Travel Budget and quick Travel from London to Mt Titlis and from Lucern to Paris.

There is nothing budget about Switzerland!

Check Skyscanner for flights. Schedules for April have been available for months and prices only head one way. Mid April means school holidays, so flights will be more expensive around this time.

No one property will be close to all the sights that you want to see as they will be spread out, but check Booking.com, Trip Advisor rentals and VRBO for central accommodation.

The way this is worded makes me wonder if the poster is misunderstanding the nature of the forum? The forum is just a group of frequent travelers helping each other out, not a travel agency. I'm not intending to be unkind, people will try to help, it just might be good to clarify that you understand where the information comes from. I stayed in Luzern for three nights at Drei Koenig. It is a budget friendly property with family rooms. An extensive breakfast is included in the rate. I did not go to Titlis, I went to Rigi. When I was there I went back to Paris via train after stopping in Geneva. For you, its just a guess, but I'm thinking you could take a train from Luzern to Zurich to Paris, about 4-5 hours. For economy, I think this is a ticket you would want to purchase in advance (like 2-3 months) for the best price.

Where are you planning to stay? I doubt you are wanting to travel London to the top of Titlis and staying there.
I would guess you are staying in Luzern, it is the obvious choice.

• London --> Luzern - Fly to Zürich, lots of options from different London airports. Train from Zürich airport to Luzern (70 minutes)
• Luzern <--> Titlis - Train to Engelberg (at the bottom of Titlis), then cable cars up. See: https://titlis.ch/en
• Luzern --> Paris - By train. Note you DO NOT go via Zürich. The shortest route is Luzern - Basel - Paris

For hotels in Luzern, see the official tourist site: https://www.luzern.com/en/

P.S. I am not sure what you mean by "ZHR", if you mean Zürich airport, that is ZRH