Delta Air Lines again took the top spot for August North
American on-time performance, according to the latest report from aviation
analytics company Cirium.
Delta’s August 2025 on-time performance was 83.9 percent, up
nearly 7 percentage points month over month. Spirit Airlines held steady in
second place at 78.5 percent, an increase of nearly 2 percentage points. Alaska
Airlines rounded out the top three at 77.4 percent, an increase of 2.2
percentage points from July.
[Report continues below chart.]
Overall August North American on-time performance rose 4
percentage points to 75.8 percent in the month. Southwest jumped to fifth place
from seventh on a 6.8 percentage point rise in on-time performance for August. Westjet
was the only airline with declining performance (down 1.5 percentage points)
and falling to last place in the top 10. Frontier rose 5.9 percentage points to
70.8 percent to take ninth place for August.
Only Delta among North American carriers made Cirium’s
global list of top on-time carriers, which in August was led by Azul at 92.2
percent.
Southwest among North American carriers had the highest
completion rate at 99.7 percent. The top three carriers for on-time performance
in August all had completion factors above 99 percent—Spirit at 99.8 percent,
Delta at 99.3 and Alaska at 99.2.
A flight is considered on time if the aircraft arrives at
the gate within 15 minutes of its scheduled arrival time.
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