Logan (BOS) Flight Delays: Rate, Worst Hours and Live Risk
Logan (BOS) is ranked 13 of 22 for delays among DelayGuard's guide airports (1 is the highest rate): 22.4% of flights departing BOS arrived 15 or more minutes late across 418,699 flights, January 2023 to December 2025. JetBlue Airways operated 29.3% of those departures, with a 26.5% delay rate of its own. The worst scheduled departure hours are 11 PM (40.4%) and 8 PM (35.7%); 5 AM is the best at 8.5%. 1.56% of scheduled BOS departures were cancelled in 2024 to 2025.
These figures are historical US domestic rates, not a forecast for one departure. Use the free delay prediction for your trip before you book.
Delay window: January 2023 to December 2025. Cancellation window: 2024 to 2025. Last updated: 2026-10-18. Delayed means a flight arrived 15 or more minutes after its scheduled arrival, the BTS and DOT on-time standard. Cancelled and diverted flights are excluded from delay rates. Historical BTS figures are separate from DelayGuard's per-flight model probability and from live FAA, weather and ground-delay status.
Layover buffer
Chance an inbound arrival is 45+ min late at BOS: 12.90%.
54,063 of 419,019 arrivals, January 2023 to December 2025. Not a missed-connection rate.
Flight delays today at BOS
FAA now: No FAA program
Tomorrow: Typical
October delay rate: 18.9%
FAA now is the current National Airspace System program.
Historical delay rate (15+ min late) at BOS
Sample size: 418,699 flights, window: January 2023 to December 2025. Delay rate 22.4%. Source: Bureau of Transportation Statistics (BTS). Cancellation rate 1.56% of 286,349 scheduled flights, 2024 to 2025.
Why BOS runs the way it does
No single carrier dominates BOS. The largest carriers in this window, by departures, are JetBlue Airways (29.3%), Republic Airways (18.9%) and Delta Air Lines (18.3%), so the airport's record reflects several operations rather than one hub schedule.
BOS delays peak in July (30.6%), June (25.3%) and August (24.4%) and are lowest in November (16.7%). That shape is consistent with the summer thunderstorm season, when convective weather builds through the afternoon and slows arrivals and departures.
Delays build through the day: 12.4% of flights scheduled before 8 AM ran late against 35.0% after 8 PM. That is the pattern BTS describes as late-arriving aircraft, where a previous flight with the same aircraft arriving late makes the next departure late.
Best and worst times to fly from BOS
| Hour | Delayed 15+ min | Flights |
|---|---|---|
| 5 AM | 8.5% | 14,026 |
| 6 AM | 11.4% | 35,129 |
| 7 AM | 14.6% | 41,524 |
| 8 AM | 15.3% | 33,883 |
| 9 AM | 14.7% | 26,517 |
| 10 AM | 17.5% | 22,711 |
| 11 AM | 17.6% | 22,914 |
| 12 PM | 19.8% | 21,777 |
| 1 PM | 21.6% | 19,558 |
| 2 PM | 24.2% | 21,076 |
| 3 PM | 28.3% | 25,950 |
| 4 PM | 32.5% | 25,934 |
| 5 PM | 32.1% | 28,513 |
| 6 PM | 32.9% | 26,578 |
| 7 PM | 33.4% | 23,177 |
| 8 PM | 35.7% | 20,866 |
| 9 PM | 34.3% | 6,835 |
| 10 PM | 29.2% | 1,589 |
| 11 PM | 40.4% | 141 |
BOS delays and cancellations by month
| Month | Delayed 15+ min | Flights | Cancelled |
|---|---|---|---|
| Jan | 23.0% | 30,816 | 2.78% |
| Feb | 23.0% | 30,297 | 1.82% |
| Mar | 19.5% | 35,484 | 0.59% |
| Apr | 20.2% | 35,654 | 0.67% |
| May | 20.7% | 37,292 | 0.76% |
| Jun | 25.3% | 35,921 | 1.43% |
| Jul | 30.6% | 36,304 | 3.46% |
| Aug | 24.4% | 37,154 | 2.38% |
| Sep | 22.0% | 35,021 | 0.86% |
| Oct | 18.9% | 37,676 | 1.13% |
| Nov | 16.7% | 33,897 | 1.39% |
| Dec | 24.3% | 33,183 | 1.55% |
Airlines at BOS
| Airline | Share of departures | Delayed 15+ min | Flights | Cancelled |
|---|---|---|---|---|
| JetBlue Airways | 29.3% | 26.5% | 122,577 | 1.44% |
| Republic Airways | 18.9% | 17.3% | 79,051 | 2.28% |
| Delta Air Lines | 18.3% | 21.2% | 76,567 | 0.96% |
| American Airlines | 11.5% | 20.7% | 48,227 | 1.50% |
| United Airlines | 8.8% | 19.5% | 36,788 | 1.41% |
| Southwest Airlines | 4.6% | 23.0% | 19,452 | 0.97% |
| Spirit Airlines (ceased 2 May 2026) | 3.7% | 30.7% | 15,474 | 2.77% |
| Alaska Airlines | 1.8% | 25.0% | 7,533 | 1.25% |
| Envoy Air | 1.3% | 22.5% | 5,534 | 1.50% |
| Frontier Airlines | 0.8% | 28.6% | 3,201 | 2.46% |
Regional operators are reported separately from the airline brands they fly for.
Routes from BOS
| Route | Delayed 15+ min | Flights | Cancelled | Link |
|---|---|---|---|---|
| BOS to DCA | 20.9% | 27,830 | 2.35% | Predict |
| BOS to LGA | 18.2% | 22,240 | 3.20% | Predict |
| BOS to ORD | 22.5% | 20,086 | 1.45% | Route page |
| BOS to JFK | 22.3% | 17,065 | 2.66% | Route page |
| BOS to ATL | 21.4% | 14,883 | 1.11% | Route page |
| BOS to PHL | 20.8% | 14,534 | 1.84% | Predict |
| BOS to MCO | 30.4% | 14,248 | 1.73% | Route page |
| BOS to CLT | 18.8% | 13,849 | 1.65% | Route page |
| BOS to LAX | 22.2% | 13,588 | 0.42% | Route page |
| BOS to SFO | 23.3% | 13,514 | 0.72% | Route page |
| BOS to EWR | 23.2% | 12,005 | 3.66% | Route page |
| BOS to BWI | 20.0% | 12,003 | 1.63% | Predict |
| BOS to DFW | 24.4% | 11,228 | 1.70% | Route page |
| BOS to MIA | 22.5% | 11,056 | 1.36% | Route page |
| BOS to DEN | 21.4% | 10,968 | 0.91% | Route page |
- Logan Runway 9-27 closure, October 2026
- Summer thunderstorm delays: which airports suffer most
- Northeast winter flights: what the data shows
- Thanksgiving and Christmas 2026 flight delay guide
- US airline cancellation rates
Questions
- How often are flights delayed at BOS?
- 22.4% of flights departing BOS arrived 15 or more minutes late across 418,699 flights, January 2023 to December 2025 (BTS). Across all US domestic flights in the data, the rate is 21.2%.
- What is the best time to fly from BOS?
- Early departures run best. 5 AM flights ran 8.5% late (14,026 flights), 6 AM flights ran 11.4% late (35,129 flights) and 7 AM flights ran 14.6% late (41,524 flights). The worst hours are 11 PM (40.4%), 8 PM (35.7%) and 9 PM (34.3%).
- Which month is worst for delays at BOS?
- July has the highest delay rate at 30.6%. November is the lowest at 16.7%.
- Which airline has the best on-time record at BOS?
- Among carriers still flying with at least 5,000 flights from BOS, Republic Airways has the lowest delay rate at 17.3% (79,051 flights). JetBlue Airways is highest at 26.5%. Regional operators such as SkyWest are reported separately from the airline brands they fly for.
- How often are BOS flights cancelled?
- 1.56% of 286,349 scheduled departures from BOS were cancelled in 2024 to 2025. The US figure over the same period is 1.41%. See the full ranking on the cancellation rates page.
- Does DelayGuard show live delays at BOS?
- Yes. The live module on this page shows DelayGuard's hourly risk score and any active FAA ground stop or ground delay program. It is separate from the historical BTS figures above. For a specific flight, the predictor gives a model probability that combines history, weather and FAA data.
- Why does BOS have delays?
- No single carrier dominates BOS. The largest carriers in this window, by departures, are JetBlue Airways (29.3%), Republic Airways (18.9%) and Delta Air Lines (18.3%), so the airport's record reflects several operations rather than one hub schedule. BOS delays peak in July (30.6%), June (25.3%) and August (24.4%) and are lowest in November (16.7%). That shape is consistent with the summer thunderstorm season, when convective weather builds through the afternoon and slows arrivals and departures.