Generally orbital inclination change is said to be (fuel) expensive. What is the biggest orbital inclination change (in degrees) done in Earth's orbit for an orbiting object? Can this be broken down by orbits (LEO, geostationary etc.) and by mission (commercial satellite, military/governmental, human spaceflight etc.)?
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$\begingroup$ potential candidates might be found in What inclination change could the 5th stage Orion 38 motor provide ORS-5 (SensorSat)? and Has anything ever executed an orbit change such as between ISS and Hubble? and Spacecraft Maneuvers as Intellectual Property? Wow! and Would lunar flyby be less costly in delta-v than direct change from ISS's to Hubble's orbit? Big changes can sometimes be done with the Moon $\endgroup$– uhohCommented Mar 26, 2021 at 13:07
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For low-earth orbit satellites, the IXPE satellite was launched from Canaveral to a 28.5 degree orbit. The 2nd stage of the falcon rocket then changed its inclination to a 0.2 degree, equatorial, orbit.
This odd maneuver was done to prevent the sensitive x-ray payload of the satellite from being exposed to the South Atlantic anomaly.
For more on that see:
