How to go from Heathrow Airport to Hammersmith Station by Public Transportation?

How much luggage do you have?

Define cheap.

IMHO just take a cab or Uber. After a flight no need to try to take the Tube.

The cheapest is to walk all the way, but that's not really feasible.

The Piccadilly line is £2.40 per adult (idk what the child rates are and when they age out) and goes directly to Hammersmith station in 32 minutes. A taxi or Uber would probably be £60+ and you would be subject to traffic.

Thank you so much.
This is very helpful. I take it we are able to buy tickets for the Piccadilly line on a US credit card pretty easily and it is not too complicated.

The Piccadilly Line goes from Heathrow to Hammersmith Station in just over 30 minutes with no changes.

It is part of the Underground/Tube network. You need to learn how to use this while visiting London as it is one of the easiest ways to get around.

You don't buy tickets. You tap in and out of the system. You can get an Oyster Card or use either a contactless credit card or your phone with Apple Pay/Google Pay. Each person must have their own form of payment but it could be on the same account. It is the cheapest way to go. The fare is 2.40 GBP per person and children under 11 ride for free. You can apply for a discounted Oyster photocard for kids 11-15

https://tfl.gov.uk/fares/free-and-discounted-travel/11-15-zip-oyster-photocard?intcmp=55575

I have traveled this route more times than I can count but I go past Hammersmith Station for a couple of stops. It's very easy.

I have always taken the tube to/from Heathrow, and its usually reasonable. But last time, I took one of the new lines, and I was surprised to find that our Oyster cards were emptied. In talking to staff, it turns out that this new line charges about twice as much as the old lines. It was not any fancier. I think the color code was purple if I recall. It probably saved one transfer, but I got to the same exact location years ago using the older lines. So just beware.

There may be a bus which would probably be even worse with luggage, but you can use the same Oyster card.

You can get an Oyster card from one of ticket machines - perhaps preloaded with 10L, and then you top if off as needed.

Just use google maps if your cell service is active, or you can look at maps in the station and figure it out.

The line RailRider is referring to is the Elizabeth Line (purple logo), which is a separate line from the Picadilly Line. It does cost more than the Picadilly Line, but is faster to central London. Your best bet for public transport to get to Hammersmith Station is stick to the Picadilly Line as it gets to you directly to Hammersmith Station with no transfers (you would need to transfer if you took the Elizabeth Line). The Picadilly Line takes about 33-37 minutes (according to Google Maps). A rough Uber quote is about 50 pounds, compared to 2.40GBP per person for the Picadilly Line.

"I have always taken the tube to/from Heathrow, and its usually reasonable. But last time, I took one of the new lines, and I was surprised to find that our Oyster cards were emptied."

The Elizabeth Line is not a tube line...

I used to live in Hammersmith and did this journey quite regularly- the easiest, fastest, and least expensive way is the Piccadilly line direct from Heathrow to Hammersmith, as others have mentioned.

You just need to buy one Oyster card, for your 14 year old which will cost £7 before you put money on it. This is so you can ask an official to apply their half price discount to it. The adults should just use their own individual debit/credit cards to tap in and out of the tube system at the entry and exit gates. Just stand back and watch the locals for a minute.
The gates are designed to let one person through at a time so use the wide gates at the ends for you and your younger child.
It's a direct route to Hammersmith from Heathrow, no changes. I've never used Heathrow but I believe that the tube does not stop at all Terminals, but there are other ways to travel between them. A regular may elaborate.
There are two stations at Hammersmith, one serviced by the Piccadilly and District lines, empty into a small indoor shopping mall.
Which is where you will emerge into your first taste of London.
The other station is a 50m across a busy shopping intersection and is served by the Circle and Hammersmith & City lines. This is quite common in London, but in the central area, changing between them is usually by underground walkways. So on your travels around London, bear in mind that the other station may be better if you are going to the northern part of Central London.
Travelling by tube for me is part of my holiday, I love it.

You do have to pay for 11 year olds. They’re only free until they turn 11. You can get a young traveller discount added to an Oyster card for each of your children which will give them half price travel.

I've never used Heathrow but I believe that the tube does not stop at all Terminals, but there are other ways to travel between them.

There are services from all terminals but there are two branches.

One does a loop from Hatton Cross -> T4 -> T2/3 then into London. You can't do this in reverse it is one way only.

The other does T5 -> T2/3 then London in both directions.

You don't need the Zip Oyster mentioned by Frank.
That is for locals! Unneeded faff.

If the child is UNDER 11 (that is not had their 11th birthday) they travel for free (if you are using Oyster). Ages 11 to 15 just buy a regular Oyster Card and ask any member of gateline staff to add Young Visitor Discount valid for 14 days.

TfL (the operator) say that the most economical method is for you to use Oyster cards and buy £1 off peak all zone day travelcards for each of the children.

Or you could get the Zip Oyster cards and the kids will have a unique souvenir.

In which terminal do you arrive?

There are two Piccadilly services. From Heathrow they both go into London.

One goes: London-T2/3-T5-T2/3-London

The other goes London-T4-T2/3-London

Unless you are going to Terminal 4 don't take this one. When it gets to T4, it sits for nine minutes before departing for T2/3.

Northerner here. This might sound like a daft question, but is there a Terminal 1 at Heathrow?

is there a Terminal 1 at Heathrow?

used to be.

defunct. stone dead. demised. ceased to be. bereft of life it rests in peace. pushing up the daisies.

not easily replaced by a slug. May be replaced at a pet shop in Bolton. or Notlob.

you might also search in vain for Platform 5 at Watford Junction. 1-4 for the Third Rail, 6 Down Fast, 7 Up Fast, 8 Down Slow, 9 Up Slow, 10 Bay, 11 Abbey Line

No 5.

you might also search in vain for Platform 5 at Watford Junction. 1-4 for the Third Rail, 6 Down Fast, 7 Up Fast, 8 Down Slow, 9 Up Slow, 10 Bay, 11 Abbey Line

No 5.

Nigel, are you sure it's not there? Perhaps it's there but you can't see it.

Think about it....what's the main reason tourists travel to Watford Junction? Perhaps Platform 5 is reserved the same way Platform 9 3/4 is reserved at Kings Crosss.

Platform 5 was the old tube platform from when the Bakerloo line got that far north. No longer needed it was removed at one of the route modernisations.