BOS to DEN flight delays & on-time performance
Nonstop flights from Boston Logan International Airport to Denver International Airport · 1,754 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at BOS or DEN right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Boston (BOS) to Denver (DEN) arrived on time 77% of the time in Aug 2025 – Jul 2026, worse than the 78% national average.
- 1.3% were cancelled, and 8% arrived an hour or more late.
- Delta Air Lines was the most punctual airline here (84% on time); Southwest Airlines was the least (66%).
- Departures scheduled around 6am did best (90% on time); around 5pm did worst (40%).
- Wednesday was the most reliable day to fly (79% on time) and Thursday the least (74%).
- The largest source of delay minutes was late-arriving aircraft (46%).
Which airline is most on time from BOS to DEN?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| Delta Air Lines | 84% | 1.6% | 9 min | 3.3% | 372 |
| United Airlines | 83% | 1.1% | 12 min | 5.8% | 1,897 |
| JetBlue | 71% | 2.5% | 19 min | 11.1% | 685 |
| Southwest Airlines | 66% | 1.0% | 20 min | 10.5% | 914 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 5am88%138 flights
- 6am90%246 flights
- 7am88%790 flights
- 9am88%358 flights
- 10am82%146 flights
- 11am85%396 flights
- 12pm74%143 flights
- 1pm74%75 flights
- 2pm68%61 flights
- 3pm84%356 flights
- 4pm67%413 flights
- 5pm40%216 flights
- 6pm63%155 flights
- 7pm49%218 flights
- 8pm67%157 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday79%3.3% cancelled
- Tuesday78%1.9% cancelled
- Wednesday79%0.9% cancelled
- Thursday74%0.4% cancelled
- Friday75%0.8% cancelled
- Saturday79%0.8% cancelled
- Sunday75%1.2% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Late-arriving aircraft46%
- Airline (crew, maintenance, cleaning, fueling)26%
- Air traffic control & airport congestion26%
- Extreme weather2%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather62%
- Airline (crew, maintenance, cleaning, fueling)25%
- Air traffic control & airport congestion13%
- Security0%
BOS to DEN: common questions
- How often are BOS to DEN flights on time?
- 77% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Boston to Denver cancelled?
- 1.3% of scheduled flights were cancelled (52 of 3,868).
- How long are typical delays?
- Across all flights the average arrival delay was 15 min (early arrivals count as zero). Flights that were late arrived 60 min behind schedule on average, and 7.6% of flights were an hour or more late.
- How long is taxi time at BOS?
- Flights on this route spent 19 min taxiing from the gate to takeoff on average.
Related routes
Return trip: DEN to BOS — 71% on time
More flights from Boston
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: BOS → DEN, nonstop flights by US airlines that report to the DOT. How we calculate this.