Hi Cole thanks for posting in the community! Unfortunately DXF file import is not currently supported in Lucidchart. However Lucidchart does allow you to import diagrams from MS Visio (.vdx .vsdx and .vsd) Gliffy (.gxml .gliffy) Draw.io (.xml) and Omnigraffle (.graffle .graffle.zip). 

If you would like to see this functionality in the feature would you mind adding your idea to our feature request form? Ideas submitted to this form are passed on to the product development team for their consideration.

Thanks for your request and I apologize for any inconvenience this causes you.