Route
SEA → ONT
Seattle–Tacoma International Airport Ontario International Airport
How punctual is this route?
- On-time arrivals
- 82.6%
- Less than 15 minutes late
- Cancelled
- 1.0%
- Of scheduled flights
- Average delay when late
- 56 min
- Flights arriving 15+ minutes late
- Flights tracked
- 2,487
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 52%
- Late-arriving aircraft 26%
- Air traffic control & airport 15%
- Extreme weather 7%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 91.1% | 213 |
| October 2025 | 87.9% | 200 |
| November 2025 | 82.8% | 211 |
| December 2025 | 72.2% | 200 |
| January 2026 | 85.3% | 157 |
| February 2026 | 84.4% | 135 |
| March 2026 | 86.2% | 177 |
| April 2026 | 89.5% | 200 |
| May 2026 | 86.2% | 249 |
| June 2026 | 85.6% | 240 |
| July 2026 | 67.9% | 256 |
| August 2026 | 77.0% | 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 | 77.5% | 1.5% | 52 min |
| SkyWest Airlines | 1,053 | 88.3% | 0.4% | 61 min |
| Frontier Airlines | 169 | 84.3% | 1.8% | 84 min |
| Delta Air Lines | 8 | 100.0% | 0.0% | — |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
OO4031
13% late · 348 flights
-
AS1364
10% late · 294 flights
-
AS592
28% late · 244 flights
-
AS489
30% late · 224 flights
-
OO4027
12% late · 218 flights
-
OO4070
13% late · 177 flights
-
AS664
22% late · 127 flights
-
OO3884
13% late · 117 flights
-
F92276
12% late · 100 flights
-
OO4096
4% late · 96 flights
-
AS571
50% late · 73 flights
-
F93163
20% late · 69 flights
-
AS565
26% late · 64 flights
-
AS1254
9% late · 54 flights
-
AS1086
12% late · 51 flights
-
AS1118
12% late · 32 flights
-
OO3840
3% late · 31 flights
-
AS625
18% late · 28 flights
-
OO3709
8% late · 24 flights
-
OO4170
0% late · 24 flights
-
AS1003
29% late · 22 flights
-
AS728
5% late · 21 flights
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