Mumbai CSMIA Airport Terminal Transfer Guide: T1 to T2 Free Shuttle Bus, Metro Line 3, Minimum Connection Times, and Baggage Rules (2026)

Quick Summary

• Primary Update: Chhatrapati Shivaji Maharaj International Airport (CSMIA) operates two geographically separated passenger terminals—Terminal 1 in Santacruz and Terminal 2 in Sahar—connected via complimentary 24/7 airport shuttle buses and the rapid underground Mumbai Metro Line 3 (Aqua Line).
• Transit Impact: Because T1 and T2 are separated by 5 kilometers of city road network and intersecting active runways, passengers cannot walk between terminals. Travelers on split tickets must collect all checked baggage, exit landside, transfer between Santacruz and Sahar, and re-check bags before strict airline cut-offs.
• Traveler Advice: Budget at least 3 hours for domestic-to-international transfers (T1 to T2) and 3.5 to 4 hours for international-to-domestic transfers (T2 to T1) due to mandatory Indian first-port customs baggage reclamation and terminal transit buffers.

Connecting between flights at Mumbai’s Chhatrapati Shivaji Maharaj International Airport (CSMIA / BOM) requires precise timing and clear understanding of airport geography. Unlike modern hubs with adjacent passenger concourses, Mumbai’s airport campus is bifurcated by two cross-cutting runways (Runway 09/27 and Runway 14/32).

Terminal 1 (Santacruz) handles domestic budget flights on the western flank of the airfield, while the flagship Terminal 2 (Sahar) manages all international flights and full-service domestic operations on the northeastern flank. Connecting between them requires exiting the terminal landside and navigating either road-based airport shuttle buses, pre-paid taxis, or the underground Mumbai Metro Line 3.

Understanding terminal assignments, transport options, minimum connection times, and customs re-check regulations ensures seamless transit without missed flight departures.

CSMIA Terminal Architecture and Airline Allocations

To prevent arriving at the wrong terminal forecourt, passengers must verify their airline and terminal assignments before landing or departing.

                    MUMBAI CSMIA AIRPORT TERMINAL COMPLEX

+-----------------------+                    +----------------------------+
|      TERMINAL 1       |                    |        TERMINAL 2          |
|   (Santacruz Domestic)|                    |   (Sahar Integrated Hub)   |
|   - IndiGo (select)   |                    |   - All International      |
|   - SpiceJet          |                    |   - Air India (All)        |
|                       |                    |   - Akasa Air              |
|                       |                    |   - IndiGo (select)        |
+-----------+-----------+                    +--------------+-------------+
            |                                               |
            | <========== 5.2 km Road / Metro Line 3 ======>|
            |     - CSMIA Free Shuttle Bus (Every 20-30 min)|
            |     - Metro Line 3 Aqua Line (4-5 min ride)   |
            |     - App Cabs / Pre-paid Taxi (15-30 min)    |
            +-----------------------------------------------+

Terminal 1 (Santacruz Domestic)

Terminal 1, situated off the Western Express Highway in Santacruz (East), is dedicated entirely to domestic operations. It primarily serves:

• IndiGo: Selected high-density domestic departures and arrivals (passengers must inspect their boarding pass or itinerary for "T1").
• SpiceJet: Domestic passenger operations.

T1 features separate entry departure gates and an integrated ground-level arrivals concourse. It does not have an international wing or customs clearance infrastructure.

Terminal 2 (Sahar Integrated Terminal)

Terminal 2, located in Sahar, Andheri (East), is CSMIA’s primary architectural centerpiece. It operates on four tiered levels:

• Level 4: Departures check-in hall, security screening, and immigration control.
• Level 3: Domestic security screening and retail concourse.
• Level 2: International and domestic arrivals, immigration counters, baggage claim carousels, customs inspection, and the inter-terminal transfer desk.
• Level 1 / Ground: Ground transport center, multi-level car parking (MLCP), bus staging bays, and pre-paid cab pick-up zones.

Terminal 2 accommodates:

• 100% of International Flights: Every foreign carrier (such as Emirates, Singapore Airlines, Qatar Airways, British Airways, Lufthansa, Etihad, United Airlines, and Virgin Atlantic) and all international flights operated by Indian carriers (Air India and IndiGo).
• Air India: All domestic and international operations.
• Akasa Air: Domestic operations.
• IndiGo: Select domestic flights connecting to international banks or specific 6E flight numbering series.

Inter-Terminal Transit Options: Shuttle, Metro Line 3, and Cabs

Because Mumbai CSMIA does not operate an airside monorail or sterile passenger tunnel between Santacruz and Sahar, all inter-terminal transfers take place landside.

1. Complimentary CSMIA Inter-Terminal Shuttle Bus

Mumbai International Airport Limited (MIAL) provides a round-the-clock complimentary shuttle coach service linking T1 and T2.

• Eligibility: Free for all travelers presenting a confirmed onward boarding pass or valid flight e-ticket departing from the opposite terminal within 24 hours.
• Frequency: Shuttles depart every 20 to 30 minutes, 24 hours a day.
• Transit Duration: 15 to 25 minutes depending on traffic along the Western Express Highway, Nehru Road, and Sahar Elevated Road.
• Where to Catch at Terminal 1: Exit the T1 arrivals baggage hall and proceed toward the designated shuttle bus staging bay located on the arrivals forecourt outside Gate A. Visit the CSMIA Inter-Terminal Transfer Counter inside the arrivals area to collect your boarding coupon.
• Where to Catch at Terminal 2: At T2 Level 2 Arrivals, visit the Inter-Terminal Transfer Counter located in the central arrivals greeting corridor past customs. Proceed down to the ground transport lane (P4 pick-up zone) where low-floor airport buses stage.
• Luggage Storage: Buses feature lower-deck luggage bays and interior floor racks managed by ground staff.

2. Mumbai Metro Line 3 (Aqua Line)

The opening of Mumbai Metro Line 3 (Aqua Line) provides the fastest, fully traffic-isolated link between Terminal 1 and Terminal 2.

• Stations: Direct underground stations serve both facilities—CSMIA T1 Metro Station and CSMIA T2 Metro Station.
• Transit Duration: Approximately 4 to 5 minutes between stations.
• Operating Schedule: Trains operate from early morning (06:30) until late evening (22:30), with headways of 6 to 10 minutes during standard operating windows.
• Fare: ₹10 for a single token, National Common Mobility Card (NCMC) tap, or mobile QR ticket.
• Luggage Handling: Station concourses feature standard X-ray security scanning units. Standard wheeled luggage and cabin bags are permitted on trains. For travelers carrying multiple oversized suitcases, the dedicated airport shuttle bus remains preferable to navigating metro turnstiles and escalators.

3. Pre-paid Taxis and App-Based Cabs (Uber and Ola)

When connection windows are compressed and an airport shuttle departure is not immediately available, private on-demand vehicles provide point-to-point transit:

• Pick-up Zones: At Terminal 1, app cabs pick up from dedicated bays outside arrivals. At Terminal 2, app cabs operate from designated parking decks in the Multi-Level Car Parking (P4 and P7).
• Travel Time: 15 to 30 minutes. During evening rush hours (17:30 to 20:30), surface road traffic along the Western Express Highway can lengthen transfer times.
• Estimated Fares: ₹180 to ₹350 for app-based sedans or pre-paid black-and-yellow (Kaali-Peeli) metered taxis.

Mumbai Airport Terminal Transfer Logistics & Connection Metrics

Minimum Connection Times (MCT) and Operational Rules

Missing a connecting flight due to terminal transfers can result in ticket cancellations and rebooking penalties. Understanding official and realistic operational thresholds prevents disruptions.

Cross-Terminal Domestic to International (T1 to T2)

When arriving on a domestic low-cost carrier at Terminal 1 (such as IndiGo or SpiceJet) and connecting to an international flight departing from Terminal 2 (such as Emirates, Qatar Airways, Air India, or British Airways):

• Minimum Connection Window: Maintain at least 180 minutes (3 hours) between scheduled touchdown and your onward departure.
• Operational Timeline: Aircraft taxiing and deplaning require 15 to 25 minutes. Luggage delivery at T1 carousels takes 20 to 30 minutes. Securing the shuttle coupon and driving to T2 adds 25 to 35 minutes. International check-in desks at T2 close strictly 60 minutes prior to scheduled departure. A connection window below 3 hours leaves zero buffer for tarmac holds or baggage delays.

International to Domestic Connections (The CBIC Customs Rule)

India enforces strict first-port-of-entry customs procedures under the Central Board of Indirect Taxes and Customs (CBIC):

1. Immigration Clearance: Every traveler landing at Mumbai CSMIA on a flight originating outside India must complete immigration formalities at Terminal 2.
2. Mandatory Baggage Reclamation: Regardless of whether your baggage tag displays an ultimate domestic destination (such as Delhi, Bengaluru, Goa, or Hyderabad), you must collect all checked bags from the arrival carousels at T2.
3. Customs Clearance: You must carry your luggage through the Customs Green Channel (for allowances within statutory duty-free limits) or Red Channel (if carrying dutiable goods, commercial merchandise, excess gold, or declarable foreign currency).
4. Transfer to Departure Terminal:
   • If your onward domestic flight departs from Terminal 2 (e.g., Air India or Akasa Air), take your luggage to the domestic re-check counters located on Level 2 immediately outside customs.
   • If your onward flight departs from Terminal 1 (e.g., IndiGo or SpiceJet), exit the terminal landside, take the free shuttle or taxi across to Santacruz, and check your bags at the T1 departures hall.
5. Recommended Buffer: Maintain 210 to 240 minutes (3.5 to 4 hours) for international-to-domestic transfers involving a T2-to-T1 switch.

Traveler Logistics Guide

Follow this step-by-step checklist to complete your terminal transfer at Mumbai CSMIA efficiently.

Step 1: Locate the Inter-Terminal Transfer Desk

• Arriving at Terminal 1: Once you retrieve your checked luggage from the belt, do not immediately exit through the exterior doors. Look for the CSMIA Inter-Terminal Transfer Counter located near the arrivals exit. Present your arriving boarding stub and your onward flight reservation. The customer service executive will issue a paper voucher authorizing complimentary shuttle boarding.
• Arriving at Terminal 2: After passing through customs clearance, enter the central arrivals greeting concourse on Level 2. Follow directional signage to the transfer information kiosk. Staff will validate your onward ticket and direct you down to the P4 shuttle bay.

Step 2: Selecting Between the Free Shuttle Bus and Metro Line 3

Evaluate your luggage volume and transfer urgency:

• Choose the Free Shuttle Bus if: You have two or more heavy checked suitcases, child strollers, or oversized sporting gear. Ground staff assist with loading heavy bags into the coach belly, and the shuttle drops you directly at the departure forecourt of the opposite terminal.
• Choose Metro Line 3 if: You are traveling with cabin baggage or single rolling suitcases, and road traffic is heavy along the Western Express Highway. Walk to the connected underground station concourse, purchase a ₹10 token or scan your NCMC card, and take the 5-minute train ride.

Step 3: Monitor Check-in Closure Deadlines

Airlines at Mumbai Airport enforce rigid check-in and gate closure windows:

• Domestic Departures: Check-in and checked bag drop desks close 60 minutes prior to departure. Boarding gates close 25 minutes before departure.
• International Departures: Check-in counters close 60 to 75 minutes prior to departure. Boarding gates close 20 minutes before departure.
• If your inbound flight is delayed and you have under 60 minutes before your onward flight's counter cut-off, alert airline ground staff immediately upon landing. If transferring cross-terminal with under 75 minutes remaining, bypass the scheduled shuttle bus and hire a dedicated app cab or pre-paid taxi to minimize transit waiting time.

Step 4: Layover Rest Facilities and Luggage Storage

For extended layovers between connections:

• Transit Hotel Facilities: Terminal 2 features the Niranta Transit Hotel, situated directly inside the terminal building with accessible wings for both landside and airside travelers.
• Departures Lounges: Terminal 2 hosts the Adani Lounge and Oasis Lounge, offering shower suites, dining, and charging stations. Terminal 1 features domestic departures lounges accessible via credit card programs and priority memberships.
• Left Luggage Services: If you have an 8-to-12 hour connection and plan to explore south or central Mumbai, 24/7 Left Luggage facilities operate at both Terminal 1 (near the arrivals exit) and Terminal 2 (Level 1, near the ground transportation center). A valid government-issued ID and onward ticket are mandatory for storage.

Frequently Asked Questions

Can I walk between Terminal 1 and Terminal 2 at Mumbai Airport?

No. There is no pedestrian walkway between Terminal 1 and Terminal 2. The terminals are separated by active intersecting runways and approximately 5 kilometers of suburban road network. Walking between them is physically impossible due to airport perimeter security and highway infrastructure. Passengers must take the complimentary airport shuttle bus, the underground Metro Line 3, or a taxi.

Is the CSMIA inter-terminal shuttle free for all travelers?

The shuttle bus is completely free for travelers holding a confirmed onward connecting ticket or boarding pass departing within 24 hours from the opposite terminal. Passengers must present their inbound boarding stub and onward itinerary at the Inter-Terminal Transfer Counter inside the arrivals area to receive a complimentary boarding voucher. Passengers without valid connecting flight documentation may be required to pay a nominal municipal transit fee.

How does Mumbai Metro Line 3 compare to the shuttle bus for transferring between T1 and T2?

Mumbai Metro Line 3 (Aqua Line) connects CSMIA T1 and CSMIA T2 stations underground in approximately 4 to 5 minutes, completely bypassing surface traffic congestion on the Western Express Highway. It costs ₹10 per passenger. However, travelers must pass their bags through metro security X-ray scanners and navigate station turnstiles. The free airport shuttle takes 15 to 25 minutes by road but offers dedicated luggage storage bays and drops passengers directly at the terminal departures forecourt.

If I arrive on an international flight at T2 and connect to a domestic flight at T1, do I collect my luggage at T2?

Yes. Under Indian customs regulations, all international arrivals must clear customs at their initial port of entry. You must collect your checked bags at the Terminal 2 arrivals baggage reclaim hall, carry them through the Customs Green or Red Channel, exit landside, transport your luggage to Terminal 1 via shuttle bus or taxi, and check your bags in afresh at your domestic airline's check-in counter.