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Route · SLC → PHL · 2020–2025 BTS data

Salt Lake City to Philadelphia

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), SLC to PHL (Salt Lake City to Philadelphia) ranks #3297 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

82.1%
On-time
+3.1 pts
vs US avg
66 min
Delay when late
3,000
Flights
#3297 of 4927
Corpus placement

Cancelled

1.9%

Best Month

Aug 2025 90%

Worst Month

Jul 2024 74%

Distance

1,927 mi

Carriers

3

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 62 12 1 0 DL,AA
Nov 2025 44 12 0 0 DL
Oct 2025 48 8 0 0 DL
Sep 2025 49 5 0 0 DL,AA
Aug 2025 86 9 2 1 AA,DL
Jul 2025 92 17 6 2 AA,DL
Jun 2025 83 17 2 0 AA,DL
May 2025 48 8 0 0 DL
Apr 2025 46 8 0 0 DL
Mar 2025 49 13 0 0 DL
Feb 2025 42 4 0 0 DL
Jan 2025 51 6 0 0 AA,DL
Dec 2024 67 8 1 0 AA,DL
Nov 2024 53 6 0 0 DL,AA
Oct 2024 45 5 0 0 DL
Sep 2024 49 5 0 0 AA,DL
Aug 2024 86 19 4 0 AA,DL
Jul 2024 86 22 8 2 AA,DL
Jun 2024 80 15 3 0 AA,DL
May 2024 48 9 0 0 DL
Apr 2024 47 14 0 0 DL
Mar 2024 49 16 0 0 DL
Feb 2024 37 4 0 0 DL
Jan 2024 46 10 0 0 AA,DL

SLC–PHL seasonal on-time pattern

Best: May (89.2%) · weakest: June (75.3%)

70%75%80%85%90% JanFebMarAprMayJunJulAugSepOctNovDec 82.9%

Strongest calendar month

May

89.2% on-time · ~43 flights/mo

Busiest calendar month

June

~65 flights/mo avg

Weakest calendar month

June

75.3% on-time · ~65 flights/mo

Cancellation Rate

1.9%

27 of 1,393 flights

Diversion Rate

0.4%

5 of 1,393 flights

Explore origin & destination

On-time and delay data for the airports this route connects.

SLC - Salt Lake City

Full on-time, delay-cause, and seasonal performance for Salt Lake City, UT.

SLC on-time profile

PHL - Philadelphia

Full on-time, delay-cause, and seasonal performance for Philadelphia, PA.

PHL on-time profile

Compare the two airports

See SLC and PHL side by side on delays, cancellations, and reliability.

Compare SLC vs PHL

Origin-hub reliability standing

Mid-pack among SLC departures

From SLC, this corridor sits with 31 other 75–85% on-time routes out of 85 tracked departures, not the hub's reliability leaders (54 at ≥85%) and not the softest ( 0 below 75%). Destination: Philadelphia · fleet on-time rank #2327 of 4927.

What the Data Says About SLC to PHL

Bureau of Transportation Statistics records show Salt Lake City to Philadelphia (SLC to PHL) running a 82.1% on-time rate over 3,000 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 66.1 minutes. The 1,927-mile corridor is served by 3 carriers, and over the last 24 months 1.9% of 1,393 flights were cancelled, 0.4% diverted.

The monthly split is wide on this route: Aug 2025 posted the strongest performance at 90% on-time, while Jul 2024 came in at just 74% - a 15-point swing worth factoring into travel timing.

On the multi-year calendar, SLC–PHL peaks in May at 89.2% on-time while June carries the heaviest traffic (~65 flights per month) ; the softest month is June at 75.3%, a 13.9-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does SLC to PHL rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, SLC to PHL ranks #3297 of 4927 tracked domestic routes by total flights (most flights = #1). That ordinal matches our busiest-routes listing (total_flights DESC). See /methodology#corpus-placement for the exact sort basis.
How often are flights delayed from SLC to PHL? ▼
Flights from Salt Lake City to Philadelphia have a 82.1% on-time rate based on 3,000 flights. The average delay is 66.1 minutes. The best recent month was Aug 2025 with 90% on-time.
What is the cancellation rate for SLC to PHL? ▼
Over the last 24 months, 1.9% of flights on this route were cancelled (27 of 1,393 flights) and 0.4% were diverted.
How far is the flight from SLC to PHL? ▼
The flight distance from Salt Lake City (SLC) to Philadelphia (PHL) is approximately 1,927 miles. This route is served by 3 carriers.
When is the best time to fly from SLC to PHL? ▼
The best recent month for on-time performance was Aug 2025 (90% on-time). The worst was Jul 2024 (74% on-time). Consider booking during months with historically better performance.

Airports on this route

SLC Airport

Salt Lake City
PHL Airport

Philadelphia
Data source

Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.

Read our methodology - how this data is sourced, computed, and verified.

Using SLC–PHL data

SLC–PHL runs 3.1 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.

  • Compare SLC and PHL airport profiles: delay causes and top routes differ even on the same corridor. SLC airport
  • If your dates flex, May (89.2% on-time) beats June (75.3%) on this corridor. Seasonal chart
  • 4 other routes post a similar 82.1% on-time rate; compare before you commit to this pairing. Similar routes

On-time rate reflects the BTS historical average across all reporting carriers on this origin–destination pair, not any single flight or booking recommendation.

Data sourced from U.S. Department of Transportation Bureau of Transportation Statistics (BTS) On-Time Performance data. See our methodology for details. Retrieved and formatted by PlainFlights

Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.