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WN3857 Flight Status Southwest Airlines: Chicago to Ontario (SWA3857)

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WN 3857 Chicago to Ontario Flight Status

Southwest Airlines Flight WN3857 from Chicago Midway International Airport MDW to Ontario International Airport ONT is not scheduled for today July 18th, 2026.
The last time the flight was scheduled was on November 1st, 2025.
Check the table below for WN3857's most recent flight history:

WN 3857 Flight Status & Schedule

Date Departure Arrival Status
Nov 01 08:55 10:20
Landed
 Track >
Oct 30 13:25 15:17
Landed
 Track >
Oct 29 11:35 13:12
Landed
 Track >
Oct 28 11:22 13:09
Landed
 Track >
Oct 27 13:33 15:26
Landed
 Track >
< All MDW Departures All ONT Arrivals >

Southwest Airlines WN 3857 Chicago to Ontario Flight Information

Southwest Airlines Flight WN3857 connects Chicago, United States to Ontario, United States, taking off from Chicago Midway International Airport MDW and landing at Ontario International Airport ONT.

How long is the WN3857 flight from Chicago to Ontario?

The average flight time from Chicago to Ontario is 3 hours and 47 minutes. The flight distance is 2739 km / 1702 miles and the average flight speed is 726 km/h / 451 mph.

What is the On-Time Performance (OTP) of Southwest Airlines Flight WN3857 Chicago to Ontario?

The Airportia On-Time Performance Rating for Southwest Airlines Flight WN3857 is 4.8/5 stars. This metric is calculated using data from the past 10 flights.

Which terminal is the flight WN3857 arriving at?

Flight WN3857 arrives at Ontario International Airport (ONT) Terminal 4.

When was the latest WN3857 flight?

The latest flight took off on Saturday, November 1st, 2025 with the flight status being Landed on 10:20.

How else can the flight WN3857 be referenced as?

This Southwest Airlines flight can also be referenced as SWA3857, WN 3857, SWA 3857.

How often is flight WN3857 delayed?

On average, 40% of all WN3857 flights are delayed. The average delay is 25 minutes.

Can I get compensation for my delayed or cancelled WN3857 flight or baggage issues?

If your WN3857 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 WN3857 Flight Tracker above for more details.

WN3857 and Chicago MDW to Ontario ONT Flights

Other flights departing from Chicago MDW: WN245, WN978, WN3017, WN4830

Other flights arriving at Ontario ONT: WN2236, WN290, AA2956, WN2848

All flights connecting Chicago MDW to Ontario ONT.

WN3857 Southwest Airlines Flight: Chicago to Ontario Route Map

WN3857 Southwest Airlines Flight Map: Chicago to Ontario
Flight Delay Compensation up to 600€/$: Claim for delay, cancellation, or baggage issues >
New Flights: SY9342 MW2591 FJ1286 FJ166 AC7903 G49398 QF307 G49210 OH5018 AA9772
See Also: Flight Tracker Airports Airlines News Flights Monitor Delay Compensation
Flight-schedule data supplied by Aviation Edge Real-time Flight Schedules API.