Does the dart train go to the state fair in Dallas on Sunday? If so, what time is it scheduled to leave & what time is it scheduled to return?

Yes & it runs regularly all day long.

Yes darts provides transportation to the state fair from Parker Road station but you would have to get off of the red line Westmoreland train at Pearl station to catch the green line Fair Park Station train so yes it does but you must transfer at Pearl station downtown Dallas to catch the green line Fair Park Station train

The State Fair is considered a special event so YES they provide service to and from all day.