We found this cheap business class from Oslo, Norway to Bangkok, Thailand for only €1,363, round trip on Hainan Airlines. This fare is available from April to October 2025. Sample flight:

You can use Google flight search, and pull up the calendar to view the available dates:

Click here for the best deals on the accommodations in Bangkok!
On the long haul leg of the flight, you will be flying with Hainan Business Class Airbus A330. As there is no first class, Hainan’s Business Class section is located at the front of the aircraft and is basically split in half with three rows in the front cabin and three rows in the aft cabin, that are separated by an area with the galley and two lavatories.
The 36 seats are arranged in a 2-2-2 configuration, a cabin layout that is no longer up to 5-star business class standards. Each lie-flat seat in the Hainan Business Class Airbus A330-200 has 74 inches or 187 cm of pitch and is 22.5 inches wide. It thereby offers a fairly large legroom.

The ticket includes priority check-in, airport lounge access, business class meals, two pieces of checked in luggage, amenity kit, and wines, champagne and other beverages.
Even though you can probably save a few bucks by booking with some of the budget websites, we recommend booking directly with airline’s website to ensure better customer service post sales. Deals so good wouldn’t last. So, act fast!
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*As airfare can change daily, the fare we find and post here cannot be guaranteed for you when you book. It only reflects the fare at the time we posted. Also airlines can only guarantee the booking class, not the type of aircraft. It is possible aircraft/seats used on that day being different than originally posted.