My trip
Plan a trip
Tell FlyerIntel where and when you are flying. It will show how that route actually performs at that time of day and on that day of the week, what both airports are doing right now, and when to get to the airport.
SFO → BOS
San Francisco to Boston
Your slot
Add a date and a scheduled departure time above to see how your weekday and hour have done on this route.
Other times on SFO → BOS
Time of day
- 5–9 AM86.5%
- 9 AM–12 PM69.4%
- 12–3 PM73.3%
- 3–6 PM78.1%
- 6–9 PM81.4%
- 9 PM–5 AM76.8%
Day of week
- Monday76.1%
- Tuesday81.8%
- Wednesday80.6%
- Thursday73.2%
- Friday76.2%
- Saturday82.4%
- Sunday76.2%
Bars start below the lowest figure so a real gap is visible; read the percentage, not the bar length. A time with too few flights to score is left unscored rather than guessed at.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · History describes what has happened on this route. It is not a prediction about your flight. Full route profile →
Which flight
Every flight number on SFO → BOS with enough history to judge, most reliable first.
On this route, DL400 (usually 7:10 AM) has the best record: 90.4% on time and 1.40% cancelled over 784 flights, against 77.9% on time for SFO → BOS as a whole.
| Flight | Usually departs | On time | Cancelled |
|---|---|---|---|
| DL400Delta Air LinesLive map | 7:10 AM | 90.4% | 1.40% |
| UA2001United AirlinesLive map | 4:15 PM | 88.3% | 0.00% |
| B6434JetBlueLive map | 6:00 AM | 86.2% | 1.11% |
| UA796United AirlinesLive map | 9:25 PM | 86.1% | 0.42% |
| UA2647United AirlinesLive map chosen, below | 8:25 AM | 83.0% | 1.08% |
| UA1665United AirlinesLive map | 11:25 PM | 81.8% | 1.24% |
| UA1372United AirlinesLive map | 1:00 PM | 77.8% | 0.93% |
| B6734JetBlueLive map | 3:15 PM | 76.9% | 1.60% |
| B61734JetBlueLive map | 12:20 PM | 74.9% | 1.04% |
| B6834JetBlueLive map | 10:56 AM | 70.6% | 0.00% |
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · Showing 10 of 12 flight numbers. “Usually departs” is the scheduled time each flight number most often had over the period; airlines retime flights, so confirm the time on your booking. Flight numbers with fewer than 90 operations on this route are left out. This is history, not a forecast for your flight.
Where UA2647 is right now
A live reading for one flight, only if you ask for it. It is not part of the planning figures above.
Ask for the position of UA2647 right now, if receivers on the ground are hearing it. Nothing is requested until you press the button.
When to get to the airport
A starting point for SFO, not a promise about your day.
Add your departure time above for clock times.
How this was worked out
- FlyerIntel cannot currently obtain live security wait times for SFO, so this figure does not account for the queue on the day.
- It does not include your journey to the airport, parking, or a shuttle from a remote lot.
- International departures, and travel with children, checked pets or special assistance, need more time.
Both airports right now
Aviation weather is not currently a factor.
Minimal operational impact. Conditions are not a notable factor for operations right now.
UpdatedAviation weather is not currently a factor.
Minimal operational impact. Conditions are not a notable factor for operations right now.
UpdatedSource: NOAA Aviation Weather Center · Conditions describe the airfield, not your flight, and change quickly.
Who flies this route
Performance by the carrier that actually operates the flight.
| Carrier | Flights | On time | Cancelled | Median delay |
|---|---|---|---|---|
| United Airlines | 5,526 | 79.4% | 1.01% | -8 min |
| JetBlue | 5,054 | 76.1% | 1.07% | -7 min |
| Delta Air Lines | 2,529 | 77.3% | 1.03% | -5 min |
| Alaska Airlines | 1,117 | 79.1% | 1.07% | -6 min |