Singapore Airlines vs Air India 2026: Codeshare Partners Compared

Singapore Airlines owns 25.1 percent of Air India. The Vistara absorption into Air India on November 12, 2024 closed the prior Singapore Airlines-Tata Group joint venture and converted that stake into direct equity in the merged Air India entity. The companion codeshare expansion announced October 2024 added 11 Indian cities and 40 international destinations to the joint network, taking the combined weekly Singapore-to-India service from 14 flights to 56. This is the unusual airline comparison where the two carriers are equity partners, share extensive codeshare arrangements, and often fly the same routes on alternating metal. The booking decision is rarely whether to fly Singapore or Air India; it is which carrier’s specific aircraft and cabin flies your specific flight.

Short version: Singapore Airlines wins on cabin product consistency, on the Changi hub, on the new SIA 2026J business class launching end of Q2 2026, and on KrisFlyer’s deeper US credit card transfer paths. Air India wins on the only-Indian-flag-nonstop access to the US and Europe, on a more forgiving personal item (40 by 30 by 15 cm vs SIA’s 40 by 30 by 10), and on the Vihaan.AI fleet renewal that is materially improving Air India’s product through 2026 and 2027. For premium-cabin trips with consistent expectations, Singapore Airlines. For Indian-flag preference and the Maharaja Club ecosystem, Air India. For most actual bookings, the codeshare network means you can earn miles in either program regardless of which metal you fly.

What I weighed for this comparison

These carriers are functionally connected, so the criteria need to focus on the operating-experience differences rather than the alliance or partnership level:

• Equity-partner status and codeshare expansion, the structural 2024-2026 development that changes how to book
• Cabin product consistency, since SIA’s fleet is more uniform than Air India’s mid-renewal fleet
• Mumbai-Singapore as the head-to-head route, where both fly daily with different metal
• Cabin baggage rules, especially the personal-item depth gap where Air India is more forgiving
• Star Alliance loyalty program comparison, with KrisFlyer’s US card transfer paths versus Maharaja Club’s local-India strength
• Direct nonstop access from the US to India, where Air India is the only Indian-flag option
• The post-Vistara network footprint of the combined Singapore-Air India operation

The 2024 Vistara absorption changed this comparison

For most of the last decade, Singapore Airlines and Air India competed on the India-to-anywhere routes with Singapore Airlines doing most of its India volume via its joint-venture carrier Vistara. The Singapore Airlines-Tata Group joint venture that owned Vistara closed in November 2024 when Vistara was absorbed into Air India. The accounting result: Singapore Airlines exchanged its Vistara stake for a 25.1 percent stake in the merged Air India.

The operational result is the codeshare expansion. From October 27, 2024, Singapore Airlines and Air India added Bengaluru-Singapore and Chennai-Singapore to the codeshare network. SIA codeshares on Air India’s domestic flights between Delhi and Amritsar, Bengaluru, Coimbatore, Lucknow, and Varanasi. Between Mumbai and Ahmedabad, Amritsar, Bengaluru, Coimbatore, Goa, Jaipur, Kolkata, Lucknow, and Thiruvananthapuram. Between Kolkata and Guwahati. Combined Singapore-to-India weekly services rose from 14 to 56.

For a traveler booking a Singapore-Mumbai trip, this means you can earn KrisFlyer or Maharaja Club miles on either airline’s metal, depending on which code you book. The cabin you experience varies by aircraft, not by airline. Singapore Airlines’ Mumbai-Singapore route runs on Boeing 787-10 or Airbus A350-900 widebodies twice daily, with a seasonal A380 downgauge between late July and late August 2026.

This is not the case for most legacy-carrier comparisons. The Singapore-Air India comparison is structurally closer to a multi-fleet operation than a head-to-head competition.

Winner: structural relationship

Codeshare partnership / SIA holds 25.1% of Air India post-Vistara; not pure competitors

Winner: weekly Singapore-to-India services

Combined / 56 weekly services across both carriers' codeshare network as of 2024 expansion

Winner: fleet ownership relationship

Singapore Airlines / minority stake in Air India; structural alignment

Is Singapore Airlines or Air India better for the Mumbai-Singapore route?

Singapore Airlines on a 787-10 or A350-900 is the more predictable product. Air India varies by aircraft type. For a 5-hour 40-minute Mumbai-to-Singapore nonstop, the cabin product matters because the trip is short enough to feel a difference but long enough to need cabin comfort.

Singapore Airlines operates the route twice daily. The aircraft is 787-10 (the larger 787 with 337 seats in a 2-class layout) or A350-900 (with 303 seats in a 3-class layout). Business class on both aircraft is the 2013-era SIA Business product: 1-2-1 reverse-herringbone, 76-inch fully-flat bed, 18-inch HD touchscreen, and KrisWorld entertainment. This is the product being replaced by SIA 2026J starting end of Q2 2026, but for travel between now and mid-2026 the 2013J seat is what you fly. The seat has been refreshed but not redesigned since 2013.

Air India operates the route on a mix of Boeing 787-8 (some retrofitted, some not), 787-9 (the new factory-fresh aircraft inducted in late 2025), and Airbus A320-family for shorter sectors. The Boeing 787-9 business class is the new generation product with privacy enhancements. The retrofitted 787-8 (first delivered Delhi April 13, 2026) carries the new cabin too. Unretrofitted 787-8 and older 777 aircraft still fly the legacy Air India business class.

For consistency, Singapore Airlines wins. For peak product on a new Air India 787-9 with the new cabin, Air India can match or exceed SIA depending on the specific aircraft. The Vihaan.AI retrofit means Air India’s product quality is improving through 2026 and 2027, but it is variable.

The seasonal A380 downgauge on SIA Mumbai-Singapore (late July to late August 2026) shifts one of the two daily flights from A380 to 777-300ER, which still flies the SIA 2013J product but in a 2-2-2 configuration instead of 1-2-1.

Winner: cabin product consistency by aircraft

Singapore Airlines / uniform 2013J across 787-10 and A350-900 in 1-2-1

Winner: peak cabin product (best aircraft)

Tie / SIA 2013J vs Air India new 787-9 cabin; both are competitive

Winner: schedule frequency

Singapore Airlines / 2 daily Mumbai-Singapore nonstops

Winner: trajectory of cabin improvement

Air India / Vihaan.AI retrofit accelerating through 2026-2027

Carry-on baggage: small but real differences

Both airlines run 7 kg Economy carry-on limits (or 8 kg for Air India international), but the personal item rules diverge.

Singapore Airlines Economy: 7 kg total cabin bag at 55 by 40 by 20 cm (or 115 cm linear sum, whichever is more forgiving), plus a separate personal item at 40 by 30 by 10 cm. The 10 cm personal item depth is notably thin, matching AirAsia and Scoot at the slim-folio end of the spectrum. A typical small backpack at 5-8 inches deep does not fit this allowance unpacked; only a slim laptop bag or handbag clears the gate sizer.

Air India Economy: 7 kg on domestic flights, 8 kg on international flights at 55 by 40 by 20 cm carry-on, plus a personal item at 40 by 30 by 15 cm. The 5 cm extra depth on the personal item makes a real difference for travelers with a packed laptop backpack.

Practical effect: a traveler with a 7 kg roller and a 4 kg packed laptop backpack walks onto Air India without question on an international flight (8 kg cap on roller plus a separately-weighed 4 kg personal item). The same traveler on Singapore Airlines might fail at the gate if the personal item exceeds 10 cm depth.

For premium cabins, Singapore Airlines Business allows 2 carry-on pieces at 7 kg each plus a personal item. Air India Business allows 1 carry-on at 12 kg plus a personal item. The total weight is similar at 14-15 kg, but Singapore Airlines splits across two bags while Air India bundles into a single heavier piece.

Winner: personal item depth

Air India / 40 by 30 by 15 cm vs SIA's 40 by 30 by 10

Winner: international Economy carry-on weight

Air India / 8 kg vs SIA's 7 kg

Winner: premium cabin carry-on split

Singapore Airlines / 2 pieces at 7 kg each vs Air India's 1 piece at 12 kg

Winner: enforcement predictability

Singapore Airlines / Changi sizers are precise; Air India's enforcement varies by station

Is SIA or Air India better for the US-to-India routing?

Air India is the only Indian-flag option for nonstop US-to-India service. Singapore Airlines does not fly nonstop US-to-India; the routing requires a Singapore connection.

Air India operates nonstops from JFK, Newark, San Francisco, Chicago, and (newly) other US gateways to Delhi and Mumbai. The Vihaan.AI new aircraft (787-9 since late 2025, A350-1000 in 2026) increasingly fly these routes with the new cabin product. For a US-to-India direct routing, Air India is the operational choice unless you prefer a one-stop via Asia.

Singapore Airlines flies US-to-Singapore nonstop on the A350-900 ULR (the world’s longest commercial flights from Newark, JFK, San Francisco, and Los Angeles), then onward to Mumbai or Delhi on a 787-10 or A350-900. The total journey time is longer than a US-to-India direct flight, but the SIA cabin product on the US-to-Singapore leg is the best in commercial aviation for the long-haul portion.

For a traveler whose final destination is Mumbai or Delhi, the choice is direct (Air India) versus high-end connection (Singapore Airlines via Singapore). For a traveler combining a Singapore visit with the trip to India, Singapore Airlines via SIN-MUM or SIN-DEL is the natural routing.

Winner: US-to-India nonstop

Air India / the only Indian-flag nonstop option

Winner: US-to-Singapore-to-India connection

Singapore Airlines / A350 ULR US nonstops then onward; high-end cabin product

Winner: total trip time on the US-to-India routing

Air India / direct beats connection on time

Winner: cabin product on the long-haul portion

Singapore Airlines / A350 ULR is the world's longest commercial flight; SIA cabin is among the best globally

Is KrisFlyer or Maharaja Club the better loyalty program?

Different optimization for different traveler patterns.

KrisFlyer is Singapore Airlines’ frequent flyer program with four tiers (KrisFlyer Standard, Elite Silver, Elite Gold, PPS Club for Singapore Airlines specifically, plus Star Alliance Gold reciprocity). Miles validity is three years. US credit card transfer paths are deep: American Express Membership Rewards, Chase Ultimate Rewards, Citi ThankYou Points, and Capital One miles all transfer to KrisFlyer at competitive ratios. Best redemption value is on business class flights at roughly 2-4 cents per mile. Star Alliance partner award redemption spans 26 airlines including Air India.

Maharaja Club (Air India’s rebranded Flying Returns) launched its refresh in 2025 with revenue-based earning (6-10x points per 100 INR spent on Air India) and a four-tier structure (Red, Silver, Gold, Platinum, with Red as the no-status entry tier). Maharaja Club points never expire as long as the member flies Air India at least once every 24 months. Star Alliance partner redemption covers 25 airlines and 700+ destinations. US credit card transfer paths are thinner than KrisFlyer’s; the Air India card ecosystem is primarily Indian rather than American.

For a traveler doing US-Singapore-India trips, KrisFlyer is the more flexible US-side program. For a traveler doing India-domestic and Air India long-haul, Maharaja Club is the simpler local-India choice. Both are Star Alliance, so partner award math is shared across the alliance.

Winner: US credit card transfer paths

KrisFlyer / Amex, Chase, Citi, Capital One all transfer

Winner: points expiration grace period

Maharaja Club / never-expire if 1 Air India flight every 24 months

Winner: Star Alliance partner redemption value

Tie / both draw from the same alliance award charts

Winner: earning rate on home-airline metal

Maharaja Club / revenue-based 6-10x points per 100 INR is straightforward

Winner: premium cabin redemption flexibility

KrisFlyer / PPS Club tier and global Star Alliance prestige

Who should pick Singapore Airlines

• You are flying long-haul into Asia and want the high-end product (A380 Suites, A350 ULR Business, the new SIA 2026J launching end of Q2 2026)
• You collect KrisFlyer miles via US credit card transfers (Amex, Chase, Citi, Capital One)
• You want a connecting hub at Changi (consistently top-three Skytrax ranked for over a decade)
• You value cabin product consistency on a given aircraft type and route
• You are flying as a premium-cabin couple and want the A380 Suites double-bed configuration (unique to SIA Suites)
• You are doing a Singapore stopover en route to India or Southeast Asia
• You are booking the codeshare on a route where Air India metal does not fly the specific aircraft you want

Who should pick Air India

• You are flying nonstop from the US, UK, Europe, Australia, or Japan to India
• You can book the new Air India 787-9 or retrofitted 787-8 with the updated cabin product
• You collect Maharaja Club points and value the never-expire-with-one-flight-per-24-months policy
• You travel with a packed laptop backpack as a personal item (the 40 by 30 by 15 cm allowance is more forgiving than SIA’s 10 cm depth)
• You are an Indian-flag-airline preference traveler and value the Vihaan.AI rebuild story
• You can absorb the variability of Air India’s mid-renewal fleet (some retrofit, some legacy)
• You are using Maharaja Club’s local-India redemption mechanics for domestic Indian travel

The Bottom Line

Singapore Airlines and Air India are functionally partners after the 2024 Vistara absorption. Singapore Airlines holds 25.1 percent equity in Air India, the two carriers share extensive codeshare arrangements (56 weekly Singapore-to-India services across both networks), and the booking decision is often which metal flies your specific flight, not which airline. This is a different comparison shape than the typical legacy-vs-legacy or legacy-vs-ULCC matchup.

For premium-cabin travelers on the Singapore-to-India route, Singapore Airlines is the safer book. The 2013J product is consistent across the 787-10 and A350-900 fleet, the cabin is well-rated, and the upgrade to SIA 2026J end of Q2 2026 will further differentiate the SIA product. Air India’s cabin product varies by aircraft, with the new 787-9 and retrofitted 787-8 matching SIA on the route but unretrofitted aircraft falling behind.

For US-to-India nonstop, Air India is the only Indian-flag option. The Vihaan.AI fleet renewal is producing real product improvement, but the traveler experience is uneven through 2026 and 2027 until the retrofit completes.

For loyalty, KrisFlyer is the better global program with deeper US credit card transfer paths. Maharaja Club is the better local-India program with the never-expire grace period and revenue-based earning that rewards frequent Air India travel.

For carry-on, Air India is the more forgiving carrier on the personal item depth (15 cm vs SIA’s 10 cm). For premium cabin baggage, Singapore Airlines splits two 7 kg pieces while Air India bundles a 12 kg piece.

The codeshare network means many travelers can earn either airline’s miles on either airline’s metal. Pick KrisFlyer if you optimize for US-to-Asia long-haul redemption. Pick Maharaja Club if you optimize for Indian domestic + occasional Air India long-haul.

For more Asia-cohort context, see Singapore Airlines vs Cathay Pacific for the SIA-vs-CX premium comparison, or IndiGo vs Air India for the Indian domestic market choice. For the full per-airline baggage policies, see Singapore Airlines carry-on size and Air India carry-on size.