Route guide

Athens to Sofia (ATH-SOF): Nonstop Upgrade & Award Space

Aegean Airlines, Big Sky Airlines, Bulgaria Air, and Hahn Air Systems fly nonstop between Athens (ATH) and Sofia (SOF), roughly 23 times a week. Because so many carriers compete on this route, premium seats turn over daily, and upgrade or award space can open and close within hours. 2LNR tracks confirmed availability on every ATH to SOF departure, so you know which flights have space before you book.

Data current as of July 21, 2026, refreshed on an ongoing basis as new schedules and seats are confirmed.

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23
Nonstop flights a week
330 mi
Nonstop distance
Free
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Confirmed upgrade & award space on every ATH to SOF departure

2LNR tracks confirmed upgrade and award availability on American, Delta, and Alaska and across 30 airlines, segment by segment, date by date. Open the calendar for Athens to Sofia to see which departures have real space, or watch the route and get alerted when space opens.

See real availability

Confirmed upgrade and award seats on each ATH to SOF departure, checked against live inventory so you know what is open before you book.

Set an alert

Premium inventory turns over fast. Watch this route and 2LNR notifies you when space appears on a date you are tracking.

Plan on the map

See ATH to SOF on the interactive route map, with schedules, connections, and route statistics.

Airlines flying Athens to Sofia nonstop

Carriers operating ATH to SOF nonstop in the current schedule. 2LNR tracks confirmed upgrade and award space on each of them.

  • Aegean Airlines
  • Big Sky Airlines
  • Bulgaria Air
  • Hahn Air Systems
See ATH to SOF on the interactive map →

Frequently asked questions about ATH to SOF

How far is Sofia from Athens?
ATH to SOF covers about 330 miles nonstop. Flight times vary by aircraft and season; each scheduled departure on this page lists its own times.
Which airlines fly nonstop from ATH to SOF?
Aegean Airlines, Big Sky Airlines, Bulgaria Air, and Hahn Air Systems fly the route nonstop. 2LNR tracks confirmed upgrade and award space on all four of them.
How many flights a week are there from ATH to SOF?
About 23 nonstop flights a week run between Athens and Sofia in the current schedule, operated by Aegean Airlines, Big Sky Airlines, Bulgaria Air, and Hahn Air Systems. Frequency shifts by season; the calendar on this page reflects what's currently scheduled.
How do I check upgrade or award availability on ATH to SOF?
Open the ATH to SOF calendar on this page to see confirmed upgrade and award space by date. You can also set an alert on the Athens to Sofia route, and 2LNR will notify you when space opens. It's free to start.

Never miss ATH to SOF upgrade or award space

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