| Region / Service | Phone Number | Notes |
|---|---|---|
| General Reservations (U.S. & Canada) | +1 800 955 1925 | Daily 9 AM – 8 PM ET; main booking and customer service line |
| International Calls | +1 617 350 7500 | For travelers calling from outside the U.S. |
| Travel Assistance (Existing Bookings) | +1 800 955 1925 | Support for payment, itinerary changes, or questions |
| Head Office | +1 617 350 7500 | Grand Circle Travel Headquarters, Boston, MA |
| Email Support | travelersupport@oattravel.com | For inquiries, assistance, or post-travel feedback |
Overseas Adventure Travel (O.A.T.) is a U.S.-based travel company founded in 1978, headquartered in Boston, Massachusetts. It specializes in small group adventures and solo-friendly tours designed for travelers aged 50 and above.
The company is part of the Grand Circle Corporation, which also operates Grand Circle Travel and Grand Circle Cruise Line. O.A.T. is well-known for:
Small group travel (avg. 8–16 travelers)
Local immersion with cultural experiences and homestays
Solo traveler programs (low or no single supplements)
Destinations spanning Africa, Asia, Europe, South America, Middle East, and Antarctica
Adventure cruises on small ships and riverboats
Its mission is to make international travel more affordable, accessible, and culturally enriching, especially for mature and independent travelers.