There are multipal ways to reach Delhi, it can either be by Air, by road or by rail
Delhi's Indira Gandhi International Airport is a big airport handling more than 40 million people annualy. It is very well connected to almost every part of the glob, the T-3 terminal caters to international arrival and departures. It is world's 17th most busiest airport. The terminal T-1 earlier called palam airport handles the domestic low cost flights. There is another terminal T-2 which is also used for domestic flights presently due to covid situations the T-2 terminal is temporalily closed so Delhi is very well connected to all parts of India by direct flights. Internationally also Delhi is very well connected with all the countries.
Delhi has an excellent network of highways connecting it with all the parts of India there are a total of seven highways crossing the city if Delhi.
National Highway No.1 - This highway connects Delhi with Northen states of Haryana and Punjab, futhure connecting with Himachal and Jammu Kashmir. This is very old highway predating the Mughal times, It was part of the king Shershah Suri's Grand Trunk Road connecting Bengal with the Northen most part of then India (Now in Pakistan). Today this highway goes right up to Amritsar- Atari from Delhi recently this highway has been transformed into a six lane highway.
National Highway No.8 - It is one of the most busy highway of the nation connecting Delhi with Mumbai en-route Jaipur, Ahmedabad, Vadodra, Surat. This Highway is used to travel to jaipur it's an excellent four lane highway
National Highway No.10 - This highway connects town of Fazilka in Punjab with Delhi running through state of Haryana, futhere northen parts of Rajasthan can be easily accessed through this highway it is around 400 kilometer in length.
National Highway No.2- This is also most important and one most busiest highway of India. It connects Delhi with Kolkata via Agra, Kanpur, Prayagraj, Varanasi. This highway connects very well known tourist destinations of Varanasi and Agra with Delhi. At some stretches the highway is an excellent six lane highway while work is on at other stretches.
Delhi-Noida- Greater Noida Expressway- Connecting Delhi through a bridge called D.N.D, this highway is an excellent 24 kilometers express way going all the way to Greater Noida via Noida. The most important aspect of this highway is its connectivity with Yamuna express way- to Agra. Yamuna express way is the state of the art toll way connecting Greater Noida with Agra, its eight lane highway covering a distance of 165 kilometers. This highway futhere connects to the Agra Lucknow express way at Agra.
Delhi-Gurugram Express way - There was a time when commuting between Delhi and Gurugram took more than 2 hours with commissioning of this express way in early 2000, it now takes hardly half an hour to travel the same, futhere it connects with national highway 8
Natinal Highway 24 - Work has been going on on this highway making it broad and fast, this connects Delhi with Lucknow anothe extension links Delhi with Merut.
All the North Indian states have an excellent system of public bus transport these buses connect Delhi with important of North India like Agra, Jaipur, Ludhiana, Amritsar, Chandigarh etc. You can even catch buses for cities of Himachal and jammu Kashmir. There are three Interstate bus terminal in Delhi.
Interstate Bus Terminal Kashmiri Gate(ISBT) - Recenlty upgraded this bus terminal caters to buses coming from Northen state of Haryana, Punjab, Himachal and Jammu Kashmir, apart from the normal busse you can also avail services of super luxury Volvo buses to cities like Amritsar, Chandigarh, Jammu etc. There are buses departing every minute at this very busy bus station. This is the busiest bus station of Delhi.
Interstate Bus Terminal Sarai Kale Khan - Located at walking distance from Hazrat Nizammudin ralway station connects Delhi with Madhya Pradesh and Rajasthan
Interstate Bus Terminal Anand Vihar - This is the only bus terminal operating from the other side of Yamuna river. It connects state of UP, Uttarakhand, Bihar with Delhi
Delhi is a very important nodal center of India Raliways. Threre are more than 48 small and large railway stations of Indian railways in Delhi region. The railways station Nwe Delhi is the largest and busiest railway station of Delhi, more than a dozen railway platforms. train arriving and departing every other minut make New Delhi very busy railway station. This railway station is connected to almost entire India. There are multiple trains in a day from New Delhi Railway station to Northen cities of Amritsar and Jammu. Even far of station like Chennai central have a very good connectivity with Delhi. Delhi is connected with South, South east, south west, North east, western parts of India. Recently to decongest the New Delhi railway stations many trains have been diverted to stations like Hazrat Nizammudin, Anand Vihat terminal of Indian Railway. The famous shatabdi express train from New Delhi to Bhopal was inaugrated over here in year 1987. This was the centenary celebration year of the birthday of erstwhile Prime Minister Pt. Jawahar lal Nehru for years Shatabdi express was the most Important modern trains of India.