DEN to BOS flight delays & on-time performance
Nonstop flights from Denver International Airport to Boston Logan International Airport · 1,754 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at DEN or BOS right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Denver (DEN) to Boston (BOS) arrived on time 71% of the time in Aug 2025 – Jul 2026, worse than the 78% national average.
- 1.4% were cancelled, and 12% arrived an hour or more late.
- United Airlines was the most punctual airline here (77% on time); Southwest Airlines was the least (58%).
- Departures scheduled around 7am did best (94% on time); around 7pm did worst (38%).
- Saturday was the most reliable day to fly (80% on time) and Monday the least (66%).
- The largest source of delay minutes was air traffic control & airport congestion (43%).
Which airline is most on time from DEN to BOS?
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 |
|---|---|---|---|---|---|
| United Airlines | 77% | 0.9% | 17 min | 8.6% | 1,900 |
| Delta Air Lines | 74% | 1.3% | 16 min | 9.3% | 372 |
| JetBlue | 68% | 3.1% | 28 min | 16.0% | 686 |
| Southwest Airlines | 58% | 1.1% | 28 min | 16.1% | 914 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 7am94%161 flights
- 8am84%248 flights
- 9am75%482 flights
- 10am69%233 flights
- 11am74%419 flights
- 12pm66%59 flights
- 1pm62%269 flights
- 2pm64%465 flights
- 3pm60%140 flights
- 4pm70%174 flights
- 5pm70%486 flights
- 6pm41%93 flights
- 7pm38%120 flights
- 10pm72%99 flights
- 11pm82%410 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday66%2.8% cancelled
- Tuesday68%1.5% cancelled
- Wednesday71%0.0% cancelled
- Thursday69%0.3% cancelled
- Friday73%0.7% cancelled
- Saturday80%0.6% cancelled
- Sunday70%3.4% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Air traffic control & airport congestion43%
- Late-arriving aircraft36%
- Airline (crew, maintenance, cleaning, fueling)20%
- Extreme weather1%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather72%
- Airline (crew, maintenance, cleaning, fueling)17%
- Air traffic control & airport congestion11%
- Security0%
DEN to BOS: common questions
- How often are DEN to BOS flights on time?
- 71% 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 Denver to Boston cancelled?
- 1.4% of scheduled flights were cancelled (53 of 3,872).
- How long are typical delays?
- Across all flights the average arrival delay was 21 min (early arrivals count as zero). Flights that were late arrived 70 min behind schedule on average, and 11.7% of flights were an hour or more late.
- How long is taxi time at DEN?
- Flights on this route spent 20 min taxiing from the gate to takeoff on average.
Related routes
Return trip: BOS to DEN — 77% on time
More flights from Denver
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: DEN → BOS, nonstop flights by US airlines that report to the DOT. How we calculate this.