Any way to find out how crowded a plane will be ? (before buying the ticket)

I have several options to go from point A to point B. I am just curious if there is a way to find out how crowded a flight will be on average (before buying the ticket of course)?
I am aware that airline companies would not want to share such an info, but a ballpark figure, or a seasonal average would be helpful.
One thing, I can think of to look at each airports yearly passenger numbers, and divide it to total number of flights, but that will be a very coarse estimation.
Best Answer
Couple of suggestions:
Time of year: If flight date is on/near the start of holiday season or major vacation time, then expect more travelers; if school vacations, more so.
Regular airlines vs. charters (for example Air Canada vs. Air Transat): Regular airlines will fly regular routes and will/can fly more often with a less than full plane.
Destination: if destination is a major destination (major hubs like Amsterdam, London...) planes will be more full because of connecting flights.
In all case, expect the worse, and hope for the best (expect a full plane and hope for extra seats)
Good luck.
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How do I find out how many seats are available on a flight?
Check on the Airline's Booking Page When booking through a third party, such as Expedia or Travelocity, you can check the number of seats available on the plane too. On Expedia, look for the link that says "Preview Seat Availability," which will appear under each flight that shows up in your search.Is there a way to tell how full a Southwest flight is?
Checking Your Flight StatusScroll down to the bottom of the webpage to find a section titled "Other Flight Information". The number of people on the flight will appear as well as the number of seats available.How do I find less crowded flights?
How can I tell if a United flight is full?
Select the flight you want, then click on the \u201cView seats\u201d tab beside the flight number for your flight. This will open a new window displaying all the occupied and available seats in the cabin you chose. Count the number of available seats in this cabin on this flight.[720P] - Dylan lawson from Kentucky crowd stunning in the.x.factor.s01e02
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Answer 2
Some airlines (United for example) let you see the available seats before you book. That's a fairly decent indicator if it's not too far in the future.
Unfortunately plane loading depends on a large number of factors, time of year, week day, holidays/vacation, route popularity and capacity, connecting routes capacity (and changes) and also special events at source or destination. Sports, graduation, big conference, etc. All of this makes it very difficult to do meaningful statistics.
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