All the states and districts that have flipped so far
New York's 4th and 19th Districts are the fourth and fifth House seats that Democrats have flipped from red to blue so far, joining one other seat from New York and two seats that were dramatically redrawn in redistricting. However, Republicans have flipped six seats from blue to red: three in North Carolina that flipped because of redistricting, and then three in the northern presidential swing states. Altogether, Republicans have netted just one seat thus far — which goes a long way toward explaining why they're on pace to win about as many seats as they did in 2022.
On the presidential and Senate side, of course, it's a different story. All the flips there have been toward Republicans. Trump has so far been projected to win five states that Biden carried in 2020, and Republicans have made a net gain of three seats in the Senate — so far, all in states that Trump carried by a healthy margin.