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Very long one-stop passenger flights involving the United States have received limited attention, despite their significance in global air travel. According to data from OAG, between August 2025 and February 2026, the ten longest one-stop routes touching the US have maximum block times ranging from 19 hours and 40 minutes to over 24 hours.
The longest of these is Singapore Airlines flight SQ26 from Singapore to New York JFK via Frankfurt, which has a maximum scheduled time of up to 24 hours and 20 minutes. This service uses a Boeing 777-300ER and operates daily with fifth freedom rights. It replaces a previous record-holder: Singapore Airlines’ former route from Singapore to Houston Intercontinental via Manchester, which operated until March 2025 with a block time of up to 26 hours and 15 minutes.
Other notable entries include Qantas’s QF4 from New York JFK back to Sydney via Auckland (23 hours), and United Airlines’ new Los Angeles-Bangkok service (UA820) via Hong Kong at just over 22 hours. United will begin operating this route daily on a Boeing 787-9 starting in October. Another recent addition is United’s seasonal Houston-Ulaanbaatar flight (UA7) via Tokyo Narita, launched in May 2025.
