How to travel between Singapore and Kuala Lumpur?

Ill be in Singapore for vacation with my family of 4.Which is the best way of getting to Kuala Lumpur from Singapore?Should we book in advance or can we book on the spot?Which is the best-train or bus?Hiw much would it cost approx?any links would be helpful

I think about 30 SGD. You can take a bus by grassland tours or Five stars tours. Here's the website with everything you need.
http://www.myexpressbus.com/

By coach definitely. Go down to Golden Mile Complex to get your tickets, they have a dozen bus operators there. You can see pictures of their coaches before booking. Those priced between $30 to $40 has newer buses and provide smoother rides. Better to book in advance as seats are not unlimited, especially so for popular timeslots like Fri nights. The train ride takes twice as long and is uncomfortable too as the trains are really old.

Train
I have just answered 1 question-How much time does it take from Singapore to Kuala Lumpur by train?Please take a look at the Yahoo/Answer-Singapore!

Singapore-Kuala Lumpur takes 6 hours on one of two modern daytime trains or 8 hours on a time-effective overnight sleeper train.Please check website for train schedule.

Singapore - Kuala Lumpur :
2nd class seat About RM 34 (About $10.00)
1st class seat About RM 68 (About $21.00)
2nd class sleeper About RM 43 (About $11.00)
1st class sleeper About RM 86 (About $20.00)
Deluxe sleeper,shower & WC About RM 131 (About $38.00) sharing,About RM 180 (About $54.00) sole occupancy.

When checking fares (or booking online) at www.ktmb.com.my,classes & class codes are as follows:

AFC = 1st class seats (also known as "Premier")

ASC = 2nd class seats (also known as "Superior")

AEC = 3rd class seats (also known as "Economy")

ADNS = 2nd class sleeper (also known as "Superior Night")

2PLUS = 1st class sleeper (also known as "Premier Night Standard")

ADNF = deluxe 'Selesa' sleeper with private shower & toilet (also known as "Premier Night Deluxe")

Do I need a reservation..?
Yes,you do.All long-distance trains in Malaysia are 'reservation compulsory',so you will need a seat or berth reservation for each train you take.Reservations open 60 days before departure.

Bus
Singapore - Kuala Lumpur
About 5hrs -subject to traffic jam.
1) First Coach

Novena Square
#02-33 238
Thomson Road
(next to Novena MRT station & opposite Tan Tock Seng Hospital)
Tel: 68 222 111
Departure : Daily 7.30am 9.30am 11.30am 2.30pm 4.30pm 6.30pm
Price : About S$30.00

2) Aeroline Coach Service (Double Decker)
Grand Copthorne Water Front Hotel
Tel: 6733 7010,6341 9338,6341 9368
Open : Daily : 8.30am - 6.00pm
www.aeroline.com.sg

Departure : Mon - Fri
8.00am 9.00am 10.00am 3.30pm 6.45pm
Sat - Sun
8.00am 9.00am 10.00am 3.30pm 6.00pm
Price : About S$47.00
Corus Hotel
Jalan Ampang

Departure : Mon - Sun
10.00am 4.00pm 5.30pm
Price : About S$47.00
Menara Axis No 2
Jalan 51A/223 (opposite Armada)

3) Airebus (Business Class)
Suntec City
Level 1 (Adjacent to Cheers/Tasty Treatz Food Court)
3 Temasek Boulevard
Suntec Tower Four
Departure : Daily 8.00am 2.00pm 8.00pm
www.airebus.net

Upper/Lower Deck
Royal
Price : AboutSGD 69.00

Premier
Price : About SGD 65.00

Deluxe
Price : About SGD 63.00

4) Airebus (Executive Class)
DFS Galleria Scottswalk
(Adjacent to Royal Plaza @ Scotts)
25 Scotts Road
Tel : 6737 6535
Open : Daily 11:00am to 7.00pm
www.airebus.net

Sunway Lagoon Resort Hotel
& Adjacent to Cititel Hotel Mid
Valley City

Upper Deck
Price : About SGD 47.00

Lower Deck
Price : About SGD 47.00 + SGD2 surcharge

5) Nice ++ Bus Services (with individual TV screens)
Copthorne Orchid Hotel
214 Dunearn Road
Tel : 6256 5775
Departure : Daily 8.30am 9.30am
Price : About S$55.00
Old Railway Station
http://www.plusliner.com

6) Transnasional Coach Services
Singapore Lavender Street
Departure : Daily 8.30am 10.00am 12.00nn 1.30pm 3.00pm 5.00pm 8.00pm 11.00pm
Economy Coach
Price : About S$14.95 /AboutRM30.00
Puduraya Bus Station

Executive Coach
Departure : Daily 9.00am 11.00am 4.30pm 6.30pm
Price About S$30.00 /About RM60.00
http://www.nadi.com.my/

7) Grassland Express
5001 Beach Road
#01-26
Golden Mile Complex
Tel : 6293 1166
Departure : 7.45 am 9.00 am 9.45 am 12.00 noon 3.30 pm 5.30 pm 7.00 pm 9.00 pm 9.45 pm
Super VIP Coach
Price : About S$30.00

Departure : 7.00 am 8.15 am 10.45 am 2.30 pm 11.30 pm 8.30 am 3.30 pm 11.00 pm
Royal VIP Coach
Price : About S$42.00

8) Gunung Raya Express
Boon Lay
Tel : 6261 7811
Departure : Daily 8.30am 3.30pm 10.00pm
Price : About S$25.00
Pasar Rakyat No 8 Jalan Melati off Jalan Imbi/Tun Razak

9) Transtar Coach
Lavender MRT Station/Golden Mile Complex
Tel : 6299 9009
Departure : Daily
0730hrs (SVP/EXE)
0830hrs (FCL)
0930hrs (FCL)
1030hrs (EXE)
1500hrs (PRE)
1630hrs (FCL)
1830hrs (FCL)
2200hrs (SVP)

SVP = SuperVIP

EXE = Executive

FCL = First Class

PRE = Premium

SuperVIP
Price :About S$25.00

Executive
Price : About S$38.00

First Class
Price : About S$58.00

Premium
Price : About S$45,00
Transtar First Class Passenger's Lounge
No 10 Ground Floor
Jalan Melati off Jalan Imbi / Jalan Tun Razak
http://www.transtar.com.sg

10) Konsortium Express
Golden Mile Tower
Tel : 6392 3911
Boon Lay Shopping Centre
Tel : 6262 641
Departure : Sunday-Thursday 8pm
Price : About S$34.00
Departure : Fri -Sat 8pm
Price : About S$39.00
http://www.konsortium.com.sg

Please Note: Changes to fares & time schedules are at the discretion of the bus/coach operators.