Traveling give me all the tips!

Hi all I’m curious if you have any tips or recommendations on traveling with a 2 year old. Preferably not expensive options. I really want to take my son to see snow even if it’s just a 3-4 day trip (we will lose the first and last day with travel) I was told about discount den through frontier that I’ve been looking into but once you add in seats and a checked back it totals other airlines basically. I found a better deal through Expedia lol Please share allll the travel tips and if you have an airline approved car seat that isn’t crazy in price that’s a bonus! Thank you!