Seattle-Tacoma International ⇄ Ontario International SEA–ONT
Airlines flew 5,009 flights between Seattle-Tacoma International SEA in Seattle, WA and Ontario International ONT in Ontario, CA in the twelve months to July 2026, both directions together: 541,058 passengers in 661,472 seats, 82% of them filled, and 846,623 pounds of freight. 956 miles, about 131 minutes in the air, on 6 airlines: Alaska Airlines Inc. (2,494), SkyWest Airlines Inc. (2,090), Frontier Airlines Inc. (334), Delta Air Lines Inc. (65) and 2 more. Planning to fly it yourself? The weather and winds along this route right now.
Flights by month both directions
By month, as a table
| flights | |
|---|---|
| 1/25 | 333 |
| 2/25 | 288 |
| 3/25 | 365 |
| 4/25 | 404 |
| 5/25 | 511 |
| 6/25 | 530 |
| 7/25 | 589 |
| 8/25 | 533 |
| 9/25 | 429 |
| 10/25 | 401 |
| 11/25 | 417 |
| 12/25 | 399 |
| 1/26 | 321 |
| 2/26 | 271 |
| 3/26 | 353 |
| 4/26 | 404 |
| 5/26 | 497 |
| 6/26 | 475 |
| 7/26 | 509 |
Passengers by month
By month, as a table
| passengers | |
|---|---|
| 1/25 | 37,048 |
| 2/25 | 33,235 |
| 3/25 | 40,673 |
| 4/25 | 42,293 |
| 5/25 | 52,564 |
| 6/25 | 59,981 |
| 7/25 | 69,653 |
| 8/25 | 65,377 |
| 9/25 | 48,745 |
| 10/25 | 41,801 |
| 11/25 | 45,527 |
| 12/25 | 45,864 |
| 1/26 | 34,792 |
| 2/26 | 30,479 |
| 3/26 | 36,446 |
| 4/26 | 37,003 |
| 5/26 | 46,581 |
| 6/26 | 52,021 |
| 7/26 | 56,422 |
The airlines twelve months, both directions
| Airline | Flights | Passengers | Seats filled | Service |
|---|---|---|---|---|
| Alaska Airlines Inc. AS | 2,494 | 352,806 | 82% | scheduled passenger service |
| SkyWest Airlines Inc. OO | 2,090 | 129,212 | 84% | scheduled passenger service |
| Frontier Airlines Inc. F9 | 334 | 52,612 | 74% | scheduled passenger service |
| Delta Air Lines Inc. DL | 65 | 6,269 | 84% | scheduled passenger service |
| Air Transport International 8C | 25 | 0 | charter cargo service | |
| Southwest Airlines Co. WN | 1 | 159 | 91% | scheduled passenger service |
The aircraft as the airlines report their types
| Aircraft | Flights | Seats a flight | Passengers |
|---|---|---|---|
| Embraer ERJ-175 | 2,090 | 73 | 129,212 |
| Boeing 737-900ER | 976 | 178 | 142,655 |
| Boeing B737 Max 900 | 899 | 178 | 130,810 |
| Boeing 737-800 | 378 | 160 | 50,765 |
| Airbus Industrie A321-200n | 156 | 239 | 24,110 |
| Airbus Industrie A320-200n | 133 | 186 | 21,459 |
| Boeing B737 Max 800 | 131 | 160 | 16,958 |
| Boeing 737-700/700LR/Max 7 | 108 | 124 | 11,207 |
| A200-100 BD-500-1A10 | 55 | 109 | 5,013 |
| Airbus Industrie A321Neoxlr | 26 | 230 | 4,121 |
| Boeing 767-300/300ER | 25 | 0 | 0 |
| Airbus Industrie A320-100/200 | 19 | 186 | 2,922 |
| Boeing 737-900 | 8 | 178 | 1,282 |
| A220-300 BD-500-1A11 | 5 | 130 | 544 |
SEA → ONT this direction alone · flown January 2025 to July 2026
2,514 flights of 2,513 scheduled, 272,137 passengers in 332,534 seats, 88,023 pounds of freight, 5,730 pounds of mail. Alaska Airlines Inc. 1,256; SkyWest Airlines Inc. 1,046; Frontier Airlines Inc. 166; Delta Air Lines Inc. 36; Air Transport International 9; Southwest Airlines Co. 1.
ONT → SEA this direction alone · flown January 2025 to July 2026
2,495 flights of 2,514 scheduled, 268,921 passengers in 328,938 seats, 758,600 pounds of freight. Alaska Airlines Inc. 1,238; SkyWest Airlines Inc. 1,044; Frontier Airlines Inc. 168; Delta Air Lines Inc. 29; Air Transport International 16.
Source: the Bureau of Transportation Statistics' T-100 Segment table (all carriers). A flight is one departure performed on this segment; seats and passengers are the airlines' own monthly reports; "seats filled" is passengers divided by seats. The miles are the DOT's great-circle distance. Both ends: Seattle-Tacoma International SEA and Ontario International ONT; all routes.