Route Reliability
San Francisco → Boston
SFO–BOS · 2,704 miles · San Francisco International Airport to Boston Logan International Airport
- 79%
- Arrive within 15 minutes
- 6 min
- Average arrival delay
- 1.3%
- Cancelled
- 4,610
- Flights in the data
Data through May 2026.
Who flies it best
Ranked by on-time arrivals. Historical results, not predictions.
- 1.United Airlines79%1,815 flights
- 2.Delta Air Lines79%883 flights
- 3.JetBlue Airways79%1,617 flights
- 4.Alaska Airlines79%294 flights
Not enough history to rank: Southwest Airlines (1 flights). We rank airlines only after 100 flights on the route.
What the data says
The 6–9 AM departure wins.
SFO–BOS flights departing between 6–9 AM arrived on time 86% of the time, versus 66% between 9 AM–12 PM.
Skip Thursday if you can.
SFO–BOS flights arrived on time 85% of the time on Saturdays. On Thursdays: 74%.
Not much between United Airlines and Alaska Airlines.
On this route they all land within 79% to 79% on time. Pick on schedule and price.
Slipping a little lately.
SFO–BOS flights arrived on time 77% of the time over the last three months in the data, compared with 83% in the three months before that.
Best historical flights
Ranked by on-time arrivals, minimum 100 flights. Past performance, not a promise.
Top flights by on-time rate
More flights on this route
The breakdown
- Mon78%(679 flights)
- Tue81%(635 flights)
- Wed80%(639 flights)
- Thu74%(683 flights)
- Fri78%(689 flights)
- Sat85%(539 flights)
- Sun79%(680 flights)
- 6–9 AM86%(1414 flights)
- 9 AM–12 PM66%(607 flights)
- 12–3 PM74%(813 flights)
- 3–6 PM82%(507 flights)
- 6–9 PM85%(171 flights)
- 9 PM–12 AM78%(1032 flights)
Jun 82% → May 76% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 82% | 438 |
| July 2025 | 77% | 449 |
| August 2025 | 87% | 429 |
| September 2025 | 73% | 408 |
| October 2025 | 71% | 422 |
| November 2025 | 79% | 349 |
| December 2025 | 83% | 354 |
| January 2026 | 82% | 296 |
| February 2026 | 85% | 260 |
| March 2026 | 79% | 321 |
| April 2026 | 78% | 379 |
| May 2026 | 76% | 439 |
Same trip, other airports
Keep nerding
Based on 4,610 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.