DEN to BOS flight delays
Denver, CO (DEN) Boston, MA (BOS) · 1,754 miles
374 flights · March 2025 – August 2026 · US Bureau of Transportation Statistics
66.4%
Arrived on time
Within 15 minutes of schedule
0.27%
Cancelled
Share of scheduled flights
70 min
When late, late by
Average across delayed arrivals
24 min
Delay per flight
Averaged over every flight flown
What the record says about this route
This is a late route. Flights from Denver to Boston miss their scheduled arrival often enough that a tight connection at the far end is a connection at risk.
Only United Airlines flies this route in the published record, so there is no choice to weigh — the route's figures and the airline's are the same figures.
This is a thin route — 374 flights across the whole period. On a route this infrequent a cancellation is far more costly than the rate suggests, because the next departure may not be the same day.
Which airline should you fly on this route?
Over March 2025 – August 2026, United Airlines arrived on time most often on DEN to BOS.
Every airline on DEN 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 |
|---|---|---|---|---|---|
| United Airlines | 180 | 78.21% | 0% | 66 min | C |
| Southwest Airlines | 87 | 50.57% | 0% | 60 min | — |
| JetBlue Airways | 77 | 55.26% | 1.3% | 93 min | — |
| Delta Air Lines | 30 | 70% | 0% | 43 min | — |
The return leg
BOS to DEN Boston back to Denver 71% on time COther routes from Denver
Common questions
Are flights from Denver to Boston usually delayed?
66.4% of flights on the DEN to BOS route arrived within 15 minutes of schedule, so roughly 3 in every ten arrived late. That is worse than the average route in this record.
Which airlines fly from Denver to Boston?
Only United Airlines appears in the published record on this route, with 180 flights and 78.21% arriving on time.
How often are DEN to BOS flights cancelled?
0.27% of scheduled flights did not operate — about 3 in every thousand. That is in the normal range.
When DEN to BOS flights are late, how late are they?
About 70 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 DEN to BOS during March 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 →