If you are willing to add the content under the price on the single trip page while using WP Travel plugin then you can simply add it through the backend of the single trip page. Using the Excerpt section provided by WordPress, you can simply add the content under the price.
To add the content under the price, you can simply add in the Excerpt by going through Admin Panel > Trips > Individual Trip as shown in the screenshot below
Frontend view after adding the content:
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