$400 - Flight tickets from Boston(BOS) to Kolkata(CCU)
Airline
04:25 PM on Apr 29, 2026 BOS
1 Stop {AUH} | Trip Duration: 25 hr 05 min
03:00 AM on May 01, 2026 CCU
Etihad Airways 8 / 220

Book flights from BOS to CCU at 04:25 PM with Etihad Airways on Apr 29, 2026

$400
Airline
04:25 PM on Apr 29, 2026 BOS
1 Stop {AUH} | Trip Duration: 25 hr 05 min
03:00 AM on May 01, 2026 CCU
Etihad Airways 8 / 220

Book flights from BOS to CCU at 04:25 PM with Etihad Airways on Apr 29, 2026

$533.50
Airline
04:25 PM on Apr 29, 2026 BOS
1 Stop {AUH} | Trip Duration: 25 hr 05 min
03:00 AM on May 01, 2026 CCU
Etihad Airways 8 / 220

Book flights from BOS to CCU at 04:25 PM with Etihad Airways on Apr 29, 2026

$537.12
Airline
04:25 PM on Apr 29, 2026 BOS
1 Stop {AUH} | Trip Duration: 22 hr 20 min
12:15 AM on May 01, 2026 CCU
Flight 1696 operated by Air Arabia Abu Dhabi Etihad Airways 8 / 1696

Book flights from BOS to CCU at 04:25 PM with Etihad Airways on Apr 29, 2026

$593.50
Airline
10:00 PM on Apr 29, 2026 BOS
1 Stop {DOH} | Trip Duration: 19 hr 00 min
02:30 AM on May 01, 2026 CCU
Qatar Airways 744 / 540

Book flights from BOS to CCU at 10:00 PM with Qatar Airways on Apr 29, 2026

$614.50
Airline
03:17 PM on Apr 29, 2026 BOS
2 Stops {JFK | DOH} | Trip Duration: 25 hr 43 min
02:30 AM on May 01, 2026 CCU
Flight 2879 operated by YX/REPUBLIC AIRWAYS AS AMERICAN EAGLE Qatar Airways 2879 / 702 / 540

Book flights from BOS to CCU at 03:17 PM with Qatar Airways on Apr 29, 2026

$619.50
Airline
03:59 PM on Apr 29, 2026 BOS
2 Stops {ORD | DOH} | Trip Duration: 25 hr 01 min
02:30 AM on May 01, 2026 CCU
Flight 2519 operated by American Airlines Qatar Airways 2519 / 726 / 540

Book flights from BOS to CCU at 03:59 PM with Qatar Airways on Apr 29, 2026

$622.81
Hurry! Only 3 seats left at this fare
Airline
05:00 PM on Apr 29, 2026 BOS
2 Stops {JFK | DOH} | Trip Duration: 24 hr 00 min
02:30 AM on May 01, 2026 CCU
Flight 3843 operated by JetBlue Airways Qatar Airways 3843 / 702 / 540

Book flights from BOS to CCU at 05:00 PM with Qatar Airways on Apr 29, 2026

$655.64
Airline
09:50 PM on Apr 29, 2026 BOS
2 Stops {IST | DEL} | Trip Duration: 27 hr 25 min
10:45 AM on May 01, 2026 CCU
Flight 7752 operated by IndiGo | Flight 7801 operated by IndiGo Turkish Airlines 82 / 7752 / 7801

Book flights from BOS to CCU at 09:50 PM with Turkish Airlines on Apr 29, 2026

$659.32
Hurry! Only 0 seats left at this fare
Airline
09:50 PM on Apr 29, 2026 BOS
2 Stops {IST | BOM} | Trip Duration: 29 hr 35 min
12:55 PM on May 01, 2026 CCU
Flight 7840 operated by IndiGo Turkish Airlines 82 / 720 / 7840

Book flights from BOS to CCU at 09:50 PM with Turkish Airlines on Apr 29, 2026

$669.02
Hurry! Only 4 seats left at this fare
Airline Airline
09:50 PM on Apr 29, 2026 BOS
2 Stops {IST | DEL} | Trip Duration: 25 hr 20 min
08:40 AM on May 01, 2026 CCU
Turkish Airlines 82 / 716 | Air India 2535

Book flights from BOS to CCU at 09:50 PM with Turkish Airlines on Apr 29, 2026

$671.20
Airline Airline
09:50 PM on Apr 29, 2026 BOS
2 Stops {IST | DEL} | Trip Duration: 25 hr 20 min
08:40 AM on May 01, 2026 CCU
Turkish Airlines 82 / 716 | Air India 2535

Book flights from BOS to CCU at 09:50 PM with Turkish Airlines on Apr 29, 2026

$674.00
Hurry! Only 0 seats left at this fare
Airline Airline
06:00 AM on Apr 29, 2026 BOS
2 Stops {EWR | BOM} | Trip Duration: 28 hr 25 min
07:55 PM on Apr 30, 2026 CCU
United Airlines 1833 | Air India 144 / 2481

Book flights from BOS to CCU at 06:00 AM with Air India on Apr 29, 2026

$678.50
Airline Airline
06:00 AM on Apr 29, 2026 BOS
2 Stops {ORD | DEL} | Trip Duration: 28 hr 45 min
08:15 PM on Apr 30, 2026 CCU
United Airlines 1414 | Air India 126 / 2403

Book flights from BOS to CCU at 06:00 AM with Air India on Apr 29, 2026

$693.50
Airline Airline
06:00 AM on Apr 29, 2026 BOS
2 Stops {EWR | BOM} | Trip Duration: 28 hr 25 min
07:55 PM on Apr 30, 2026 CCU
United Airlines 1833 | Air India 144 / 2481

Book flights from BOS to CCU at 06:00 AM with Air India on Apr 29, 2026

$699.50
Airline Airline
06:00 AM on Apr 29, 2026 BOS
2 Stops {ORD | DEL} | Trip Duration: 28 hr 45 min
08:15 PM on Apr 30, 2026 CCU
United Airlines 1414 | Air India 126 / 2403

Book flights from BOS to CCU at 06:00 AM with Air India on Apr 29, 2026

$705.63
Airline
05:00 PM on Apr 29, 2026 BOS
3 Stops {JFK | FRA | SIN} | Trip Duration: 51 hr 30 min
10:15 PM on May 01, 2026 CCU
Flight 1453 operated by JetBlue Airways Singapore Airlines 1453 / 25 / 516

Book flights from BOS to CCU at 05:00 PM with Singapore Airlines on Apr 29, 2026

$707.39
Hurry! Only 0 seats left at this fare
Airline
09:10 PM on Apr 29, 2026 BOS
2 Stops {SFO | SIN} | Trip Duration: 39 hr 35 min
10:15 PM on May 01, 2026 CCU
Flight 1539 operated by JetBlue Airways Singapore Airlines 1539 / 31 / 516

Book flights from BOS to CCU at 09:10 PM with Singapore Airlines on Apr 29, 2026

$719.90
Hurry! Only 0 seats left at this fare
Airline
05:00 PM on Apr 29, 2026 BOS
3 Stops {JFK | FRA | SIN} | Trip Duration: 51 hr 30 min
10:15 PM on May 01, 2026 CCU
Flight 1453 operated by JetBlue Airways Singapore Airlines 1453 / 25 / 516

Book flights from BOS to CCU at 05:00 PM with Singapore Airlines on Apr 29, 2026

$796.00
Hurry! Only 0 seats left at this fare
Airline
05:00 PM on Apr 29, 2026 BOS
3 Stops {JFK | FRA | SIN} | Trip Duration: 43 hr 45 min
10:15 PM on May 01, 2026 CCU
Flight 1453 operated by JetBlue Airways Singapore Airlines 1453 / 25 / 516

Book flights from BOS to CCU at 05:00 PM with Singapore Airlines on Apr 29, 2026

$836.00
Hurry! Only 4 seats left at this fare
Airline
09:40 PM on Apr 29, 2026 BOS
2 Stops {ZRH | DEL} | Trip Duration: 21 hr 05 min
04:15 AM on May 01, 2026 CCU
Flight 9858 operated by Air India SWISS 53 / 146 / 9858

Book flights from BOS to CCU at 09:40 PM with SWISS on Apr 29, 2026

$847.20
Hurry! Only 4 seats left at this fare
Airline
05:20 PM on Apr 29, 2026 BOS
2 Stops {ZRH | DEL} | Trip Duration: 25 hr 25 min
04:15 AM on May 01, 2026 CCU
Flight 9858 operated by Air India SWISS 55 / 146 / 9858

Book flights from BOS to CCU at 05:20 PM with SWISS on Apr 29, 2026

$851.90
Hurry! Only 4 seats left at this fare
Airline
05:20 PM on Apr 29, 2026 BOS
2 Stops {ZRH | DEL} | Trip Duration: 25 hr 25 min
04:15 AM on May 01, 2026 CCU
Flight 9858 operated by Air India SWISS 55 / 146 / 9858

Book flights from BOS to CCU at 05:20 PM with SWISS on Apr 29, 2026

$852.20
Hurry! Only 4 seats left at this fare
Airline Airline
09:40 PM on Apr 29, 2026 BOS
2 Stops {ZRH | DEL} | Trip Duration: 21 hr 05 min
04:15 AM on May 01, 2026 CCU
SWISS 53 / 146 | Air India 2702

Book flights from BOS to CCU at 09:40 PM with SWISS on Apr 29, 2026

$856.90
Airline
08:05 PM on Apr 29, 2026 BOS
2 Stops {MUC | DEL} | Trip Duration: 27 hr 05 min
08:40 AM on May 01, 2026 CCU
Flight 5286 operated by Air India Lufthansa 425 / 762 / 5286

Book flights from BOS to CCU at 08:05 PM with Lufthansa on Apr 29, 2026

$873.30
Hurry! Only 4 seats left at this fare
Airline
08:05 PM on Apr 29, 2026 BOS
2 Stops {MUC | DEL} | Trip Duration: 27 hr 05 min
08:40 AM on May 01, 2026 CCU
Flight 5286 operated by Air India Lufthansa 425 / 762 / 5286

Book flights from BOS to CCU at 08:05 PM with Lufthansa on Apr 29, 2026

$878.30
Hurry! Only 4 seats left at this fare
Airline
05:45 PM on Apr 29, 2026 BOS
2 Stops {FRA | DEL} | Trip Duration: 29 hr 25 min
08:40 AM on May 01, 2026 CCU
Flight 5286 operated by Air India Lufthansa 423 / 760 / 5286

Book flights from BOS to CCU at 05:45 PM with Lufthansa on Apr 29, 2026

$951.80
Hurry! Only 4 seats left at this fare
Airline
05:45 PM on Apr 29, 2026 BOS
2 Stops {FRA | DEL} | Trip Duration: 29 hr 25 min
08:40 AM on May 01, 2026 CCU
Flight 5286 operated by Air India Lufthansa 423 / 760 / 5286

Book flights from BOS to CCU at 05:45 PM with Lufthansa on Apr 29, 2026

$953.20
Hurry! Only 4 seats left at this fare
Airline Airline
01:00 PM on Apr 29, 2026 BOS
2 Stops {YYZ | DEL} | Trip Duration: 29 hr 45 min
04:15 AM on May 01, 2026 CCU
Air Canada 8693 / 42 | Air India 2702

Book flights from BOS to CCU at 01:00 PM with Air Canada on Apr 29, 2026

$999.00
Airline Airline
06:25 PM on Apr 29, 2026 BOS
2 Stops {EWR | DEL} | Trip Duration: 24 hr 20 min
04:15 AM on May 01, 2026 CCU
United Airlines 1693 / 82 | Air India 2702

Book flights from BOS to CCU at 06:25 PM with United Airlines on Apr 29, 2026

$1006.50
Airline
11:05 PM on Apr 29, 2026 BOS
1 Stop {DXB} | Trip Duration: 23 hr 35 min
08:10 AM on May 01, 2026 CCU
Emirates 238 / 570

Book flights from BOS to CCU at 11:05 PM with Emirates on Apr 29, 2026

$1016.50
Hurry! Only 0 seats left at this fare
Airline
11:05 PM on Apr 29, 2026 BOS
1 Stop {DXB} | Trip Duration: 23 hr 35 min
08:10 AM on May 01, 2026 CCU
Emirates 238 / 570

Book flights from BOS to CCU at 11:05 PM with Emirates on Apr 29, 2026

$1029.50
Airline
11:05 PM on Apr 29, 2026 BOS
1 Stop {DXB} | Trip Duration: 23 hr 35 min
08:10 AM on May 01, 2026 CCU
Emirates 238 / 570

Book flights from BOS to CCU at 11:05 PM with Emirates on Apr 29, 2026

$1091.00
Airline
04:23 PM on Apr 29, 2026 BOS
2 Stops {ORD | DXB} | Trip Duration: 30 hr 17 min
08:10 AM on May 01, 2026 CCU
Flight 6022 operated by United Airlines Emirates 6022 / 236 / 570

Book flights from BOS to CCU at 04:23 PM with Emirates on Apr 29, 2026

$1110.70
Hurry! Only 4 seats left at this fare
Airline
01:00 PM on Apr 29, 2026 BOS
2 Stops {NRT | DEL} | Trip Duration: 33 hr 00 min
07:30 AM on May 01, 2026 CCU
Flight 9044 operated by IndiGo Japan Airlines 7 / 749 / 9044

Book flights from BOS to CCU at 01:00 PM with Japan Airlines on Apr 29, 2026

$1367.70
Hurry! Only 4 seats left at this fare
Airline
01:00 PM on Apr 29, 2026 BOS
2 Stops {NRT | DEL} | Trip Duration: 36 hr 15 min
10:45 AM on May 01, 2026 CCU
Flight 9291 operated by IndiGo Japan Airlines 7 / 749 / 9291

Book flights from BOS to CCU at 01:00 PM with Japan Airlines on Apr 29, 2026

$1414.70
Hurry! Only 4 seats left at this fare
Airline
01:00 PM on Apr 29, 2026 BOS
2 Stops {NRT | BLR} | Trip Duration: 33 hr 10 min
07:40 AM on May 01, 2026 CCU
Flight 9775 operated by IndiGo Japan Airlines 7 / 753 / 9775

Book flights from BOS to CCU at 01:00 PM with Japan Airlines on Apr 29, 2026

$8578.10
Hurry! Only 4 seats left at this fare
Airline
10:00 PM on Apr 29, 2026 BOS
2 Stops {DOH | KUL} | Trip Duration: 39 hr 55 min
11:25 PM on May 01, 2026 CCU
Flight 9080 operated by Qatar Airways | Flight 9053 operated by Qatar Airways Malaysia Airlines 9080 / 9053 / 184

Book flights from BOS to CCU at 10:00 PM with Malaysia Airlines on Apr 29, 2026

$8808.50
Airline Airline
01:45 AM on Apr 29, 2026 BOS
2 Stops {HKG | DEL} | Trip Duration: 31 hr 10 min
06:25 PM on Apr 30, 2026 CCU
Cathay Pacific 811 | Air India 315 / 1733

Book flights from BOS to CCU at 01:45 AM with Cathay Pacific on Apr 29, 2026

$8960.10
Hurry! Only 4 seats left at this fare
Airline Airline
01:45 AM on Apr 29, 2026 BOS
2 Stops {HKG | SIN} | Trip Duration: 35 hr 20 min
10:35 PM on Apr 30, 2026 CCU
Cathay Pacific 811 / 635 | Singapore Airlines 516

Book flights from BOS to CCU at 01:45 AM with Cathay Pacific on Apr 29, 2026

$83116.00
Airline Airline
01:45 AM on Apr 29, 2026 BOS
2 Stops {HKG | DEL} | Trip Duration: 31 hr 10 min
06:25 PM on Apr 30, 2026 CCU
Cathay Pacific 811 | Air India 315 / 1733

Book flights from BOS to CCU at 01:45 AM with Cathay Pacific on Apr 29, 2026

$109996.00
Hurry! Only 4 seats left at this fare
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Prices observed in the past 7 days start at 400 for one-way flights and 773.91 for round trips, for the specified period. Availability and prices are subject to change, and additional terms may apply.
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This 'round trip flight' deal was found by Indian Eagle visitors 18hrs hours ago. Clicking on the 'Search Now' button will let you select your dates and customize your itinerary. The prices displayed are subject to availability and may change as per the selected travel dates.
Airline
BOS 04:25 PM Jun 02, 2026
18 hr 35 min connectingImg 1 Stop
CCU 08:30 PM Jun 03, 2026
Airline
CCU 09:30 PM Aug 30, 2026
26 hr 40 min connectingImg 1 Stop
BOS 02:40 PM Aug 31, 2026
$773.91
Found 18hrs ago
This 'round trip flight' deal was found by Indian Eagle visitors 20hrs hours ago. Clicking on the 'Search Now' button will let you select your dates and customize your itinerary. The prices displayed are subject to availability and may change as per the selected travel dates.
Airline
BOS 11:05 PM Jun 02, 2026
23 hr 35 min connectingImg 1 Stop
CCU 08:10 AM Jun 04, 2026
Airline
CCU 08:55 PM Aug 30, 2026
26 hr 45 min connectingImg 1 Stop
BOS 02:10 PM Aug 31, 2026
$945.41
Found 20hrs ago
This 'round trip flight' deal was found by Indian Eagle visitors 20hrs hours ago. Clicking on the 'Search Now' button will let you select your dates and customize your itinerary. The prices displayed are subject to availability and may change as per the selected travel dates.
Airline
BOS 10:00 PM Jun 02, 2026
19 hr 00 min connectingImg 1 Stop
CCU 02:30 AM Jun 04, 2026
Airline
CCU 04:00 AM Aug 30, 2026
20 hr 45 min connectingImg 1 Stop
BOS 03:15 PM Aug 30, 2026
$1029.19
Found 20hrs ago
This 'round trip flight' deal was found by Indian Eagle visitors 18hrs hours ago. Clicking on the 'Search Now' button will let you select your dates and customize your itinerary. The prices displayed are subject to availability and may change as per the selected travel dates.
Airline
BOS 09:50 PM Jun 02, 2026
27 hr 25 min connectingImg 2 Stops
CCU 10:45 AM Jun 04, 2026
Airline
CCU 10:30 PM Aug 30, 2026
30 hr 55 min connectingImg 2 Stops
BOS 07:55 PM Aug 31, 2026
$1056.95
Found 18hrs ago
This 'one-way flight' deal was found by Indian Eagle visitors 18hrs hours ago. Clicking on the 'Search Now' button will let you select your dates and customize your itinerary. The prices displayed are subject to availability and may change as per the selected travel dates.
Airline
BOS 04:25 PM Apr 29, 2026
25 hr 05 min connectingImg 1 Stop
CCU 03:00 AM May 01, 2026
$400
Found 18hrs ago
This 'one-way flight' deal was found by Indian Eagle visitors 20hrs hours ago. Clicking on the 'Search Now' button will let you select your dates and customize your itinerary. The prices displayed are subject to availability and may change as per the selected travel dates.
Airline
BOS 10:00 PM Apr 29, 2026
19 hr 00 min connectingImg 1 Stop
CCU 02:30 AM May 01, 2026
$537.12
Found 20hrs ago
This 'one-way flight' deal was found by Indian Eagle visitors 20hrs hours ago. Clicking on the 'Search Now' button will let you select your dates and customize your itinerary. The prices displayed are subject to availability and may change as per the selected travel dates.
Airline Airline
BOS 06:00 AM Apr 29, 2026
28 hr 25 min connectingImg 2 Stops
CCU 07:55 PM Apr 30, 2026
$614.50
Found 20hrs ago
This 'one-way flight' deal was found by Indian Eagle visitors 18hrs hours ago. Clicking on the 'Search Now' button will let you select your dates and customize your itinerary. The prices displayed are subject to availability and may change as per the selected travel dates.
Airline
BOS 09:50 PM Apr 29, 2026
27 hr 25 min connectingImg 2 Stops
CCU 10:45 AM May 01, 2026
$622.81
Found 18hrs ago
This 'multi-city flight' deal was found by Indian Eagle visitors 18hrs hours ago. Clicking on the 'Search Now' button will let you select your dates and customize your itinerary. The prices displayed are subject to availability and may change as per the selected travel dates.
Airline
BOS 10:10 PM Dec 19, 2025
12 hr 10 min connectingImg Non Stop
DXB 07:20 PM Dec 20, 2025
Airline
DXB 01:15 PM Dec 24, 2025
04 hr 05 min connectingImg Non Stop
CCU 06:50 PM Dec 24, 2025
$2581.90
Found 18hrs ago
This 'multi-city flight' deal was found by Indian Eagle visitors 20hrs hours ago. Clicking on the 'Search Now' button will let you select your dates and customize your itinerary. The prices displayed are subject to availability and may change as per the selected travel dates.
Airline
BOS 08:00 PM Dec 19, 2025
22 hr 10 min connectingImg 1 Stop
DXB 03:10 AM Dec 21, 2025
Airline
DXB 08:30 AM Dec 24, 2025
30 hr 05 min connectingImg 2 Stops
CCU 04:05 PM Dec 25, 2025
$3000.90
Found 20hrs ago
This 'multi-city flight' deal was found by Indian Eagle visitors 20hrs hours ago. Clicking on the 'Search Now' button will let you select your dates and customize your itinerary. The prices displayed are subject to availability and may change as per the selected travel dates.
Airline
BOS 12:30 AM Dec 19, 2025
36 hr 35 min connectingImg 1 Stop
DXB 10:05 PM Dec 20, 2025
Airline
DXB 06:45 PM Dec 24, 2025
04 hr 10 min connectingImg Non Stop
CCU 12:25 AM Dec 25, 2025
$6481.60
Found 20hrs ago
This 'multi-city flight' deal was found by Indian Eagle visitors 18hrs hours ago. Clicking on the 'Search Now' button will let you select your dates and customize your itinerary. The prices displayed are subject to availability and may change as per the selected travel dates.
Airline
BOS 10:35 AM Dec 19, 2025
27 hr 20 min connectingImg 2 Stops
DXB 10:55 PM Dec 20, 2025
Airline
DXB 06:45 PM Dec 24, 2025
04 hr 10 min connectingImg Non Stop
CCU 12:25 AM Dec 25, 2025
$7629.50
Found 18hrs ago
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Find the Best Cheap Flights from Boston to Kolkata

Travel to Kolkata without exceeding your budget with Indian Eagle, one of the leading online flight booking agencies. We help you get the cheapest airfare travel from the USA to your chosen destination. You can experience the ease of travel between Boston and Kolkata with Indian Eagle's uncomplicated booking process and the best customer care support. Indian Eagle makes your trip affordable by providing cheap Boston to Kolkata flights.

You can plan your trip, book cheap BOS to CCU flights with us easily. So that you can experience a memorable and budget-friendly adventure.

Top 5 Must-Do Activities in Kolkata

Here are some of the top things you can do in Kolkata with which you can have an unforgettable travel experience.

  • Visit some iconic landmarks that show the great richness of culture and history.
  • Walk around the local markets, buy unique souvenirs, try local street food, and also enjoy the local feel of Kolkata.
  • Take a nature walk or enjoy nature on scenic walks or hikes.
  • Enjoy local cuisine with authentic flavors that will give you the true flavor of Kolkata.
  • Discover art and culture through visits to the museums and galleries, thus experiencing local creativity and traditions.

How to Book a Cheap Flight from Boston to Kolkata With Indian Eagle?

Flexible dates need to be selected to get a low fare. Indian Eagle provides the advanced fare calendar. Through this, it enables multiple choices and shows the days when traveling from Boston to Kolkata is affordable. It will simply allow you to alter dates so you can save more by getting cheap flights from BOS to CCU.

Our fare alerts will keep you updated on any changes in prices. Sign up for alerts on your Boston to Kolkata route, and Indian Eagle will let you know when the prices drop. That way, you don't need to check fares every day, we'll tell you when it's time to book for the best price.

Flights with layovers can save a lot of money. Indian Eagle offers you detailed options for layovers on your journey from Boston to Kolkata. If time permits, a one-stop or two-stop flight can be very cost-effective while allowing you to visit another city on the way.

So, what are you waiting for? Start visiting and exploring the attractions of Kolkata. Markets and landmarks are surrounded by delectable food served along with local traditions. Book cheap flights from Boston to Kolkata and discover the treasures in the depths of this place.


Frequently Asked Questions:

When should I book cheap flight tickets from Boston to Kolkata?

The best time to book cheap flight tickets from Boston to Kolkata is 4-6 weeks in advance, when cheaper fares will be available before the peak travel seasons.

How early should I arrive at the airport for my Boston to Kolkata flight?

To ensure a smooth check-in process, it's recommended to arrive at least 3 hours before departure for an international flight.

Do I get a refund if I change my Boston to Kolkata flight after it's been booked?

Changes can be done with charges that are based on the flight's changing policy. You can connect with Indian Eagle's customer service for guidance.

Does Indian Eagle offer last-minute flights from Boston to Kolkata?

Yes, we do provide the cheapest last-minute Boston to Kolkata flights.

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