80% of flights from Salt Lake City to Baltimore arrived on time over the past 12 months. That is about the typical U.S. route. Most reliable airline: Southwest Airlines (82%). 5% of flights arrived more than an hour late or not at all.
How late?
The on-time rate treats a flight 20 minutes late the same as one 5 hours late. Here's the split for SLC → BWI: when a flight was late, it was under 45 minutes late 75% of the time. About 1 in 35 flights landed an hour or more late; 1.6% were cancelled outright.
- On time or early80%
- 15–30 min late11%
- 30–60 min late4.8%
- 1–2 hours late1.8%
- 2–3 hours late1.0%
- 3+ hours late0.0%
- Diverted0.4%
- Cancelled1.6%
Share of all 769 scheduled flights, past 12 months, by arrival time against schedule.
By airline
| Airline | Flights | On time | Cancelled | Typical arrival | 1h+ late | Avg when late | Operated by |
|---|---|---|---|---|---|---|---|
| Southwest Airlines | 409 | 82% | 1.2% | −8 min | 3.4% | +47 min | Southwest Airlines |
| Delta Air Lines | 360 | 76% | 1.9% | +1 min | 2.2% | +35 min | Delta Air Lines |
Airline = the name on the ticket. Regional flights (e.g. "Delta Connection") count under the ticketing airline, and the operator is listed.
Best time of day to fly
On-time rate by scheduled departure hour (local time at SLC). Delays build through the day as late planes knock on, so early flights usually do best.
By airline and hour
| Departs | Southwest Airlines | Delta Air Lines |
|---|---|---|
| 11 p.m. | 88% | 75% |
By month
Each calendar month pooled over 2023–2026. Best: April (88%). Worst: August (66%).
By day of week
| Day | Flights | On time | Cancelled |
|---|---|---|---|
| Monday | 111 | 76% | 1.8% |
| Tuesday | 105 | 87% | 0.0% |
| Wednesday | 101 | 87% | 1.0% |
| Thursday | 107 | 78% | 0.0% |
| Friday | 107 | 76% | 0.0% |
| Saturday | 128 | 88% | 1.6% |
| Sunday | 110 | 66% | 6.4% |
Why flights were late
Share of delay minutes on flights 15+ minutes late, as reported to BTS by the airlines.
Cancellations: airline 8 · weather 4
Month by month
Not enough months with data to draw a trend.
Flight numbers on this route
Regular flights with at least 120 scheduled trips in the past year. Sorted by departure time.
| Flight | Departs | Flights | On time | Cancelled | Typical arrival | Operated by |
|---|---|---|---|---|---|---|
| DL 2079 | 11:40 p.m. | 360 | 76% | 1.9% | +1 min | Delta Air Lines |
Worst days in the past year
| Date | Flights | On time | Cancelled |
|---|---|---|---|
| Jan 25, 2026 | 3 | 0% | 3 |
| Feb 23, 2026 | 3 | 33% | 0 |
| Feb 22, 2026 | 3 | 33% | 2 |
| Feb 13, 2026 | 3 | 67% | 0 |
| Feb 1, 2026 | 3 | 67% | 0 |
Nearby airport alternatives
Other ways to make the same trip, using airports within 60 miles of Salt Lake City or Baltimore. SLC → IAD has been 3 points more reliable.
| Route | Flights | On time | Cancelled |
|---|---|---|---|
| SLC → BWI (this route) | 769 | 80% | 1.6% |
| SLC → IAD Salt Lake City to Washington Dulles | 702 | 83% | 1.7% |
Questions
How often are flights from SLC to BWI on time?
80% of 769 scheduled flights from Salt Lake City, UT to Baltimore, MD arrived within 15 minutes of schedule between September 2025 and August 2026. 1.6% were cancelled.
Which airline is most on time from SLC to BWI?
Southwest Airlines: 82% of its 409 flights on the route arrived on time. Delta Air Lines: 76%.
What month has the most delays from SLC to BWI?
August (66% on time). The best month is April (88%), over 2023–2026.
Related
- BWI → SLC (return)
- Salt Lake City (SLC) delays by hour
- Flights into Baltimore/Washington (BWI)
- Southwest Airlines on-time record
- Delta Air Lines on-time record
- Connecting off this flight? Check the risk
Domestic flights by the airlines that report to the U.S. DOT, plus their regional partners. "On time" means arriving less than 15 minutes after schedule; cancelled and diverted flights count as not on time. Past performance is a guide, not a forecast. Method.