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Route · BOS → SLC · 2020–2025 BTS data

Boston to Salt Lake City

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), BOS to SLC (Boston to Salt Lake City) ranks #1897 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

81.8%
On-time
+2.8 pts
vs US avg
76 min
Delay when late
6,672
Flights
#1897 of 4927
Corpus placement

Cancelled

0.5%

Best Month

Feb 2024 90%

Worst Month

Jun 2024 64%

Distance

2,105 mi

Carriers

3

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 107 36 2 0 DL,B6
Nov 2025 97 17 0 0 B6,DL
Oct 2025 92 18 0 1 DL
Sep 2025 92 11 0 0 DL,B6
Aug 2025 116 18 0 2 B6,DL
Jul 2025 123 30 2 0 B6,DL
Jun 2025 109 23 0 0 B6,DL
May 2025 93 12 0 0 DL
Apr 2025 90 17 0 0 DL
Mar 2025 151 34 1 1 B6,DL
Feb 2025 96 25 0 1 B6,DL
Jan 2025 83 10 1 0 B6,DL
Dec 2024 88 23 0 0 B6,DL
Nov 2024 87 11 0 1 B6,DL
Oct 2024 112 11 1 0 DL,B6
Sep 2024 114 14 0 0 B6,DL
Aug 2024 124 32 0 0 B6,DL
Jul 2024 122 33 5 0 B6,DL
Jun 2024 120 43 0 0 B6,DL
May 2024 124 21 0 0 B6,DL
Apr 2024 120 25 1 0 B6,DL
Mar 2024 117 20 0 1 B6,DL
Feb 2024 84 8 0 0 B6,DL
Jan 2024 87 18 0 1 B6,DL

BOS–SLC seasonal on-time pattern

Best: September (89.6%) · weakest: December (73.3%)

70%75%80%85%90%95% JanFebMarAprMayJunJulAugSepOctNovDec 73.3%

Strongest calendar month

September

89.6% on-time · ~98 flights/mo

Busiest calendar month

July

~114 flights/mo avg

Weakest calendar month

December

73.3% on-time · ~84 flights/mo

Cancellation Rate

0.5%

13 of 2,548 flights

Diversion Rate

0.3%

8 of 2,548 flights

Explore origin & destination

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

BOS - Boston

Full on-time, delay-cause, and seasonal performance for Boston, MA.

BOS on-time profile

SLC - Salt Lake City

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

SLC on-time profile

Compare the two airports

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

Compare BOS vs SLC

Origin-hub reliability standing

Mid-pack among BOS departures

From BOS, this corridor sits with 49 other 75–85% on-time routes out of 60 tracked departures, not the hub's reliability leaders (6 at ≥85%) and not the softest ( 5 below 75%). Destination: Salt Lake City · fleet on-time rank #2425 of 4927.

What the Data Says About BOS to SLC

6,672 tracked flights put the BOS to SLC pairing (Boston to Salt Lake City) at a 81.8% on-time rate, squarely in line with the wider network. Delays that do occur run 75.7 minutes on average. Across the 2,105-mile route and its 3 carriers, the trailing 24 months show 0.5% cancelled and 0.3% diverted (2,548 flights sampled).

The monthly split is wide on this route: Feb 2024 posted the strongest performance at 90% on-time, while Jun 2024 came in at just 64% - a 26-point swing worth factoring into travel timing.

On the multi-year calendar, BOS–SLC peaks in September at 89.6% on-time while July carries the heaviest traffic (~114 flights per month) ; the softest month is December at 73.3%, a 16.3-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does BOS to SLC rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, BOS to SLC ranks #1897 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 BOS to SLC? ▼
Flights from Boston to Salt Lake City have a 81.8% on-time rate based on 6,672 flights. The average delay is 75.7 minutes. The best recent month was Feb 2024 with 90% on-time.
What is the cancellation rate for BOS to SLC? ▼
Over the last 24 months, 0.5% of flights on this route were cancelled (13 of 2,548 flights) and 0.3% were diverted.
How far is the flight from BOS to SLC? ▼
The flight distance from Boston (BOS) to Salt Lake City (SLC) is approximately 2,105 miles. This route is served by 3 carriers.
When is the best time to fly from BOS to SLC? ▼
The best recent month for on-time performance was Feb 2024 (90% on-time). The worst was Jun 2024 (64% on-time). Consider booking during months with historically better performance.

Airports on this route

BOS Airport

Boston
SLC Airport

Salt Lake City
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 BOS–SLC data

BOS–SLC is mid-pack at 81.8% on-time; month and carrier mix move more than the corridor headline.

  • Compare BOS and SLC airport profiles: delay causes and top routes differ even on the same corridor. BOS airport
  • If your dates flex, September (89.6% on-time) beats December (73.3%) on this corridor. Seasonal chart
  • 4 other routes post a similar 81.8% 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.