Here's why it's tricky:
* Different types of missions: There are crewed missions, cargo missions, and even robotic missions that service the ISS. Do all of these count as "flights"?
* Varying definitions of "flight": Do individual spacecraft launches count as a "flight", or is it the entirety of the mission to the ISS (including docking and undocking)?
* Ongoing missions: The ISS is still operational, so the number of flights is always changing.
To give you a general idea:
* Crewed missions: There have been over 60 crewed missions to the ISS, including missions by NASA, Roscosmos, ESA, JAXA, and CSA.
* Cargo missions: There have been hundreds of cargo missions, using spacecraft like Progress, Soyuz, Dragon, Cygnus, and HTV.
If you want to know the exact number of specific types of flights, you'll need to consult the following:
* NASA's website: You can find detailed information about every ISS mission on NASA's website.
* Space agency websites: Each space agency involved in the ISS program (Roscosmos, ESA, JAXA, CSA) has its own records of their missions.
Please be more specific with your request, and I can try to find the information you need. For example, are you interested in:
* The total number of crewed missions to the ISS?
* The number of cargo missions delivered by SpaceX?
* The number of times a specific spacecraft has flown to the ISS?
