Not too scientific, but here's a website:
v-flyer
Airline Route shows some information but not a complete list, eg in schedule amendments:
- VS026 JFK0830 – 1940LHR 333 D
- VS004 JFK1830 – 0650+1LHR 346 D
- VS046 JFK1930 – 0800+1LHR 744 D
- VS010 JFK2130 – 0925+1LHR 744 D
- VS003 LHR0905 – 1150JFK 346 D
- VS045 LHR1400 – 1640JFK 744 D
- VS009 LHR1615 – 1905JFK 744 D
- VS025 LHR2005 – 2300JFK 333 D