Best way from St. Pancras to Paddington Stn.

Hi there, if you are starting at St Pancras, if time is not an issue, and if you want the easiest option (which to me means fewest connections) then I’d just take the Piccadilly line tube straight to Heathrow. Get on the tube at Kings Cross/St Pancras, sit down, and 70 min later you are at Heathrow, all for ~£5.60. FYI, I used Citymapper and chose “simplest” routing.

Other public transport options might save you some time but are more complex because they combine multiple modes of transport and also cost more. According to Citymapper, a taxi from St P to Heathrow would take about the same time as the tube, barring traffic delays.

Of course, your definition of “easiest” might differ from mine!

Let’s see what our London friends recommend when it’s morning over there.

Thanks for your reply. I am not doing the tube in recent years since I don’t want to do a lot of walking or stairs, but I will check out King’s Cross. Could be an option for me.

It's sort of morning here in the UK. I've been up for other things and am not going back to bed now.

King's Cross and St Pancras stations have one shared tube station- Kings Cross St Pancras which is a hugely improved station, and step free, fully accessible these days. No steps to worry about at either end of the tube journey or of the Elizabeth line connection below.

If time is not of the essence then yes the most obvious route and "easiest" is the Picc line - it should be the straight hour to Heathrow. But in the evening peak it will get very busy as you go through London then slowly empty out again as you head west.

With the opening of the Elizabeth Line you don't need to go to Paddington for HEX, $$ spent (unless you get a cheap ticket long in advance) for marginal time gain. If you want to do that then take the Circle line or Hammersmith and City Line (shared platform at KX) the 10 minutes to Paddington.

The other choice is to take the Circle/Hammersmith and City/Metropolitan line 1 stop eastbound to Farringdon, then change to the Elizabeth Line which will take you all the way to Heathrow in 36 minutes.
(the way the Elizabeth Line platforms are arranged at Farringdon you can access them from Barbican tube station as well, but on a through journey Farringdon is the place to change).

The last choice would be by cab, as you are unlikely to get any time benefits for the $$ spent.

St Pancras is directly connected to the King's Cross St Pancras underground station so just follow signs. It is step free all the way. It will probably end up being quicker than heading to Paddington, and cheaper too.

St. Pancras and Kings Cross are literally across the street from each other and share a tube station. No steps. You change levels either by escalator or elevator. Not really much walking. Less than 5 minutes.

You will walk much more at Paddington.

A taxi from St. Pancras to Heathrow will run you over 100 GBP. If you don't mind spending that, then take a taxi. It's the most comfortable. You get to see London traffic and watch the meter add up.

It also depends on how much luggage you have.

As a solo traveler, the easiest route is the Tube. There are elevators at St Pancras/Kings Cross. Depending the time of day you may have to stand but I doubt it. I always take the Tube to Heathrow, it's the easiest/cheapest way.

Your guide to public transport in London is:
https://tfl.gov.uk/
Directions, stations, fares etc. all collected by this government ageny.

Google Maps does some of the same work although without as much information on cost.

tfl will always tell you by default the fastest route for a journey, in this case HEX (and the most expensive), unless you change the settings, so to get the tube route you have to untick all the various other options.
On that basis, unless you have a good idea in the first place, where and by what means you want to get there, it often offers some pretty strange options.

I appreciate all the replies, especially knowing it is easy to get from St. Pancras to Kings's Cross that doesn't involve a lot of walking and stairs. I knew how close they were but was not familiar with how easy it was to get from Eurostar to the tube without a lot of walking. I certainly will consider taking the tube from there to LHR.
I am traveling on a Saturday, with one carry-on suitcase. Want to arrive in Terminal 2 or as close as I can get.
Thank you All!

The stations for the Piccadilly line, Elizabeth line and HEX are between Terminals 2 & 3. It's a 5 minute walk to either Terminal via inderground walkway.

If you are staying at the Hilton Garden Inn, the entrance is in the T2 parking garage. No signs until you get to the entrance of the garage.