how do i conmect my macbook air 2017 to my dell p2419hc monitor ?

NJipaderic,

Our apologies! You should have a Thunderbolt port that you can use. Per the Identify the ports on your Mac page from Apple, you can use the Thunderbolt port with a Mini DisplayPort to HDMI Cable to connect directly from the Thunderbolt port on your MacBook Air to the HDMI port on your monitor. 

If you go to the Apple website and choose Mac > Accessories > Power & Cables and search by Product Type/Cables and Compatibility/MacBook Air (13-inch, Early 2015 - 2017) you can see the Mini Display Port to HDMI Cables that they sell for an idea about which cable to get.

Cables - MacBook Air (13-inch, Early 2015 - 2017) - Power & Cables - Mac Accessories - Apple

Hopefully this helps!

Hello, NJipaderic.

Thank you for posting in Apple Support Communities. We can help you decide the best adapters for connecting your MacBook Air and DELL monitor. Apple also has some great resources you may want to reference:

Use an external display with your MacBook Air - Apple Support

MacBook Air accessories - Apple Support

Use external monitors with your Mac - Apple Support

Get help with video issues on external displays connected to your Mac - Apple Support

We looked at the technical specifications for your monitor, and it looks like it supports HDMI, USC-C, USB 3 and DisplayPort interfaces. The USB-C ports on your MacBook Air should work well with your monitor, so the adapter choice is really up to you. 

Either of these will work:

• If you prefer to use an HDMI cable, you’ll want this adapter: USB-C Digital AV Multiport Adapter - Apple
• If you’re using the VGA cable, this adapter is your best bet: USB-C VGA Multiport Adapter - Apple

Warmest Regards.