Route on-time record
SLC to BWI: most on-time flights and the best time to fly
Salt Lake City (Salt Lake City International Airport) to Baltimore (Baltimore/Washington International Thurgood Marshall Airport). 770 nonstop flights in Jun 2025 to May 2026, 80% arrived within 15 minutes and 1.4% were cancelled. The most reliable flight number was Southwest 4289 at 11:35 PM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
SLC → BWI
Salt Lake City to Baltimore: 770 nonstop flights a year
On time (12 months)
80%
Cancelled
1.4%
avg delay 11 min
Best time to leave
Before 9 AM
95% on time vs 78% noon to 3 PM
Most reliable airline
Southwest
81% chance on time
Lowest nonstop fare seen in the next two months: $468 (Southwest 3869 on 2026-10-23). Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Most reliable nonstop flights
Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.
#1 · Southwest 4289
11:35 PM → 5:40 AM4h 05m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 2818; its record covers all of them.
87%
chance on time
- On time (history)
- 91%
- Cancelled
- 0.0%
- Avg arrival delay
- 2 min
- Arrived on time 91% of the time (55 flights, Jun 2025 to May 2026).
- Never cancelled in 55 scheduled flights.
Limited track record · 55 flights
Find Southwest 4289 fares Opens this date on Aviasales#2 · Delta 2079
11:40 PM → 5:51 AM4h 05m nonstop
Local times, typical schedule. Last flown 2026-05-31.
77%
chance on time
- On time (history)
- 78%
- Cancelled
- 1.7%
- Avg arrival delay
- 10 min
- Arrived on time 78% of the time (353 flights, Jun 2025 to May 2026).
Strong track record · 353 flights
Find Delta 2079 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Southwest Airlines81%
410 flights · 82% on time as flown · 1.3% cancel
- Delta Air Lines77%
360 flights · 78% on time as flown · 1.6% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM95%
58 flights · avg delay 10 min
- 9 AM to noon79%
80 flights · avg delay 13 min
- Noon to 3 PM78%
168 flights · avg delay 16 min
- 3 to 6 PM79%
99 flights · avg delay 11 min
- After 9 PM80%
365 flights · avg delay 9 min
Best day: Tuesday (83%). Worst: Friday (73%).
Smarter routing
Nearby airports that run more on time
SLC → IAD 85% chance on time
Salt Lake City International Airport to Washington Dulles International Airport · 714 flights a year · 45 mi from your airports · yours: 79%
SLC → DCA 84% chance on time
Salt Lake City International Airport to Ronald Reagan Washington National Airport · 365 flights a year · 30 mi from your airports · yours: 79%
On time by month
All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.
What delays this route
- Airline (crew, maintenance, boarding)38%
- Late-arriving aircraft34%
- Air traffic control and airport volume26%
- Severe weather2%
Share of delay minutes by the cause airlines report to the US DOT.
Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure
SLC to BWI questions
- What time of day is best to fly SLC to BWI?
- Before 9 AM: 95% of flights arrived on time, against 78% for departures noon to 3 PM. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
- Which airline is most on time from SLC to BWI?
- Southwest, with a season-adjusted 81% chance of operating and arriving on time over 410 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
- What is the worst month for delays on SLC to BWI?
- August (67% on time); the best was April (89%), averaged over Jun 2023 to May 2026.
- Is this a prediction for my flight?
- No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.
More routes from SLC
- BWI to SLC (return)
- SLC to DEN 77%
- SLC to PHX 84%
- SLC to SEA 79%
- SLC to LAX 86%
- SLC to DFW 78%
- SLC to LAS 78%
- SLC to SFO 72%
- SLC to ORD 75%
- SLC to ATL 86%
- SLC to SAN 84%
- SLC to PDX 88%
- SLC to SMF 86%
Most on-time flights from SLC on every route →
Live status: FAA delays and ground stops