About this trip
This is a proper multi-country itinerary rather than a simple return fare.
Starting in Bilbao and finishing in Madrid, the trip takes you through Doha, Muscat, Singapore and Vietnam, with enough time in Vietnam to travel overland from Nha Trang to Hanoi.
Total airfare for all four booked flight components is approximately €679.94.
Every booked flight includes at least 20 kg checked baggage. Some sectors include more, but 20 kg is the minimum allowance I would advertise across the complete itinerary.
The Vietnam section is intentionally open-jaw: you fly into Nha Trang and out of Hanoi, creating a natural south-to-north road-trip buffer rather than forcing another domestic flight.
Trip structure
→ Istanbul SAW 
→ Doha 
Pegasus Airlines
Total journey: 9h20
Connection in SAW: 1h20
Checked baggage: 20 kg
→ Muscat 
Oman Air WY668
Flight time: 1h30
Direct
Checked baggage included
→ Singapore 
Oman Air WY891
Flight time: 7h25
Direct
Checked baggage included
→ Nha Trang 
Vietnam Airlines
Total journey: 8h05
One stop
Checked baggage included
This section is intentionally left overland. It gives roughly 13 days to travel north through Vietnam instead of adding another domestic flight.
→ Shanghai PVG 
→ Madrid China Eastern
Total journey: 19h15
Connection in Shanghai: 2h
Checked baggage: 2 × 23 kg
The Hanoi → Madrid flight was also available on 2, 3, 4 and 6 December at the same price when checked.
Route map
A west-to-east itinerary with a south-to-north Vietnam road-trip section before returning to Madrid.
Fare details + catches
These flights are booked separately and are not one protected through-ticket. The generous stopovers are what make this sensible. Recheck each sector before booking and avoid treating one airline as responsible for another ticket.
Booking links
This is an unusually strong multi-city trip: four countries, long-haul sectors, proper checked baggage, smart geographic progression and a built-in Vietnam road trip for under €700 in total airfare.
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A few useful extras that can make the journey easier, particularly when travelling with restrictive cabin-bag fares, arriving late or needing mobile data as soon as you land.
A useful packing solution when you are trying to fit more clothing
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