それは重篤な疾病か事故等で中止せざるを得ない場合

Cancellation Insurance
With regard to the insurance cover, the following are understood to mean:
Serious illness: a deterioration of health verified by a medical professional, that obliges bed rest and involves the cessation of all activities be they professional or private.
Serious accident: Serious accident: any injury to the body derived from a cause which is violent, sudden, external and unintentioned by the victim, the consequences of which impede a normal relocation from the usual place of residence thereof.
なので、今回の騒動とは無関係。唯一の例外は、COVID-19の患者となり、しかも重篤な状態に陥った場合。九割の人は無症状か軽症なので、今感染中でも、8月初頭には回復してピンピンしています。この保険のことは忘れましょう。多分、無駄な買い物だった。

参照すべきは、通常の新型コロナウイルスによる運行への影響。エアラインによっては、国の出入国管理や経由地での制限も考慮してくれますが、欧州内のLCCなので、そこまで考慮はしていないようです。当該便が飛ぶか運休かに依るのですが・・・・。それはご自分で調べてください。

MANAGEMENT OF BOOKINGS DURING COVID-19
で予定のフライトがキャンセルか通常飛行科によって違うのですが、運行中止なら、
Is your flight operating as normal?

If your flight has been cancelled, we will let you know by email or SMS. You can also see the status of your flight by clicking here.
Check regularly the email address you provided during the booking process to see whether you receive any communications from Vueling.
Option A Change your flight
You can change to another flight on the same route free of charge (subject to availability). Route changes are not permitted.
Option B
MY FLIGHT HAS BEEN CANCELLED Request a refund

飛ぶのなら、
Yes, I booked before 10 March 2020 to fly after 1 June 2020でしょうから、
If you want to change your flight, you must pay the change fee + fare difference (if any) If your fare is TimeFlex, free unlimited changes are included
通常のキャンセル規定が適応されるでしょう。最低料金なら不可。