You're Most Likely to See a Rainbow on These Flights
Briefly

Flights over Niagara Falls between D.C. and Toronto pass directly above a trio of waterfalls—Horseshoe Falls, American Falls and Bridal Veil Falls—that produce near-constant mist and frequent rainbows on sunny days. Karersee, a glasslike alpine lake in the Dolomites, generates rainbows against mountain backdrops after rainfall and lies beneath several European routes including LHR–DBV, MUC–PMI and FRA–FCO. Owens Valley, framed by the Sierra Nevada and White Mountains, becomes a summer rainbow hotspot after thunderstorms and is crossed by U.S. routes such as PHX–SFO and SFO–LAS. The misty Isle of Skye yields rainbows around Mealt Falls, the Quiraing and the Old Man of Storr. Victoria Falls is listed as another international rainbow-viewing location.
The flight between D.C. and Toronto passes right over Niagara Falls, North America's most famous display of natural waterworks. If you didn't know, Niagara Falls is actually the name for a group of three distinct but adjacent waterfalls: Horseshoe Falls, American Falls, and Bridal Veil Falls. Together, these waterfalls produce near-constant mist, meaning sunny days are often replete with rainbows.
Karersee, Italy Best routes: London Heathrow (LHR) to Dubrovnik (DBV); Munich (MUC) to Palma de Mallorca (PMI); Frankfurt Airport (FRA) to Leonardo da Vinci Rome Fiumicino Airport (FCO) This small alpine lake in the Dolomites is like glass, and is known to produce rainbows against its mountain backdrop after rainfall. There are three flight routes between various European countries that pass straight over, so keep an eye out.
Best routes: Phoenix Sky Harbor International (PHX) to San Francisco International (SFO); Dallas/Forth Worth International (DFW) to Fresno Yosemite International (FAT); San Jose Mineta International (SJC) to Harry Reid International (LAS); San Francisco International (SFO) to Harry Reid International (LAS) Framed by the Sierra Nevada and White Mountains, Owens Valley is a rainbow hotspot in summer, when thunderstorms are followed by bright blue clear skies-the rainbows here often stretch across the entire valley.
Read at Conde Nast Traveler
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