BTS DATA COMPLETE THROUGH JUNE 2026HISTORICAL ODDS · NOT LIVE FLIGHT STATUS
DelayOddsKnow the route before you book
SLCBOS

Salt Lake City, UT (SLC) to Boston, MA (BOS) flight delay odds

Historically, 80.7% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 1,256 flights.

HISTORICAL ROUTE SIGNALGenerally reliable
80.7%arrived on time
10.7%30+ min late
1.8%cancelled
1,256scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late6.2%all scheduled flights
120+ minutes late2.7%all scheduled flights
Diverted0.1%did not reach as scheduled
Average arrival+0.3 mincompleted flights

When is this route most reliable?

The same route can behave differently through the day. These are scheduled departure windows, not actual departure times. Small time windows with fewer than 40 flights are withheld.

Departure windowFlightsOn time30+ minCancelled
Late morning36580.8%11.5%1.1%
Evening36476.1%14.3%1.1%
Night48485.1%7.0%2.5%

Weekday comparison

Day-of-week results use at least 30 scheduled flights per row. Look for broad patterns, not tiny percentage differences.

DayFlightsOn time30+ minCancelled
Monday18478.8%12.0%4.3%
Tuesday16880.4%10.7%1.8%
Wednesday16185.7%9.3%0.0%
Thursday17976.0%12.8%0.6%
Friday18179.6%9.9%1.7%
Saturday19988.4%6.0%0.0%
Sunday18475.5%14.1%3.8%

Airline comparison

Marketing-carrier results make codeshare flights easier to compare as travelers buy them. Dedicated route-airline reports require at least 160 flights.

AirlineFlightsOn time30+ minCancelled
Delta Air Lines1,08382.2%9.7%1.3%
JetBlue Airways17371.1%16.8%4.6%

Monthly trend

Month-by-month results show whether a twelve-month average hides an unusual period.

MonthFlightsOn time30+ minCancelled
July 202512375.6%15.4%1.6%
August 202511684.5%6.9%0.9%
September 20259278.3%16.3%0.0%
October 20259275.0%18.5%0.0%
November 20259788.7%8.2%0.0%
December 202510779.4%12.1%1.9%
January 20269277.2%5.4%7.6%
February 202611074.5%10.0%8.2%
March 202613280.3%11.4%0.0%
April 20269280.4%6.5%0.0%
May 20269391.4%5.4%1.1%
June 202611083.6%10.9%0.0%

What drove reported delay minutes?

BTS cause minutes are reported for qualifying delayed flights. These shares describe recorded delay minutes—not the chance that a particular cause will affect your next flight.

Airline32.9%
Late aircraft36.0%
National airspace29.9%
Weather1.2%
Security0.0%
This is historical evidence, not a forecast.

Weather, schedules and operations change. For a trip you have already booked, use the airline or airport for live status.