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Route Reliability

San Francisco → Seattle

SFO–SEA · 679 miles · San Francisco International Airport to Seattle–Tacoma International Airport

78
Usually Fine
WanderNerd Reliability Score
75%
Arrive within 15 minutes
7 min
Average arrival delay
1.2%
Cancelled
6,771
Flights in the data

Data through May 2026.

Who flies it best

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

  1. 1.Delta Air Lines80%1,745 flights
  2. 2.United Airlines79%2,270 flights
  3. 3.Alaska Airlines69%2,753 flights

Not enough history to rank: Southwest Airlines (3 flights). We rank airlines only after 100 flights on the route.

What the data says

Morning flights do better here.

SFO–SEA flights departing between 3–6 AM arrived on time 97% of the time, versus 70% between 9 PM–12 AM.

Friday is doing you no favors.

SFO–SEA flights arrived on time 80% of the time on Saturdays. On Fridays: 71%.

Delta Air Lines runs this route best.

Delta Air Lines arrived on time 80% of the time on this route; Alaska Airlines managed 69%.

Recent months have been rougher.

SFO–SEA flights arrived on time 74% of the time over the last three months in the data, compared with 82% 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

On-time by weekday
  • Mon75%(1029 flights)
  • Tue80%(923 flights)
  • Wed77%(934 flights)
  • Thu72%(992 flights)
  • Fri71%(982 flights)
  • Sat80%(828 flights)
  • Sun73%(998 flights)
On-time by departure window
  • 3–6 AM97%(223 flights)
  • 6–9 AM78%(946 flights)
  • 9 AM–12 PM77%(1293 flights)
  • 12–3 PM76%(1218 flights)
  • 3–6 PM74%(1032 flights)
  • 6–9 PM71%(1508 flights)
  • 9 PM–12 AM70%(466 flights)
On-time trend by month
64%
May

Jun 68% → May 64% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202568%627
July 202568%626
August 202572%616
September 202579%581
October 202574%579
November 202581%556
December 202574%552
January 202684%476
February 202687%477
March 202687%511
April 202671%496
May 202664%589

Same trip, other airports

Keep nerding

Based on 6,771 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.