Airlines Compared

1. IndiGo (Low-Cost Carrier)
Fare: One-way fares ranging from ₹9,600–₹10,300 from Delhi to Singapore

Stops/Routes: Generally nonstop (~6 h 10 m), some routed through hubs (~10–16 h with one stop).
Food & Service:
Bare-bones service: free nuts, water, hot beverages.
No ovens onboard ⇒ no hot meals unless pre-ordered; instant noodles, upma, sandwiches for sale
en.wikipedia.org,reddit.com

No in-flight entertainment; Hello 6E magazine only.

2. Air India (Full-Service Carrier post‑Merger with Vistara)
Fare: Nonstop one-ways around ₹11,700–₹13,500; flexible pricing, usually around ₹12–13 k .
Stops/Routes: Primarily nonstop (~5 h 50 m–6 h 10 m). Some operate one-stop variants for cheaper fares (~10–16 h including layover)
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momondo.in
makemytrip.global
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Food & Service:
Free multi-course hot meals, tea/coffee even on short flights

Seat-back screens featuring IFE, and free Wi‑Fi onboard newer A350/A321neo/B787 fleet

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Cabin comfort is better, and seat-space typically exceeds low-cost competition

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MIXED overall reviews: improved crew experience and food ("amazed me"), yet some older planes still have worn seats or malfunctioning entertainment .
Baggage: Economy has 25–30 kg checked + cabin 7 kg; upsizes with higher fare buckets .
3. Singapore Airlines (Premium Carrier)
Fare: Typically highest; expect ₹20 k+ for one-way economy or PREMIUM ECONOMY depending on route.
Stops/Routes: Nonstop on Boeing 777/A380 usually in ~5 h 45 m to 6 h range.
Food & Service:
Full hot meals served: local "hawker" fare such as Hainanese chicken rice, satay, bak chor mee even in economy through "Popular Local Fare" program cleartrip.com

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Premium cabins have "Book the Cook", seatback IFE, bigger seats, high-service quality, free Wi‑Fi (selected routes).
Well known for excellent service; could be recommended for comfort if affordable en.wikipedia.org.
Quick Comparison Table
Airline\tPrice (One‑Way, Economy)\tNon‑Stop?\tFood\tExtras\tService / Comfort
IndiGo\t₹9.6 k–₹10.3 k\tYes (~6 h)\tBuy-on-board; nuts, drinks, instant meals\tNone (IFE mag only)\tBasic, efficient, hard seats
Air India\t₹11.7 k–₹13.5 k\tYes (~5 h 50 m)\tComplimentary hot meals, tea/coffee\tIFE, Wi‑Fi, 25–30 kg baggage\tFull-service, improving cabins
Singapore Airlines\t₹20 k+\tYes (~5 h 45 m)\tHighest quality; local cuisine across classes\tIFE, meals, Wi‑Fi (select)\tPremium service, spacious seats
Passenger Feedback Highlights
IndiGo:
"Pleasant experience… efficient"

"Barely any cushion… no food unless bought"
reddit.com
Air India:
"Complimentary dinner… amazed me a lot… proper seats, USB ports, inflight wifi"
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"Singapore Airlines all the way even if you have to shell out double." (in terms of comfort preference)
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\ Which One is Best for You?
Budget-friendly & comfortable with no frills? → IndiGo: cheapest, but carry snacks, expect minimal comfort.
Seek better service without the premium price? → Air India: hot meal, IFE, Wi-Fi, acceptable comfort around ₹12–13 k.
More on the premium comfort & grub? → Singapore Airlines: roomy seating, gourmet meal—even in economy—but at ~₹20 k+.
✅ Next Steps
Choose your highest priority:
Price? → IndiGo
Comfort & food? → Air India
Premium class? → Singapore Airlines
Verify date prices exact (they change; IndiGo lowest in July; Air India occasionally ~₹8k if booked well in advance)

Book 1–2 months in advance, ideally mid-week (Tues/Wed) for best prices.
Pre-book meal or seat choice on low-cost airlines to enhance comfort if required.