75% of flights from Los Angeles to Boston arrived on time over the past 12 months. That is worse than the typical U.S. route. The 11 p.m. departures ran on time 87% of the time; the 10 a.m. ones 60%. Most reliable airline: United Airlines (84%). 11% of flights arrived more than an hour late or not at all.
How late?
The on-time rate treats a flight 20 minutes late the same as one 5 hours late. Here's the split for LAX → BOS: when a flight was late, it was under 45 minutes late 50% of the time. About 1 in 11 flights landed an hour or more late, and 1 in 46 three hours or more; 1.8% were cancelled outright.
- On time or early75%
- 15–30 min late7.9%
- 30–60 min late6.3%
- 1–2 hours late5.1%
- 2–3 hours late1.8%
- 3+ hours late2.2%
- Diverted0.1%
- Cancelled1.8%
Share of all 4,797 scheduled flights, past 12 months, by arrival time against schedule.
By airline
| Airline | Flights | On time | Cancelled | Typical arrival | 1h+ late | Avg when late | Operated by |
|---|---|---|---|---|---|---|---|
| JetBlue | 1,642 | 72% | 2.1% | −5 min | 8.7% | +67 min | JetBlue |
| Delta Air Lines | 1,240 | 74% | 2.2% | −3 min | 9.9% | +89 min | Delta Air Lines |
| American Airlines | 1,184 | 73% | 1.6% | −5 min | 11.3% | +94 min | American Airlines |
| United Airlines | 731 | 84% | 1.0% | −13 min | 5.1% | +71 min | United Airlines |
Airline = the name on the ticket. Regional flights (e.g. "Delta Connection") count under the ticketing airline, and the operator is listed.
Best time of day to fly
On-time rate by scheduled departure hour (local time at LAX). Delays build through the day as late planes knock on, so early flights usually do best.
By airline and hour
| Departs | JetBlue | Delta Air Lines | American Airlines | United Airlines |
|---|---|---|---|---|
| 6 a.m. | 85% | 86% | — | — |
| 7 a.m. | 89% | 74% | — | — |
| 8 a.m. | 82% | — | 74% | 81% |
| 9 a.m. | 62% | — | — | — |
| 10 a.m. | 64% | 57% | — | — |
| noon | — | — | 65% | — |
| 1 p.m. | 66% | 71% | — | — |
| 3 p.m. | — | 70% | — | — |
| 9 p.m. | 85% | 82% | — | — |
| 10 p.m. | 62% | — | 77% | 88% |
| 11 p.m. | — | — | — | 93% |
Last flight of the day
On LAX → BOS, each airline's last flight of the day was cancelled 1.7% of the time, against 1.8% for its earlier flights, about the same. It arrived 3+ hours late 1.4% of the time (earlier flights: 2.5%). It matters more than the numbers suggest. Miss an earlier flight and there's another one that evening; miss the last one and you're usually waiting until morning.
| Airline | Last departure | Last: cancelled | Last: 3h+ late | Earlier: cancelled | Next morning |
|---|---|---|---|---|---|
| American Airlines | 10:59 p.m. | 0.8% | 1.9% | 1.9% | first flight 8:00 a.m. |
| JetBlue | 10:12 p.m. | 2.8% | 1.9% | 1.9% | first flight 6:00 a.m. |
| Delta Air Lines | 9:00 p.m. | 2.2% | 1.6% | 2.2% | first flight 6:40 a.m. |
| United Airlines | 11:14 p.m. | 1.1% | 0.0% | 0.5% | first flight 8:35 a.m. |
Last flight = the airline's last scheduled departure on this route that day, on days it flies the route at least twice; past 12 months. Times are typical scheduled times over the latest three months.
By month
Each calendar month pooled over 2023–2026. Best: November (84%). Worst: July (75%).
By day of week
| Day | Flights | On time | Cancelled |
|---|---|---|---|
| Monday | 723 | 72% | 3.0% |
| Tuesday | 679 | 77% | 2.1% |
| Wednesday | 681 | 75% | 0.7% |
| Thursday | 701 | 73% | 0.9% |
| Friday | 709 | 79% | 0.9% |
| Saturday | 594 | 79% | 0.8% |
| Sunday | 710 | 70% | 4.1% |
Why flights were late
Share of delay minutes on flights 15+ minutes late, as reported to BTS by the airlines.
Cancellations: weather 44 · airline 36 · air traffic/airport 7
Month by month
Flight numbers on this route
Regular flights with at least 120 scheduled trips in the past year. Sorted by departure time.
| Flight | Departs | Flights | On time | Cancelled | Typical arrival | Operated by |
|---|---|---|---|---|---|---|
| B6 888 | 6:00 a.m. | 137 | 86% | 0.7% | −7 min | JetBlue |
| DL 639 | 7:55 a.m. | 365 | 79% | 3.0% | −5 min | Delta Air Lines |
| AA 12 | 8:00 a.m. | 364 | 78% | 1.4% | −7 min | American Airlines |
| B6 288 | 8:00 a.m. | 330 | 66% | 1.2% | −1 min | JetBlue |
| UA 1783 | 8:20 a.m. | 365 | 81% | 0.8% | −11 min | United Airlines |
| B6 1388 | 10:59 a.m. | 164 | 67% | 2.4% | −2 min | JetBlue |
| AA 382 | 12:55 p.m. | 125 | 70% | 2.4% | −7 min | American Airlines |
| DL 437 | 1:00 p.m. | 342 | 66% | 1.8% | −1 min | Delta Air Lines |
| B6 188 | 1:55 p.m. | 128 | 66% | 1.6% | −2 min | JetBlue |
| DL 507 | 9:00 p.m. | 295 | 82% | 2.7% | −5 min | Delta Air Lines |
| B6 988 | 9:45 p.m. | 342 | 76% | 2.6% | −8 min | JetBlue |
| AA 2453 | 10:00 p.m. | 354 | 78% | 0.9% | −5 min | American Airlines |
| UA 2210 | 11:59 p.m. | 348 | 90% | 1.1% | −15 min | United Airlines |
Worst days in the past year
| Date | Flights | On time | Cancelled |
|---|---|---|---|
| Jan 25, 2026 | 13 | 0% | 13 |
| Feb 23, 2026 | 13 | 0% | 12 |
| Mar 16, 2026 | 13 | 15% | 1 |
| Oct 30, 2025 | 12 | 17% | 1 |
| Jan 27, 2026 | 11 | 27% | 2 |
Questions
How often are flights from LAX to BOS on time?
75% of 4,797 scheduled flights from Los Angeles, CA to Boston, MA arrived within 15 minutes of schedule between September 2025 and August 2026. 1.8% were cancelled.
What is the best time of day to fly LAX to BOS?
Flights scheduled to leave at 11 p.m. were the most reliable (87% on time). The 10 a.m. departures were the least (60%).
Which airline is most on time from LAX to BOS?
United Airlines: 84% of its 731 flights on the route arrived on time. JetBlue: 72%. Delta Air Lines: 74%. American Airlines: 73%.
What month has the most delays from LAX to BOS?
July (75% on time). The best month is November (84%), over 2023–2026.
Is the last flight of the day from LAX to BOS more likely to be cancelled?
Not much. Each airline's last LAX–BOS flight of the day was cancelled 1.7% of the time over the past year, against 1.8% for its earlier flights. If the last flight is cancelled, the next one is usually the following morning.
Related
- BOS → LAX (return)
- Los Angeles LAX (LAX) delays by hour
- Flights into Boston Logan (BOS)
- JetBlue on-time record
- Delta Air Lines on-time record
- American Airlines on-time record
- United Airlines on-time record
- Connecting off this flight? Check the risk
Domestic flights by the airlines that report to the U.S. DOT, plus their regional partners. "On time" means arriving less than 15 minutes after schedule; cancelled and diverted flights count as not on time. Past performance is a guide, not a forecast. Method.