I've been looking at flights from DFW to Santiago and have flown direct/nonstop in the past between the two, but all of a sudden they've disappeared. All flights have a stop in Atlanta or Miami. Does anyone know anything about this or why they aren't offering nonstop? Is this temporary? Thanks!

No doubt related to the decision by LATAM to partner with Delta (and not American) and share hubs.

Nonstops on Sunday, Wednesday, and Friday going south through Oct 27 and then daily after that.

At the following link choose the One Way tab, select tomorrow's date (notice that "See calendar of lowest fares" is toggled on). Click Search and you will see the 30-day calendar.

Here is the search page:
Matrix - ITA Software by Google

Change the date above the calendar to be the same day of the month for next month and click on Update to see the calendar for 30-60 days out. Do the same for following months. You can also click on Modify Search to search with a different date

This shows the calendar result of the search:
Matrix - ITA Software by Google

For SCL to DFW, click Reverse route on the search page, choose One way, and type USD in the Currency box, then Search.

Nonstops going north on Mon Thu Sat thru Oct 28 and then daily.

Probably daily each way through the southern summer.

Moved to the Air Travel forum

Thanks, Mod. My post showed how ITA Matrix can be used to answer the OP question.

Another, maybe better way, is with Google Flights. You want/know there are nonstops for your trip, so you choose the Nonstop filter. You might get this result: Dallas to Santiago | Google Flights

Just click on "Date grid" to see the scheduled nonstops on dates around your dates. Use the arrows next to Departure and Return to see more dates.