A bucket is set against the most comparable group that has enough flights: similar length, then the same origin (at least 3 routes), then all other routes. Hours, weekdays and months appear only where both sides have 120 completed flights, and airlines where both have 600. The gap must be at least 2 points and 2 standard errors, and only the largest gap each way is kept per measure. These are differences in the flights counted, not causes.
When it goes wrong
July 2023 – July 2026
29 min late
against a median of 3 min early
Percentiles over 2,277 operations; cancelled and diverted flights are counted separately.
Will your connection be tight enough?
Layovers at BWI after arriving from SLC.
| Connection time | Chance of missing | Reads as |
|---|---|---|
| 30 min | 43% | Likely to miss |
| 45 min | 20% | High risk |
| 60 min | 9.3% | Some risk |
| 90 min | 3.4% | Low risk |
| 120 min | 1.9% | Low risk |
This is one leg of a connection. Gate changes and the next flight's own schedule matter too. And a connection can fail before delay is even the question — this route cancels 0.83% of the time and diverts 0.22% of the time, which a late arrival never shows up in.
Chance of missing is the share of 2,253 arrivals on this route that landed later than the connection time less 30 minutes to reach the next gate.
The worst tenth of arrivals on this route land at least 29 minutes late (90th-percentile gate arrival delay), over 2,277 operations.
Any other layover length: connection checker.
Best time to fly
SLC → BWI flights departing 9 AM–12 PM arrived on time 81.6% of the time, against 75.5% for 12–3 PM departures, a gap of 6.1 percentage points.
By departure window
By departure hour
- 12 AM to 11 AM: too few flights to score
- 12 PM: 76.3% on time from 208 flights
- 1 PM: 74.4% on time from 202 flights
- 2 PM: 75.6% on time from 242 flights
- 3 PM to 4 PM: too few flights to score
- 5 PM: 85.6% on time from 185 flights
- 6 PM to 10 PM: too few flights to score
- 11 PM: 79.1% on time from 1,078 flights
Departure windows with fewer than 120 flights are not scored.
Why SLC → BWI runs late
July 2023 – July 2026
crew, maintenance, boarding and fueling, all within the carrier’s control
the inbound aircraft was late, so this flight started late
airspace and airport capacity, including weather-driven flow control
weather severe enough to stop this flight specifically
screening or terminal security incidents
Share of the delay minutes US DOT attributed to each cause for SLC → BWI. Only delays of 15 minutes or more are attributed. What the five causes mean
Airlines on this route
Carriers with at least 200 flights, by the airline that operated each one.
| Carrier | Flights | On time | Cancelled | Median delay | Severe |
|---|---|---|---|---|---|
| Southwest Airlines | 1,161 | 78.7% | 0.78% | -4 min | 4.1% |
| Delta Air Lines | 1,116 | 78.9% | 0.90% | -2 min | 2.7% |
Southwest Airlines flew 51.0% of the 2,277 flights listed.
Carriers on this route performed within a couple of percentage points of each other.
Flights on this route
Flight numbers with at least 600 operations here and still on the schedule.
| Flight | Scheduled | Operations | On time |
|---|---|---|---|
| DL2079 Delta Air Lines | 11:40 PM | 775 | 75.7% |
Weekly and seasonal patterns
By day of week
Tuesday is historically the most reliable day and Friday the least, a gap of 11.3 percentage points.
By month
- Jan: 80.1%
- Feb: 81.6%
- Mar: 83.4%
- Apr: 89.0%
- May: 74.7%
- Jun: 73.9%
- Jul: 72.1%
- Aug: 66.7%
- Sep: 81.9%
- Oct: 84.2%
- Nov: 86.4%
- Dec: 72.1%
August is historically the weakest month and April the strongest, a spread of 22.3 percentage points.
Reliability over time
July 2023 – July 2026
Over the most recent 12 months (2025-08 to 2026-07), on-time arrivals averaged 81.4% against 77.4% in the 12 months before — improving by 4.0 percentage points.
Data and methodology
Calculated by FlyerIntel from 2,277 SLC → BWI flight records from the US DOT Bureau of Transportation Statistics, covering July 2023 – July 2026. Late means 15 or more minutes past scheduled arrival; cancelled and diverted flights are left out of on-time rates.
Full methodology · Data sources · Report a problem
Related research: How Long a Layover Needs to Be · Two Airlines on One Route · Best Time of Day to Fly From Major US Airports
Analysis last recomputed