Route
ONT → SEA
Ontario International Airport Seattle–Tacoma International Airport
How punctual is this route?
- On-time arrivals
- 85.9%
- Less than 15 minutes late
- Cancelled
- 1.1%
- Of scheduled flights
- Average delay when late
- 74 min
- Flights arriving 15+ minutes late
- Flights tracked
- 2,488
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 46%
- Late-arriving aircraft 37%
- Air traffic control & airport 12%
- Extreme weather 5%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 88.2% | 213 |
| October 2025 | 84.8% | 200 |
| November 2025 | 87.3% | 211 |
| December 2025 | 81.7% | 200 |
| January 2026 | 87.9% | 158 |
| February 2026 | 95.6% | 135 |
| March 2026 | 87.4% | 177 |
| April 2026 | 91.0% | 200 |
| May 2026 | 89.1% | 249 |
| June 2026 | 84.4% | 240 |
| July 2026 | 80.6% | 256 |
| August 2026 | 79.3% | 249 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 – August 2026. Covers flights operated by reporting U.S. carriers. About our data
Airlines on this route
| Airline | Flights | On time | Cancelled | Avg. delay when late |
|---|---|---|---|---|
| Alaska Airlines | 1,257 | 82.2% | 1.8% | 60 min |
| SkyWest Airlines | 1,054 | 91.7% | 0.3% | 106 min |
| Frontier Airlines | 169 | 77.1% | 1.8% | 81 min |
| Delta Air Lines | 8 | 87.5% | 0.0% | 15 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
OO4031
12% late · 322 flights
-
AS654
13% late · 310 flights
-
AS607
7% late · 294 flights
-
OO4042
5% late · 224 flights
-
OO4070
10% late · 177 flights
-
AS594
34% late · 137 flights
-
F92275
24% late · 126 flights
-
AS665
21% late · 125 flights
-
OO3816
6% late · 117 flights
-
OO4096
6% late · 96 flights
-
AS575
39% late · 72 flights
-
AS567
20% late · 63 flights
-
AS1091
11% late · 54 flights
-
AS1111
23% late · 54 flights
-
F93164
21% late · 43 flights
-
AS1119
18% late · 33 flights
-
OO3840
10% late · 31 flights
-
AS625
29% late · 28 flights
-
OO3697
0% late · 26 flights
-
AS592
33% late · 24 flights
-
OO3690
0% late · 24 flights
-
OO4170
0% late · 24 flights
-
AS729
5% late · 21 flights
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