Route profile
BWI→SLC
Flight reliability, delays and best times to fly from Baltimore to Salt Lake City, 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 70% of comparable major US routes (4,598 compared)
Calculated from 2,274 flights. How this is calculated · What counts as on time
BWI → SLC arrives on time 79.2% of the time; the return trip, SLC → BWI, arrives on time 78.8% of the time.
BWI → SLC spends 22.7 minutes on the ground on a 1,865-mile trip: 15.0 minutes from pushback to wheels-up at BWI and 7.8 minutes from touchdown to gate at SLC.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
What stands out
Which day you fly matters unusually much here, a wider weekday spread than 98% of 4,467 comparable routes.
87.9% on time on a typical Tuesday, against 70.2% on a Saturday.
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 4,467 in the comparison.
What sets this route apart
Where BWI to SLC differs most from similar routes by hour, weekday, month and airline, July 2023 – July 2026.
BWI to SLC struggles most at 6 AM: 81.1% of its flights scheduled then arrive on time, 8.7 points behind the 89.8% on routes of similar length at the same hour. Against all other routes the gap is 9.7 points.
Saturday is the day BWI to SLC slips furthest against routes of similar length, 70.2% on time where they average 78.9%, 8.7 points lower. Against all other routes the gap is 8.9 points.
BWI to SLC holds up on Tuesdays better than routes of similar length do: 87.9% on time to their 81.2%, a 6.7 points lead. Against all other routes the gap is 6.3 points.
October is kinder to BWI to SLC than to routes of similar length: 89.2% on time against 83.6%, 5.6 points better. Against all other routes the gap is 6.2 points.
BWI to SLC against comparable routes
July 2023 – July 2026| Measure | This route | Compared with | Them | Gap | Flights behind it |
|---|---|---|---|---|---|
| Hour: 6 AM departures | 81.1% | routes of similar length | 89.8% | −8.7 pts | 164 here, 78,257 there |
| Weekday: Saturday | 70.2% | routes of similar length | 78.9% | −8.7 pts | 366 here, 168,076 there |
| Weekday: Tuesday | 87.9% | routes of similar length | 81.2% | +6.7 pts | 313 here, 167,083 there |
| Month: October | 89.2% | routes of similar length | 83.6% | +5.6 pts | 185 here, 103,197 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
33 min late
against a median of 5 min early
Percentiles over 2,274 operations; cancelled and diverted flights are counted separately.
Will your connection be tight enough?
Layovers at SLC after arriving from BWI.
| Connection time | Chance of missing | Reads as |
|---|---|---|
| 30 min | 40% | Likely to miss |
| 45 min | 20% | High risk |
| 60 min | 11% | Some risk |
| 90 min | 5.1% | Some risk |
| 120 min | 3.0% | 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 0.88% of the time and diverts 0.04% 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 33 minutes late (90th-percentile gate arrival delay), over 2,274 operations.
Any other layover length: connection checker.
Best time to fly
BWI → SLC flights departing 5–9 AM arrived on time 84.2% of the time, against 55.7% for 6–9 PM departures, a gap of 28.5 percentage points.
By departure window
By departure hour
- 12 AM to 5 AM: too few flights to score
- 6 AM: 81.1% on time from 164 flights
- 7 AM: 83.9% on time from 969 flights
- 8 AM: 88.6% on time from 186 flights
- 9 AM: 77.5% on time from 272 flights
- 10 AM: 79.8% on time from 170 flights
- 11 AM to 12 PM: too few flights to score
- 1 PM: 76.0% on time from 123 flights
- 2 PM to 11 PM: too few flights to score
Departure windows with fewer than 120 flights are not scored.
Why BWI → SLC 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 BWI → SLC. 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 | 1,158 | 75.3% | 0.78% | 0 min | 6.0% |
| Delta Air Lines | 1,116 | 83.3% | 0.99% | -9 min | 4.4% |
Southwest Airlines flew 50.9% of the 2,274 flights listed.
Delta Air Lines arrived on time 8.0 percentage points more often than Southwest Airlines on this route.
Flights on this route
Flight numbers with at least 600 operations here and still on the schedule.
| Flight | Scheduled | Operations | On time |
|---|---|---|---|
| DL1176 Delta Air Lines | 7:15 AM | 1,115 | 83.2% |
Weekly and seasonal patterns
By day of week
Tuesday is historically the most reliable day and Saturday the least, a gap of 17.7 percentage points.
By month
- Jan: 79.6%
- Feb: 79.7%
- Mar: 74.5%
- Apr: 82.9%
- May: 76.2%
- Jun: 67.0%
- Jul: 75.1%
- Aug: 79.6%
- Sep: 84.1%
- Oct: 89.2%
- Nov: 87.4%
- Dec: 77.9%
June is historically the weakest month and October the strongest, a spread of 22.2 percentage points.
Reliability over time
July 2023 – July 2026
Over the most recent 12 months (2025-08 to 2026-07), on-time arrivals averaged 77.3% against 80.7% in the 12 months before — declining by 3.4 percentage points.
Data and methodology
Calculated by FlyerIntel from 2,274 BWI → SLC 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