Series Fares in India: How IATA Travel Agents Actually Buy Pre-Blocked Airline Seats
By Kabir Malhotra (Kabir Malhotra writes about how Indian travel buyers actually pay — UPI vs credit card vs forex card surcharges, reward-point math on the top travel credit cards, RBI tokenisation, EMI-on-flights and the small fees that compound across a year of bookings.) · Published · 11 min read
Series fares are one of those travel industry terms that gets thrown around confidently but rarely explained clearly. If you've ever wondered how a local travel agent quotes you a price that seems lower than what you see on MakeMyTrip, series fares and pre-blocked seat allotments are often the answer.
TL;DR — What Series Fares Actually Are
Series fares are pre-negotiated, bulk airline fares that IATA-accredited travel agents secure directly from airlines — typically for a specific set of flights over a defined season. The agent commits to buying a block of seats (say, 20 seats on every Monday and Thursday departure on a given route for 3 months), and in return gets a lower per-seat price than what's available in the open retail market. These are different from one-off group bookings — they're recurring, scheduled allotments. If you're a travel agent looking to serve corporate clients or package-tour operators efficiently, understanding series fares is essential. If you're a traveller, knowing they exist explains why agent-quoted prices are sometimes genuinely lower.
Group Fares vs Series Fares: What's the Difference?
These two terms get conflated constantly, including by people in the industry. They're related but distinct.
Group fares are one-time allocations. An agent or corporate buyer approaches an airline and says: 'I need 25 seats on flight 6E 456 on 14 October.' The airline quotes a group fare for that specific booking. Once those passengers have flown, the transaction is complete.
Series fares are recurring. The agent says: 'I need 15 seats per week on the Mumbai–Goa route every Saturday morning, for the next 6 months.' The airline allocates that block as a series — the same seats, the same flights, week after week. The agent takes on the commitment to fill those seats (or pay for them even if they don't) in exchange for a significantly discounted per-seat rate.
The risk-reward dynamic is very different. Group fares have lower commitment but less discount. Series fares have higher commitment (you're on the hook for seats even if you can't fill them) but can deliver meaningfully lower per-seat pricing. For a well-established agency with a steady flow of traffic on a specific route — say, a Rajasthan tour operator who fills weekend Jaipur–Mumbai flights — series fares can be the backbone of the business.
How Airlines Actually Manage Seat Allotments
Airlines are constantly balancing between how many seats to sell in the open retail market (through their own website, GDS, OTAs) versus how many to allocate through allotment agreements with agents.
The allotment model works roughly like this: before a season begins (typically defined as IATA's summer schedule — late March to late October — and winter schedule — late October to late March), airlines negotiate with key agency partners about how many seats to allocate on specific flights. These allocations are loaded into the airline's reservations system.
The agent has a release window — a date by which they must confirm how many of the allocated seats they're actually using. Before the release date, the agent can sell, hold, or release seats flexibly. After the release date, unsold seats revert to the airline for general sale. The agent is responsible for the committed seats they haven't released.
For the agent, the advantage is inventory security — they know they have seats on popular flights even when the general market is sold out. For the airline, the advantage is guaranteed revenue commitment and reduced distribution costs (fewer seats going through GDS, which charges booking fees).
Which Domestic India Routes Have Active Series Fare Allotments?
Not every route has meaningful series fare activity. The routes that attract allotment interest are typically those with a combination of high demand, strong agent distribution channels, and package-tour relevance. Based on current market patterns:
- Metro to Goa: Mumbai–Goa and Delhi–Goa are perennial series fare routes. Wedding groups, New Year packages, long-weekend escapes — agencies that serve these markets often hold seasonal series allotments on morning and evening Goa frequencies.
- North India leisure routes: Delhi–Udaipur, Delhi–Jaipur, Delhi–Leh (highly seasonal), and Delhi–Varanasi see allotment activity from tour operators running Rajasthan and religious-circuit packages.
- South India routes: Bangalore–Hyderabad, Chennai–Kochi, and the southern metros to Andaman (though Andaman has limited capacity).
- Pilgrimage routes: Seasonal routes to Varanasi, Tirupati, and connecting airports for Char Dham — tour operators often block series on these during peak pilgrimage windows.
Routes with very low frequency or limited airline competition (some Tier-2 city sectors) rarely have series allotments because there simply isn't enough capacity to carve out allotments while keeping the general market viable.
For route-by-route schedule and frequency data, FlightGPT's route pages show which carriers operate each sector and how many daily departures there are — useful context for understanding where allotment economics make sense.
How Agents Access Series Fares: The Channel Mechanics
Series fares are not visible on any consumer platform — not MakeMyTrip, not the airline's own website, not Skyscanner. They exist in bilateral commercial agreements between airlines and accredited agents.
There are a few channels through which agents access them:
Direct airline contracts: Large agencies with significant volume on a specific carrier negotiate directly with the airline's commercial/group sales team. These deals are relationship-driven and renewal cycles typically align with IATA schedule seasons.
GDS-loaded allotments: Some airlines load their agent allotments through GDS systems (Sabre, Amadeus, Galileo). An IATA agent with GDS access can see and book allotment seats directly in the GDS. This is more common with international carriers; domestic Indian carriers have been reducing GDS distribution in favour of direct-API integrations.
BSP (Billing and Settlement Plan): IATA agents in India settle payments through BSP, administered by IATA. Series fares booked through official channels are typically settled through BSP, which gives the airline confidence in payment and gives the agent a consolidated billing relationship.
Consolidators: Not every small agency has the volume to negotiate series fares directly. Consolidators are larger B2B operators that buy allotments from airlines and resell them to smaller agencies at net fares. The smaller agency then marks up and sells to end customers. This tiered model is common in India's fragmented travel agency market.
If you're a travel coordinator managing corporate group bookings and want access to B2B pricing without full IATA accreditation, the FlightGPT Partner portal is designed for exactly this use case — worth exploring if you're doing regular volume.
The Release Window: The Hidden Risk Agents Carry
The release window is the most misunderstood — and most consequential — element of a series fare arrangement. Here's how it typically works:
Suppose an agency holds 20 seats per week on a route as part of a series allotment, and the release window is 21 days before each departure. That means:
- Up to 21 days before departure, the agent can sell seats to customers, hold them for confirmed clients, or release unused seats back to the airline.
- At the 21-day mark (the release date), the agent must 'release' any seats they aren't selling. After this point, those seats revert to general sale.
- Seats the agent still has after the release window (seats they've committed to but haven't sold) become their financial liability — they pay for them whether or not a customer actually flies.
This is the core commercial risk of series fares. An agency that over-commits — takes more seats than it can reliably fill — ends up paying for empty seats. Over a 6-month season, that can add up to a significant loss. Well-run agencies size their series commitments conservatively, based on their demonstrated ability to fill seats on specific flights in specific seasons.
The flip side: an agency that manages release windows well has a significant advantage. They can guarantee inventory to corporate clients even when flights are selling out on retail channels, because their pre-committed seats are in the allotment, not in general inventory.
What This Means If You're a Traveller (Not an Agent)
If you're booking through a local travel agent and they quote you a price that's noticeably lower than what you see on FlightGPT or the airline's own site, series fares or a group allotment are often the explanation. The agent has pre-purchased seats at a wholesale rate and is selling them to you at a markup that's still below the retail price you'd pay direct.
This isn't a scam — it's how wholesale travel has always worked. The agent is taking the inventory risk; you get a lower fare.
The practical implication for travellers: on popular routes, well-connected local agents sometimes have access to seats even when the airline's own website shows 'sold out' or very high prices. If a flight looks unavailable or extremely expensive on retail channels, it's worth a call to an established agency that operates on your route — they may have allotment seats.
Conversely, if you're comparing an agent's group fare quote against what you see on a metasearch like FlightGPT, you're not comparing like-for-like. The retail fare on the search results includes margin for OTAs and the airline's distribution costs. A direct series fare quote from an agent may legitimately be cheaper — or it may look cheaper but exclude taxes and fees. Always ask for a total all-inclusive price to compare correctly.
Frequently asked questions
What are series fares in Indian aviation?
Series fares are recurring, pre-negotiated airline fares that IATA-accredited travel agents secure for a block of seats on specific flights over a defined season — typically an IATA schedule season (roughly 6 months). Unlike a one-time group booking, a series allotment gives the agent the same seats on the same flights week after week, at a lower per-seat rate than the retail market, in exchange for committing to fill those seats or pay for them regardless.
How do I access series fares as a travel agent in India?
You need IATA accreditation and BSP access to negotiate series fares directly with airlines, or you can access wholesale allotment pricing through a consolidator — a larger B2B operator that buys series allotments and resells to smaller agencies. The direct-airline route requires a track record of volume and a formal commercial relationship with the airline's group or commercial sales desk. See our companion guide on <a href='/blog/iata-accreditation-india-travel-agent-group-fares-how-to'>becoming IATA-accredited in India</a> for the full requirements.
Which airlines offer series fares to agents in India?
IndiGo and Air India are the two carriers with the most active allotment programmes for domestic India routes. Air India Express offers similar programmes on its sectors. Akasa Air is newer but has been building out B2B agent relationships. SpiceJet has had allotment programmes historically, but given its current operational situation, verify availability directly. Exact terms and which routes have allotments vary by season and by the agency's volume relationship with the carrier.
What is the release window for series fare allotments?
The release window is the date before a departure by which an agent must confirm how many of their allotted seats they're actually using. Unused seats before the release date revert to general sale and the agent has no liability for them. Unsold seats after the release window become the agent's financial responsibility. A typical domestic release window is around 21 days before departure, but this varies by carrier and by the specific allotment contract.
Can travellers access series fares directly?
No. Series fares are a B2B wholesale product and are not available on consumer booking sites — not on airline websites, OTAs, or metasearch platforms. Travellers access the benefit indirectly by booking through an agent who holds an allotment. If an agent quotes you a fare noticeably below what you see on retail channels for a popular route, a series allotment is the most likely explanation.
Do series fares exist for international routes out of India?
Yes, and international series fares are actually more established than domestic ones — the consolidator model for long-haul international (particularly on India-Middle East, India-UK, India-Southeast Asia corridors) is well-developed. Indian agents who specialise in outbound travel often have series allotments or consolidator-priced inventory on high-volume international routes. The economics are similar: bulk commitment in exchange for a lower net fare.