A "midweek trip" refers to traveling or going on a journey during the middle of the week, specifically Tuesday, Wednesday, or Thursday. Full definition
Bonus: Fares for midweek trips are usually slightly less than those on more popular weekends. (travelskills.com)
THis rtesult never really looked in doubt once Arsenal had taken an early lead away to struggling Aston Villa and despite some signs of fatigue in the second half, quite understandable after a long and tiring midweek trip to Greece, the Gunners got the jod done quite comfortably and finish the weekend right where we want to be, on top of the Premier League table. (justarsenal.com)
That was a long midweek trip to Middlesbrough's Riverside where Jose Mourinho's title - winning side had surprisingly been beaten heavily the season before. (chelseafc.com)