Looking For Travel-related APIs Or Datasets For Estimating Flight And Daily Costs

Hi all! I’m interested in finding APIs or open datasets that provide average travel costs for various destinations worldwide, including things like flight prices and daily expenses.

Ideally, I’m looking for options that cover multiple countries and can provide reasonable cost estimates for different types of travelers (budget, mid-range, etc.).

Any recommendations for APIs (like Skyscanner, Amadeus, etc.) or public datasets you’ve found useful? Also curious about any insights on pricing or request limits if you’ve worked with them. Thanks in advance!