Here are our flight details for March 10.

ORD-JFK-LHR

Delta 3646 leaving ORD at 2:20 pm arriving JFK 5:36 pm

Virgin Atlantic 4 leaving JFK at 6:30 pm arriving LHR 6:30 am

The original booking had the ORD-JKF segment arriving at 5:34 and showed the flight would arrive at terminal 4. It also had a different flight number. I can't find out if the new ORD-JFK segment also arrives at terminal 4.

Is this much too close?

Since the first segment has changed (albeit 2 minutes), would I be able to change flights (either leaving later from JFK or earlier from ORD)? I'm new to all of this.

Also, I booked the flights through Expedia on Virgin. Would I need to go through Expedia, Virgin or Delta to change if it was allowed?

I'd appreciate any feedback. We have 5 people traveling (three adults, one teen and one senior).