| Date | From | To | Departure | Arrival | Status | |
|---|---|---|---|---|---|---|
| Sep 03 | ONT | SEA | 06:38 | 08:57 |
Landed
|
Track > |
| Sep 02 | ONT | SEA | 06:33 | 09:04 |
Landed
|
Track > |
| Sep 01 | ONT | SEA | 06:34 | 08:57 |
Landed
|
Track > |
| Aug 31 | ONT | SEA | 06:26 | 08:57 |
Landed
|
Track > |
| Aug 30 | ONT | SEA | 09:00 | 09:17 |
En-Route
|
Track > |
| Aug 29 | ONT | SEA | 08:08 | 10:30 |
Delayed
|
Track > |
| Aug 28 | ONT | SEA | 06:26 | 08:42 |
Landed
|
Track > |
| Aug 27 | ONT | SEA | 06:23 | 08:36 |
Landed
|
Track > |
| Aug 26 | ONT | SEA | 06:24 | 08:38 |
Landed
|
Track > |
| Aug 25 | ONT | SEA | 06:26 | 08:43 |
Landed
|
Track > |
KLM Flight KL6721 connects Ontario, United States to Seattle, United States, taking off from Ontario International Airport ONT and landing at Seattle Tacoma International Airport SEA.
How long is the KL6721 flight from Ontario to Seattle?
The average flight time from Ontario to Seattle is 2 hours and 20 minutes. The flight distance is 1540 km / 957 miles and the average flight speed is 645 km/h / 401 mph.
How many KL6721 flights are operated per week?
7 flights per week. The flight KL6721 is operated on Monday, Tuesday, Wednesday, Thursday, Friday, Saturday and Sunday.
What is the On-Time Performance (OTP) of KLM Flight KL6721 Ontario to Seattle?
The Airportia On-Time Performance Rating for KLM Flight KL6721 is 4.9/5 stars. This metric is calculated using data from the past 10 flights.
When was the latest KL6721 flight?
The latest flight took off on Thursday, September 3rd, 2026 with the flight status being Landed on 08:57.
How else can the flight KL6721 be referenced as?
This KLM flight can also be referenced as KLM6721, KL 6721, KLM 6721.
How often is flight KL6721 delayed?
On average, 10% of all KL6721 flights are delayed. The average delay is 73 minutes.
Can I get compensation for my delayed or cancelled KL6721 flight or baggage issues?
If your KL6721 flight was cancelled, delayed, or if you experienced baggage issues such as delayed, damaged, or lost bags, you may be entitled to compensation. Compensation amounts and eligibility depend on various regulations, including EC 261/2004, UK261, CA Montreal Convention, US GoodWill, BR-ANAC, SA-GACA and TK-SHY.
See our KL6721 Flight Tracker above for more details.
Other flights departing from Ontario ONT: OO3816, WN124, WN654, A81902
Other flights arriving at Seattle SEA: AS78, DL354, OO3816, F94545
All flights connecting Ontario ONT to Seattle SEA.