It depends where you're flying from, but from New York to Oslo Brussels Airlines, Austrian Airlines, Lufthansa, United, Aeroflot, British Airways, and SWISS are some of the airlines.
2hr 10min Dublin (DUB) to Oslo (OSL) by a nonstop flight operated by SAS - Scandinavian Airlines System.
1hr 55min to 2hr 05min Brussels (BRU) to Oslo (OSL) by a nonstop flight operated by SAS - Scandinavian Airlines System or Brussels Airlines.
1hr 45min to 1hr 55min Amsterdam (AMS) to Oslo (OSL) by a nonstop flight operated by Norwegian Air Shuttle, SAS Scandinavian Airlines System or KLM Royal Dutch Airlines.
2hr 20min Oslo (OSL) to Paris (CDG) by a nonstop flight operated by SAS - Scandinavian Airlines System.
There were four planes. The names:United Airlines flight 11, United Airlines flight 93, American Airlines flight 175, and American Airlines flight 77.
American Airlines Flight 11United Airlines Flight 175.American Airlines Flight 77.United Airlines Flight 93
UK airlines that offer flights to Oslo include Atlantic Airlines, British Airways, DHL Air UK, Logan Air, Monarch Airlines, Virgin Atlantic Airways and Thomson Airways.
American airlines flight 11united airlines flight 175American airlines flight 77united airlines flight 93
American Airlines Flight 11 N334AAUnited Airlines Flight 175 N612UAAmerican Airlines Flight 77 N644AAUnited Airlines Flight 93 N591UA
Ryan Air is an affordable airline that offers regular flights to Oslo Torp. There is also a website called Sky Scanner that compares ticket prices from hundreds of airlines for the best deal.
I would catch a flight, as trains don't run from the US to Oslo...
The flight time from Oslo, Norway to London Heathrow Airport is about 1 hour, 27 minutes.