Booking a Delhi to Mumbai flight on BookMyJet doesn't take long. Business trip, holiday, or something that came up at short notice — you'll find options that work and can book the whole thing online. It's a short process on BookMyJet. Put Delhi (DEL) in the From box and Mumbai (BOM) in the To box. Add your date and how many people are flying. Hit search. You'll get a list. Timings, duration, fare — all on one screen. Pick what fits. Next comes passenger details. Type the names the way they're printed on your ID. Not the short version you use, not the spelling your family uses. Exactly what's on the card. People get stuck at the counter over this more than anything else. Before you pay, look at the review page properly. Fare breakup, baggage, cancellation rules. These change from one fare to the next. The cheapest one on the list is usually the one you can't touch once it's booked. If your travel date might move, pay a bit more and get a fare you can change. Then pay. Confirmation and ticket details reach you on email and SMS. Delhi–Mumbai runs all day, so you have room to choose. Early morning flights go first, usually the 6 to 8 am ones. Book three or four days ahead and you'll pay less than you would at the airport counter.