Google may be testing a new type of rich result for flight prices. This test shows a section under the flight search snippet that contains the dates, trip details and price.
This was spotted by Antoine Eripret who was able to trigger this numerous times, over numerous days, while in Spain. Here is his screenshot he posted on X:
He also posted this video of this in action for me:
Recently Google told us not to put flight prices in titles because those prices change too quickly. Maybe Google is testing updating those prices in more real time through the use of structured data and is thus more confident to show them as rich results and not title elements?
I don't think Google officially supports flight schema but maybe they will soon?
Forum discussion at X.