The cheapest way to reach Kedarnath from New Delhi is to take Ddn Janshtbdi from New Delhi to Haridwar then take State Transport Bus from Haridwar to Kedarnath.
The fastest way to reach Kedarnath from New Delhi is to take Flight from New Delhi to Dehradun then take a taxi from Dehradun to Kedarnath
You can visit Kedarnath temple, Chorabari Tal, Chorabari Glacier, Bhairavnath Temple
From Delhi you have to take train to Haridwar after reached there you can hire a taxi or also state transport bus are runs everyday from Haridwar to Kedarnath this is the cheapest way to reach kedarnath.
So very few people know there is s bus runs daily around 9 to Guptkashi, bus does not have the fix time so it can arrive anytime between 8 to 9:30 which halts for 1 hour in shrinagar U.K cost is 650 around and takes 13 to 15 hrs to reach.
From Guptkashi to gaurikund( last motorable road) takes 1.5 hrs then trek starts from there total 19 kmt. Stay- you will find dorms and hotels and dharamshala types normal rooms starting to 250 to 2500 Food- Depends where you stay there economical buffet for Rs.150 Places- Chorabaro Tall is beautiful P.S- I have done this trek last year on last moment just before closing ceremony on akshyatirtiya within 4 days