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Route Reliability

Boston → San Francisco

BOS–SFO · 2,704 miles · Boston Logan International Airport to San Francisco International Airport

78
Usually Fine
WanderNerd Reliability Score
76%
Arrive within 15 minutes
5 min
Average arrival delay
1.1%
Cancelled
4,612
Flights in the data

Data through May 2026.

Who flies it best

Ranked by on-time arrivals. Historical results, not predictions.

  1. 1.United Airlines80%1,816 flights
  2. 2.Delta Air Lines75%882 flights
  3. 3.JetBlue Airways74%1,619 flights
  4. 4.Alaska Airlines64%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

Morning-you made the right choice.

BOS–SFO flights departing between 3–6 AM arrived on time 90% of the time, versus 62% between 6–9 PM.

Skip Thursday if you can.

BOS–SFO flights arrived on time 81% of the time on Tuesdays. On Thursdays: 72%.

United Airlines has a clear lead on this route.

United Airlines arrived on time 80% of the time on this route; Alaska Airlines managed 64%.

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

On-time by weekday
  • Mon74%(669 flights)
  • Tue81%(631 flights)
  • Wed78%(635 flights)
  • Thu72%(680 flights)
  • Fri75%(694 flights)
  • Sat78%(544 flights)
  • Sun74%(693 flights)
On-time by departure window
  • 3–6 AM90%(52 flights)
  • 6–9 AM85%(1418 flights)
  • 9 AM–12 PM84%(700 flights)
  • 12–3 PM83%(353 flights)
  • 3–6 PM69%(841 flights)
  • 6–9 PM62%(1099 flights)
  • 9 PM–12 AM70%(83 flights)
On-time trend by month
70%
May

Jun 83% → May 70% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202583%438
July 202575%447
August 202585%430
September 202582%408
October 202576%424
November 202575%350
December 202567%349
January 202674%298
February 202675%261
March 202677%323
April 202670%379
May 202670%439

Same trip, other airports

Keep nerding

Based on 4,612 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.