The nearest railhead is Kathgodam 34 Kms from Nainital.
The nearest Airport is New Delhi 300 kms from Nainital.
Another nearest raihead / airport is Lucknow 400 kms from Nainital.

Train No	Train Name	From	To	Departure
15014 DN/13 UP	Ranikhet Express	Kathgodam	Delhi	20:40
15036 DN/35 UP	Uttr Samprk Krant Exp.	Kathgodam	Delhi	08:50
13020 DN/19 UP	Bagh Express	Kathgodam	Howarah	21:55
14319 DN/20 UP	KGM DDN Express	Kathgodam	Dehradun	19:40
12039 DN/40 UP	Shatabdi Express	Kathgodam	Anand Vihar	15.45
12207 DN/08 UP	Garib Rath Exp.	Kathgodam	Jammu	18:30 (Tuesday Only)
15014 DN/13 UP	Corbett Link Exp.	Ramnagar	Delhi	21:10
15307 DN/06 UP	Nainital Link Exp.	Tanakpur	Lucknow	20:10
12210 DN/09 UP	Garib Rath Link Exp.	Kathgodam	Kanpur	18:30 (Monday Only)
12354 DN/53 UP	Kolkata Weekly	LalKuan	Howarah	06:35 (Sat. only)
52228 DN/29 UP	Nainital Exp.	Tanakpur	Aishbagh	18.40
Please check with the latest Railway time table

Important Bus schedule
Bus Name	Departure
Nainital to Rishikesh	5 AM
Nainital to Masuoorrie	5.30 AM
Nainital to Dehradoon	6.30 AM (via Ramnagar)
Nainital to Delhi	9 AM & 9.30 AM
Nainital to Agra	16.00 & 17.30 (2X2 Push Back Deluxe)
Nainital to Lucknow	17.00 (2X2 Push Back Deluxe)
Nainital to Dehradoon	18.00, 19.00, 19.30 & 20.00(2X2 Push Back Deluxe)
Nainital to Delhi	20.30 (2X2 Push Back Deluxe) & 21.30 (Volvo), 22.00 (AC Sleeper)