SLC to BOS flight delays
Salt Lake City, UT (SLC) Boston, MA (BOS) · 2,105 miles
1,256 flights · January 2025 – August 2026 · US Bureau of Transportation Statistics
82.16%
Arrived on time
Within 15 minutes of schedule
1.75%
Cancelled
Share of scheduled flights
61 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. Delta Air Lines arrived on time 8.8 points more often than JetBlue Airways 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 two directions do not behave alike. BOS to SLC arrives on time 6.8 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.
Flights from Salt Lake City to Boston keep to schedule more reliably than most. On a route this punctual the day you fly matters more than the airline you pick.
Which airline should you fly on this route?
Over January 2025 – August 2026, Delta Air Lines arrived on time most often on SLC to BOS. JetBlue Airways was late most often. Flights ran closest to schedule in May and worst in October.
Every airline on SLC to BOS
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 | 1,083 | 83.33% | 1.29% | 60 min | B |
| JetBlue Airways | 173 | 74.55% | 4.62% | 67 min | D |
Month by month
Share of flights that arrived within 15 minutes of schedule, by month flown.
The return leg
BOS to SLC Boston back to Salt Lake City 75.36% on time DOther routes from Salt Lake City
Common questions
Are flights from Salt Lake City to Boston usually delayed?
82.16% of flights on the SLC to BOS 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 Boston?
Delta Air Lines, at 83.33% on time across 1,083 flights. The least punctual on the route was JetBlue Airways at 74.55%.
How often are SLC to BOS flights cancelled?
1.75% of scheduled flights did not operate — about 18 in every thousand. That is in the normal range.
What is the best month to fly Salt Lake City to Boston?
May, when 92.4% of flights arrived on time. The worst was October at 75%.
When SLC to BOS flights are late, how late are they?
About 61 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 BOS 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 →