We have traveled the last 4 years during April vacation and this past year was the worst I have seen for flying out of Boston and even Providence- $4500 bucks for 4 tickets. I'm partial to JetBlue and as soon as flights were released I started looking. Albany was $1300-$1800 (for 4 tickets Fri-Fri was cheaper than Sat-Sat) I wanted to book but we hadn't closed yet on our
DVC sale so we really wanted to make sure we had our dates secure before we booked flights. We ended up booking Delta out of Hartford and a return flight home on JetBlue. A friend of mine booked Southwest out of Manchester the day they were released and she got 4 tickets for a little bit less than 2k. I'm going to keep Southwest in mind for our next trip (trying Feb vacation 2019).
My suggestions are to be ready to book as soon as flights are released. Prices don't seem to drop for school vacation weeks and to be flexible on times/day. A Sat-Sat during vacation week is going to be the most expensive. We are flying Sat- Friday (got the last flight out on Friday). Always look at 1 way fares- sometimes it can be cheaper to fly one airline down and another back. Mon-Mon seems a bit more reasonable if you are okay with missing a day.