What is the longest distance between two world capitals ?
The longest flight i can find is between Wellington(WLG) and Reykjavik(KEF)
Total distance: 13,834 mi (22,264 km)
Total duration: 30hr 30mn (66hr 45mn with connections)

Traveling to Reykjavik
Wed 29-Feb-12

Wellington (WLG)
Depart 6:05 am
to Sydney (SYD)
Arrive 7:45 am
Terminal 1 (INTERNATIONAL )
1,383 mi
(2,226 km)
Duration: 3hr 40mn

Flight: 118
Operated by: /JETCONNECT FOR QANTAS
Economy/Coach Class , BOEING 737-800 (WINGLETS) PASSENGER

Sydney (SYD)
Depart 6:05 pm
Terminal 1 (INTERNATIONAL )
to Bangkok (BKK)
Arrive 11:10 pm
4,662 mi
(7,503 km)
Duration: 9hr 5mn

Flight: 7311
Operated by: QANTAS AIRWAYS LTD.
Economy/Coach Class, Boeing 747-400
Thu 1-Mar-12

Bangkok (BKK)
Depart 12:45 am
to London (LHR)
Arrive 6:25 am
Terminal 3
5,958 mi
(9,588 km)
Duration: 12hr 40mn

Flight: 7311
Operated by: QANTAS AIRWAYS LTD.
Economy/Coach Class, Boeing 747-400

London (LHR)
Depart 6:55 pm
Terminal 5
to Oslo (OSL)
Arrive 10:10 pm
724 mi
(1,165 km)
Duration: 2hr 15mn

Flight: 770
Economy/Coach Class , Airbus A320
Fri 2-Mar-12

Oslo (OSL)
Depart 10:00 am
to Reykjavik (KEF)
Arrive 11:50 am
1,107 mi
(1,782 km)
Duration: 2hr 50mn

Flight: 4787