Travel between central London & central Paris

That's a 'no brainer' - without question the Eurostar

Unless you are connecting - on one ticket - with another flight at either your Paris airport (there are 3) or your London airport (there are 7 if you include the less popular or convenient) and are already at the airport you need, it will be much faster and easier to take Eurostar which links the two centre cities in just over 2 hours.

With around 45 minutes check in time required (must absolutely be through the magic gate 30 minutes or you won't be allowed on) and two hours travel time right to centre town that is dramatically faster than flying. Flying is an hour to the airport, 90 minutes check in, 90 minutes on the aircraft, 90 minutes in queues at the airport to go through immigration, collect luggage, breeze through customs and get to the transport where you will wait for the next, and an hour on the RER or in a taxi - so a total of around 6 and half hours.

3 or 6 1/2? Your choice.

Eurostar! Way quicker than flying and you end up right in central Paris with no airports to deal with.

Eurostar's just 2 1/2 hours--and the way to go.

I took Eurostar last week and it is amazingly easy. Lots of useful info is available on seat61.com and many tips on this forum too.

I found better prices using the Eurostar.uk website, not the US version. The best price is available when the tickets first go on sale about 6 months before your travel date.

What they all said -- Eurostar. Fast, efficient, comfortable. Grab a snack and a bottle of bubbly at M&S before boarding and enjoy the ride to Paris.

If you want to go city centre to centre, as per your post title, there is no alternative to the .Eurostar unless you sprout wings.

I don't think anyone has mentioned this yet but you could take Eurostar. :)

I just remembered . There is a bus (Eurolines?) from London to Paris. Cheap, takes forever, but is centre city to centre city, more or less.

Eurostar of course.

Thanks to all for your input - Eurostar it is!