Below are a list of the resources I use to find deals on travel. I will update accordingly. I personally do not recommend Expedia, Priceline, etc for finding or booking any accomodations for your travel.
Airbnb– usually my top choice in accommodations
Skyscanner– they also have an app (some carriers are not listed)
Momondo– they also have an app (some carriers are not listed)
Google Flights – My absolute favorite flight resource. If you’re looking for last minute vacation ideas with cheap flights or looking to go anywhere- as they have an everywhere option which populates the cheapest flights within a time frame chosen from your home airport.
Hotel Tonight– I often don’t even use this for last minute accommodations, but to scout out any deals/specials at hotels going on currently.