What's the fastest way to transfer from Terminal 2D to terminal 2E (M gates) in CDG airport?

I will have a very tight transfer soon between a Schengen flight to 2D and a non-Schengen flight from terminal 2E, M gates. For certain reasons I'd rather not miss it, even if it means I'm guaranteed a free hotel stay (as the next flight is in 24 hours) and a 600EUR compensation.

What's the fastest way to transfer between the two parts of the airport? If it matters I'm a fast runner with a very small carry on. Looking at the map I can see two options:

Walk to terminal 2F, then to terminal 2E, then take the tram to M gates
Take the "blue route" bus from 2D, which eventually stops at the M gates

Or perhaps I'm unnecessarily worried and an Air France representative would meet me at the arrival gate if my flight is delayed?

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What's the fastest way to transfer from Terminal 2D to terminal 2E (M gates) in CDG airport? - Modern plane parking on stand near assigned gate in modern airport terminal at night

What's the fastest way to transfer from Terminal 2D to terminal 2E (M gates) in CDG airport? - Back view of trendy businesswoman carrying baggage before flight near airport building

What's the fastest way to transfer from Terminal 2D to terminal 2E (M gates) in CDG airport? - Through glass modern aircraft parked near airbridge in contemporary airport against picturesque dusk sky

How do I get from terminal 2B to 2E at CDG?

The blue shuttleShuttle available in the international zone (for a connection). The blue shuttle provides a link between terminals 2B-2D > terminals 2F and 2E Gates L > terminal 2E Gates K > terminals 2A-2C.

How do I get from Terminal 2E to 2D at Charles de Gaulle airport?

take the people mover to the 2E main building.

go through immigration and customs.

walk: take a left, go up, walk to the train station, go the opposite corner, walk to 2D.

go through security.

Can you walk between terminals at Charles de Gaulle?

CDG estimates you can walk from Terminal 2D to Terminal 2E in under 15 minutes. If you are arriving from outside the Schengen Treaty area, you will have to go through Immigration (Passport Control) and this can easily take an hour.

How do I get between terminals at Charles de Gaulle airport?

There are two free shuttle buses that connect the seven separate terminals at Charles de Gaulle's Terminal 2. Follow signs for for the interterminal shuttles, which are labeled as N1 and N2. These shuttles connect passengers who are outside of airport security and immigration.

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