Most Logical Route Heathrow to Greenwich?

The easiest with the least amount of changes:

Take the Elizabeth Line towards Abbey Wood. Get off at Canary Wharf.

Walk over to the DLR station--just a few minutes--and take the DLR towards Lewisham. Get off at Greenwich.

From there it's a two minute walk to your hotel.

The fare is £13.30/person.

My suggestion is to download the Citymapper app for help with transportation.

There are no scheduled engineering works that day on this route but the Elizabeth line will be busier than normal due to engineering work out of Heathrow on the tube.

Getting off the DLR at Greenwich there are no ticket gates so follow everyone else and find the readers on a pole by the exit to swipe out on whatever payment method you are using.

Likewise getting on the DLR at Canary Wharf. You will have swiped out of Elizabeth line but need to find the readers on the DLR to swipe in- it is treated as a through journey as long as you don't go exploring the wharf.
I think it's 30 minutes you are allowed as an interchange time before it is treated as separate journeys.
You are allowed 2 hours 25 minutes on a Sunday (2 hours on a weekday) to make the through journey- a good hour longer than it will actually take.

A logical non Elizabeth line route, in case it isn't available, is Piccadilly line to Green Park, Jubilee to London Bridge, and Southeastern train to Greenwich. Cost: £6.40. (Could also get Jubilee to Canary Wharf, then as above.)

There is a completely illogical and slow route possible for only £2.10. Only for the very cost conscious.

Thanks everyone!

There is a completely illogical and slow route possible for only £2.10. Only for the very cost conscious.

There are actually 3 very roundabout routes for that £2.10 fare. On both routes to tell the computer the route you have taken you have to swipe the pink routing card readers at the interchange stations.

Route 1 is Piccadilly to Turnham Green, change to a Richmond bound district line 1 stop to Gunnersbury (pink reader), change to London Overground for the 1 hour journey to Stratford (pink reader), DLR to Greenwich.

Route 2 Piccadilly to Earls Court, change to a Wimbledon bound District line train 1 stop to West Brompton (pink reader), change to Overground to Willesden Junction, change to Overground to Stratford (pink reader), DLR to Greenwich

Route 3- same as route 2 but you take a train to Kensington Olympia (pink reader) for the Overground from Earls Court.

These fares may be so cheap because it is doubtful if you can do them within the maximum weekday time allowance for the journey. Caveat emptor.

I have just looked up the maximum interchange time at Canary Wharf Elizabeth Line to DLR- it is 20 minutes, not 30 minutes as I previously stated. That is swipe out to swipe in time. So you have time to use the restrooms but not much else.

This is on the Out of Station (OSI) list published by TfL.

Thank you, isn31c! We will not dally.

Route 1 is Piccadilly to Turnham Green, change to a Richmond bound district line 1 stop to Gunnersbury (pink reader), change to London Overground for the 1 hour journey to Stratford (pink reader), DLR to Greenwich ...

This particular route is in the TfL fare finder so really should be achievable with Oyster for those brave / mad enough to try it.

Just because it is in the fares manual does not mean that it is achievable. Before writing I had checked TfL's own sectional timings, and sectional timings put you a minute or two over the weekday 2 hour limit, let alone adding the walking and waiting time at each interchange. It could even matter which Heathrow Terminal you started at, it is so tightly timed and using the correct exit door on each train for exits.

The same £2.10 fare also applies from Heathrow to Upminster on the same routes then to West Ham, then C2C, or via the Goblin line to Barking then C2C. Sectional timings make that even less likely to be achievable, at least via West Ham.

Anyone daft enough to try would be clock watching and stressing all the way. There are you tubers I know who are the kind to try it, perhaps I should recommend this exercise to them.