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DL521 Flight Status Delta Air Lines: Ontario to Los Angeles (DAL521)

Are you looking for the October 19th, 2026 DL 521 Dallas to Los Angeles flight? Click here to go to our DL521 Dallas to Los Angeles Flight Status page >

DL 521 Ontario to Los Angeles Flight Status

Delta Air Lines Flight DL521 from Ontario International Airport ONT to Los Angeles International Airport LAX is not scheduled for today October 19th, 2026.
The last time the flight was scheduled was on October 10th, 2026.
Check the table below for DL521's most recent flight history:

DL 521 Flight Status & Schedule

Date Departure Arrival Status
Oct 10 18:27 18:39
Landed
 Track >
< All ONT Departures All LAX Arrivals >

Delta Air Lines DL 521 Ontario to Los Angeles Flight Information

Delta Air Lines Flight DL521 connects Ontario, United States to Los Angeles, United States, taking off from Ontario International Airport ONT and landing at Los Angeles International Airport LAX.

How long is the DL521 flight from Ontario to Los Angeles?

The average flight time from Ontario to Los Angeles is 12 minutes. The flight distance is 75 km / 47 miles and the average flight speed is 377 km/h / 234 mph.

What is the On-Time Performance (OTP) of Delta Air Lines Flight DL521 Ontario to Los Angeles?

The Airportia On-Time Performance Rating for Delta Air Lines Flight DL521 is 4.9/5 stars. This metric is calculated using data from the past 10 flights.

When was the latest DL521 flight?

The latest flight took off on Sunday, October 11th, 2026 with the flight status being Landed on 18:39.

How else can the flight DL521 be referenced as?

This Delta Air Lines flight can also be referenced as DAL521, DL0521, DL 521, DAL 521.

How often is flight DL521 delayed?

On average, 100% of all DL521 flights are delayed. The average delay is 9 minutes.

Can I get compensation for my delayed or cancelled DL521 flight or baggage issues?

If your DL521 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 DL521 Flight Tracker above for more details.

DL521 and Ontario ONT to Los Angeles LAX Flights

Other flights departing from Ontario ONT: OO4031, OO3031, Y41863, 8C3383

Other flights arriving at Los Angeles LAX: DL747, AA3201, 6R7086, DL1950

All flights connecting Ontario ONT to Los Angeles LAX.

DL521 Delta Air Lines Flight: Ontario to Los Angeles Route Map

Flight Delay Compensation up to 600€/$: Claim for delay, cancellation, or baggage issues >
New Flights: JJ9550 S9878 SM127 N8317 NO8030 AH6791 9X2019 CC4994 5Y9864 LA1053
See Also: Flight Tracker Airports Airlines News Flights Monitor Delay Compensation
Flight-schedule data supplied by Aviation Edge Real-time Flight Schedules API.