SLC to PHL flight delays
Salt Lake City, UT (SLC) Philadelphia, PA (PHL) · 1,927 miles
833 flights · January 2025 – August 2026 · US Bureau of Transportation Statistics
84.67%
Arrived on time
Within 15 minutes of schedule
2.4%
Cancelled
Share of scheduled flights
74 min
When late, late by
Average across delayed arrivals
12 min
Delay per flight
Averaged over every flight flown
What the record says about this route
Which airline you fly changes the odds here. American Airlines arrived on time 6.9 points more often than Delta Air Lines over the same period on the same route — same airports, same weather, same air traffic control. A gap that survives all of that is about how the two airlines are run.
The shape of the lateness matters here. Flights on this route are not late often, but when they are late they are late by about 74 minutes — long enough to lose a connection or an evening. The on-time percentage looks reassuring and understates the consequence of being on the wrong flight.
The season swings this route hard. In May it ran 18.7 points more punctual than in November — a difference bigger than the one between the best and worst airlines on most routes. If the date is flexible, it is worth more than the carrier.
The two directions do not behave alike. PHL to SLC arrives on time 7.7 points less often than the outbound. Delay accumulates through the flying day, so whichever direction is scheduled later tends to carry the worse record — which is an argument for booking the morning departure if the choice exists.
Which airline should you fly on this route?
Over January 2025 – August 2026, American Airlines arrived on time most often on SLC to PHL. Delta Air Lines was late most often. Flights ran closest to schedule in May and worst in November.
Every airline on SLC to PHL
Ranked by how many flights each one operated. A carrier with fewer than 100 flights in the period is listed but not graded.
| Airline | Flights | On time | Cancelled | Avg delay | Grade |
|---|---|---|---|---|---|
| Delta Air Lines | 613 | 82.92% | 1.14% | 49 min | B |
| American Airlines | 220 | 89.81% | 5.91% | 198 min | C |
Month by month
Share of flights that arrived within 15 minutes of schedule, by month flown.
Other routes from Salt Lake City
Common questions
Are flights from Salt Lake City to Philadelphia usually delayed?
84.67% of flights on the SLC to PHL route arrived within 15 minutes of schedule, so roughly 2 in every ten arrived late. That is better than the average route in this record.
Which airline is most on time from Salt Lake City to Philadelphia?
American Airlines, at 89.81% on time across 220 flights. The least punctual on the route was Delta Air Lines at 82.92%.
How often are SLC to PHL flights cancelled?
2.4% of scheduled flights did not operate — about 24 in every thousand. That is in the normal range.
What is the best month to fly Salt Lake City to Philadelphia?
May, when 91.4% of flights arrived on time. The worst was November at 72.7%.
When SLC to PHL flights are late, how late are they?
About 74 minutes on average across the flights that arrived more than 15 minutes behind schedule.
What these figures do and do not tell you
Everything on this page is counted from the flights that actually operated on SLC to PHL during January 2025 – August 2026, as reported by the airlines to the US Bureau of Transportation Statistics. "On time" is the federal definition: arriving at the gate within 15 minutes of the scheduled time.
A route's record is a description of the past, not a forecast. Weather, air traffic control and the aircraft's earlier flights that day drive most delays, and none of them are predictable from a historical rate. What the record does tell you is whether this route runs late more often than others, and which carrier on it has the better history — which is the part you can actually act on when you book.
Cancellations are counted separately from delays because they are a different problem for a traveller: a late flight still gets you there. How the grade is calculated →