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I think this isn't answerable without having point of reference from which speed at which earth travels in space, however if I am wrong the please give absolute distance.
Considering that earth spins around it's axis and around the sun and solar system rotates around centre of the galaxy.

The circumference of the Earth at the equator is 25,000 miles. The Earth rotates in about 24 hours. Therefore, if you were to hang above the surface of the Earth at the equator without moving, you would see 25,000 miles pass by in 24 hours, at a speed of 25000/24 or just over 1000 miles per hour.

Earth is also moving around the Sun at about 67,000 miles per hour.

Using speed measurements of the gas at different distances from the Galactic centre, the Sun appears to be cruising along at 200 kilometres per second and it takes 240 million years to complete the grand circuit around the Galaxy.

I am not sure if it's ok to just add numbers or some formula should be used since all the movements are rotational.

If average person lives 80 years, what distance does one travels in his lifetime?

EDIT: Point of reference should be centre of our galaxy, unless you believe there is better point of reference possible.
EDIT2: Is this correct calculation or am I missing something.

1000 mph = 447.04 m/s, 67000 mph = 29951.68 m/s
447.04+29951.68 + 200000 = 230398.72 m/s
80 years = 2.52455e9 seconds
230398.72 m/s * 2.52455e9 seconds = 5.8165309e+14 meters
5.8165309e+14 metres = 3888.11076 Astronomical Units OR 0.0614820933 Light Years.

Edit3: Following answer from @Johannes

371000 m/s * 2.52455e9 seconds = 9.3660805e+14 metres
9.3660805e+14 metres = 6260.83811 Astronomical Units OR 0.0990016635 Light Years.

Edit4: I just realised that I need to add all 4 (earth rotation + rotation around sun + rotation around galaxy + and galactic cluster movement speed relative to CMB).

5.8165309e+14 meters + 9.3660805e+14 metres = 1.5182611e+15 metres
1.5182611e+15 metres = 10148.9489 Astronomical Units = 0.160483757 Light Years

One travels ~16% of light year in a lifetime.

Matas Vaitkevicius
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In this context, the least ambiguous reference frame is the comoving rest frame. In essence, this is the local frame moving along with the local Hubble expansion. We can accurately determine earth's velocity with respect to this comoving frame (and thereby obtain our so-called peculiar velolocity) by subtracting out the dipole anisotropy from the Doppler shift of the microwave background radiation (the afterglow of the Big Bang). It follows that earth moves at a speed of 371 km/s in the direction of constellation Leo.

Now you can do the math using 371 km/s and the fact that there are 3600 x 24 seconds in a day and 365.25 days in a year.

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Johannes
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