ON TIMEBOARD
Delta Air Lines / SLC → STL

DL 2455 on time

Delta Air Lines 2455: Salt Lake City to St. Louis at 9:40 a.m.; St. Louis to Salt Lake City at 2:20 p.m. (past 12 months). Figures below the title are for SLC → STL, its busiest leg

On time
89%
297 flights · likely 85–92%
Cancelled
0.0%
of scheduled flights
Typical arrival
−10 min
median vs schedule
When late
+45 min
average delay
Similar flights
88%
DL, same route & hour

About 1 in 9 DL 2455 flights from Salt Lake City arrived 15+ minutes late, diverted or cancelled over the past year (11%); 0.0% were cancelled. The typical flight landed 10 minutes early.

DL 2455: SLC → STL

Scheduled to leave Salt Lake City at 9:40 a.m. local time. Over the past year it arrived on time 89% of the time (297 flights), in line with other DL flights on the route at that hour (88%). Last seen in the data Aug 31, 2026.

Month by month

40%70%100%Aug 2025: 90% on time (29 flights)90AugSep 2025: 80% on time (30 flights)80SepOct 2025: 100% on time (31 flights)100OctNov 2025: 90% on time (29 flights)90NovDec 2025: 84% on time (31 flights)84DecJan 2026: too few flights (4 flights)JanMar 2026: 95% on time (21 flights)95MarApr 2026: 89% on time (28 flights)89AprMay 2026: 97% on time (31 flights)97MayJun 2026: 83% on time (30 flights)83JunJul 2026: 97% on time (31 flights)97JulAug 2026: 74% on time (31 flights)74Aug

By day of week

DayFlightsOn time
Monday4480%
Tuesday4395%
Wednesday4388%
Thursday4290%
Friday4395%
Saturday3884%
Sunday4489%

Why it was late

Airline (crew, maintenance, ops) 73%Air traffic & airport (NAS) 17%Late inbound plane 6%Severe weather 3%

All flights SLC → STL · Connecting off DL 2455? Check the risk

DL 2455: STL → SLC

Scheduled to leave St. Louis at 2:20 p.m. local time. Over the past year it arrived on time 88% of the time (261 flights), in line with other DL flights on the route at that hour (85%). Last seen in the data Aug 31, 2026.

Month by month

40%70%100%Aug 2025: 83% on time (23 flights)83AugSep 2025: 96% on time (26 flights)96SepOct 2025: 96% on time (26 flights)96OctNov 2025: 88% on time (24 flights)88NovDec 2025: 79% on time (29 flights)79DecJan 2026: too few flights (4 flights)JanMar 2026: 95% on time (21 flights)95MarApr 2026: 85% on time (26 flights)85AprMay 2026: 92% on time (26 flights)92MayJun 2026: 77% on time (26 flights)77JunJul 2026: 96% on time (27 flights)96JulAug 2026: 73% on time (26 flights)73Aug

By day of week

DayFlightsOn time
Monday4480%
Tuesday4391%
Wednesday4391%
Thursday4288%
Friday4193%
Saturday4—
Sunday4486%

Why it was late

Late inbound plane 57%Airline (crew, maintenance, ops) 30%Air traffic & airport (NAS) 11%Severe weather 1%Security 1%

All flights STL → SLC · Connecting off DL 2455? Check the risk

Questions

How often is DL 2455 from SLC to STL late?

Delta Air Lines 2455 from Salt Lake City, UT to St. Louis, MO arrived 15 or more minutes late, was diverted or was cancelled on 11% of 297 scheduled flights between September 2025 and August 2026. 0.0% were cancelled.

How often is DL 2455 from STL to SLC late?

Delta Air Lines 2455 from St. Louis, MO to Salt Lake City, UT arrived 15 or more minutes late, was diverted or was cancelled on 12% of 261 scheduled flights between September 2025 and August 2026. 0.4% were cancelled.

Flight numbers change. Figures cover flights with this airline, number and route only. "Likely range" is the 95% interval for the true on-time rate given the number of flights. This is history, not live status: check Delta Air Lines for today's flight. Method.