Need suggestion for London and Paris Itinerary 12 nights

The best way to travel between Paris and London is the Eurostar train, which takes about 2 1/2 hours, plus checking in at least half an hour before departure. Right now they're quoting a $274 one-way total fare for two adults and two teens for a random late-May date. That's a non-refundable fare, and it will go up in the coming weeks and months. Nothing else compares to the Eurostar for speed and convenience. You're wise to fly "open jaw," coming into one city and leaving from the other, which saves time and usually money.

Unlike many posters, you're giving each city enough time to explore and enjoy it. Both offer many choices, depending on your interests. I suggest getting some guidebooks from the library (Rick Steves has excellent guides to both cities, but there re others), and basing your list on what appeals to you most. You could start with the "Explore Europe" tab in this website and click to London and Paris.

Planning a family trip with teens may involve compromises, and perhaps some days when two of you go one way and the other two another. Your kids are old enough to put their own choices into the mix, and they'll enjoy the trip more if they participate in planning it. You might let each family member plan one day for the things they most want to see and do.

We always fly into and back to the US from London Heathrow (LHR). We spend 3 nights in London then take the Eurostar over to Paris. Tickets for the Eurostar go on sale 6 months prior to your travel date and are quite cheap. They go up substantially the longer you wait to buy them so yours have been on sale since late December. Better get moving on those. LHR is much more user-friendly than CDG in our experience. We then spend maybe 7-8 nights in Paris, return to London for the remainder of our time and fly home from LHR. Some tout flying open jaw but we've never found that to be something we liked and we like to begin and end in London. You can go to www.tripadvisor.com and read the postings on both the London forum and the Paris forum, which are specific for those cities. We go every year and enjoy both cities immensely. I don't know what events are scheduled for your dates but no doubt you can find out on those forums. May 8 is VE Day that celebrates the end of World War II, and there are loads of things to enjoy in the spring from street markets, theater offerings, concerts in parks and in churches, and the Royal Albert Hall. All the famous sights have websites. We use guidebooks for each city before we go and they are all full of useful information. The TA forums also have lots of search items on site.

Good luck,

George

It looks like you have moved away from your previous itinerary idea (with Switzerland and/or Italy). For some day planning ideas, see these two articles. They have a pretty heavy focus on great museums (many of which are free in London or covered by a Paris Museum Pass in that city - only adults need the pass).

https://www.ricksteves.com/watch-read-listen/read/articles/paris-itinerary

https://www.ricksteves.com/europe/england/london-itinerary

Some particularly easy daytrips from London include Bath by train, Stonehenge by coach tour (can include Bath), or Cambridge or Brighton by train.

Thank you all for the suggestions. Laura thank you very much for the day view itinerary for each city and the sight seen. Now my plan mostly going to be finalize as per below.

arriving London on 28 May noon(overnight stay)
29 May London
30 May London
31 May London to Paris via Eurstar train Morning
1st June Paris
2nd June Paris
3rd June Paris
4th June Paris to Switzerland -Berner Oberland Via train (Need suggestion for train and destination in Berner Oberland to stay which should be centrally located and easy to cover surrounding attraction. Suggestion for attractions. we want to stay 2 night there)
5th June Berner Oberland
6th June Mt.titlis (where to stay and how to reach there from Berner Oberland
7th June Zurich (suggestion for main attraction in Zurich
8th Flight from Zurich morning
From Paris to Switzerland i am flexible to revise my itinerary (For Switzerland)if my given itinerary would not workable so please suggest)

Once again Thank you so much for the time and inuts.
Nitu

Since most of your time is being spent in France, you might be better off re-posting in the France forum, if you haven't already.

I am planning a very similar trip for my husband and I, we are taking the Eurostar, we booked early so we got a good deal, that might be the best way for you to travel between the two cities. I haven't been to Paris yet, so I don't know which places would be the most fun!
I might suggest including the kinds of activities you know your kids are excited about, I guess that is kind of a vague and obvious comment. My brother took his kids on a day trip from London to a castle where a lot of Hogwarts scenes were filmed for Harry Potter. He said the kids (they were 10, 13, 15) loved it and there were a lot of fun things for them to do there. If your kids are into Harry Potter, you might look into some of the film locations to include in your visit.
I visited London for the first time when I was 12 and I loved loved loved it! I am pretty sure my life long passion for history started at the gates of the Tower of London. Some of my other favorites (and this is from the perspective of my 12 year old self's visit) The British Museum, Westminster Abbey, Windsor Castle, and the park at Kensington Palace. We also got discount tickets to see a west end show, truly fabulous! Enjoy some of the parks and outdoor fun if the weather is good! I hope your trip inspires your kids like my first visit to London did for me!

The Eurostar is definitely the best way to travel between London and Paris.

I'm SOOOO confused.

In your original post with all the many questions you showed 3 nights in London, 3 nights in Paris (way too short a time in either in my opinion) but now here in the breakdown post you say "12 nights" in the thread title, and say

In each city we have plan to stay 6 nights

but then you show the original plan from your original thread where you are back to the really fast see everything keep moving 3 nights, 2 full days in each of London and Paris.

What is really happening?