Boston (BOS) to Phoenix (PHX): On-Time Performance
Data through July 2026
Boston (BOS) to Phoenix (PHX) effectively runs on two schedules. In September 2024, 89% of arrivals were on time; in February 2025 that fell to 65% — a 24-point seasonal swing. Across the full period the route averages 78% on-time against a national 78%. Morning departures also hold up better than evening ones (85% vs 66%), which matters most in the rough months.
- On-time
- 78%
- arrived <15 min late
- Avg delay
- 17 min
- completed flights
- Cancelled
- 1.1%
- Flights/day
- 5.5
- last 12 months
- Duration
- 5h 52m
- scheduled
- Distance
- 2,300 mi
Best airline from BOS to PHX
3 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| American Airlinesmost reliable | 82% | 16 min | 1.0% | 2,767 |
| JetBlue Airways | 73% | 18 min | 1.1% | 797 |
| Delta Air Lines | 69% | 19 min | 1.4% | 838 |
Monthly on-time trend
Best time to fly from BOS to PHX
Aim for departures around 6 a.m. (90% on-time); avoid 8 p.m. departures (51%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 78% | 17 min |
| Tuesdaybest | 81% | 14 min |
| Wednesday | 79% | 19 min |
| Thursday | 77% | 16 min |
| Friday | 74% | 19 min |
| Saturday | 80% | 14 min |
| Sunday | 76% | 19 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft36%
- Airline operations38%
- National airspace system22%
- Weather4%
Frequently asked questions
- How often are flights from BOS to PHX delayed?
- 22% of BOS–PHX flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 17 minutes.
- Which airline is most reliable from BOS to PHX?
- American Airlines has the best on-time record on this route at 82%, based on 2,767 flights. 3 airlines flew BOS–PHX frequently enough to compare in this period.
- What is the best time of day to fly from BOS to PHX?
- Departures around 6 a.m. have the best record (90% on-time), while departures around 8 p.m. have the worst (51%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from BOS to PHX?
- The scheduled BOS–PHX flight time averages 5h 52m over 2,300 miles. Actual arrival times vary — flights on this route land 15+ minutes late 22% of the time.
- How often are BOS to PHX flights cancelled?
- 1.1% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from BOS to PHX?
- February 2025 was the roughest month in this dataset, with only 65% of arrivals on time. The best was September 2024 at 89%. If your dates are flexible, that 24-point gap is worth planning around.
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Based on 4,402 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.