Lazio, Lyon and West Ham also earned wins, while fan unrest led to the game between Marseille and Galatasaray being halted for about 10 minutes in the first half.
Spartak created far more chances than the Polish visitors but couldn't solve Legia's 41-year-old goalkeeper Artur Boruc.
Napoli and Leicester were drawn into the same group on Friday, along with Spartak Moscow and Legia Warsaw, for the slimmed-down tournament that now has 32 teams instead of 48.
Dublin will host the 2024 final and Bilbao the 2025 climax. The Basque region city will also stage the Women's Champions League final in 2024.
Villarreal clinched the title with a victory over Manchester United in a penalty shootout on Wednesday in Poland.
Solskjaer also seemed reluctant to trust his injury-depleted bench of substitutes, even when Villarreal brought on fresher players and started to take the initiative in extra time.
Rashford added he was “outraged” that he was sent “a mountain of monkey emojis” in a message from a person using a profile which identified them as a teacher.
The Manchester United goalkeeper's decisive penalty shot lacked power and was stopped by the Villarreal keeper Geronimo Rulli, who dived to his left to block the shot with comfort.
The shootout — after a 1-1 draw following extra time — went on so long that De Gea and Villarreal goalkeeper Gerónimo Rulli were the 11th men up, with the United GK missing the decisive penalty.
Manchester United plays Villarreal on Wednesday night in the Polish port city.
Europa League Final Live Streaming Villarreal vs Man Utd: Find full details on when and where to watch MUN vs VIL Live Online on SonyLIV and TV Telecast on Sony TEN.
Soundly defeating the likes of Arsenal and Salzburg on their collision course with Manchester United, Unai Emery and side are yet to lose a match in the competition and have drawn just twice.
It has been a precarious road to the road to silverware for Manchester United, who had to suffer a early group stage exit at the Champions League in order to be on collision course with Villarreal for the Europa League final.
Cavani scored twice in each game while De Gea produced some fine saves as United advanced 8-5 on aggregate.
Emery's Villarreal held Arsenal to a 0-0 draw in the second leg of their semifinal on Thursday, which was enough to secure a 2-1 aggregate win.
An inspired goalkeeping performance by David de Gea ensured United was only beaten 3-2 by Roma in a wild second leg of the Europa League semifinals.
Villarreal are making their fifth attempt to reach a European final, having failed on all previous occasions.
Cavani scored two of United’s five second-half goals, with Fernandes adding a penalty to his brilliantly taken first-half opener before Paul Pogba and substitute Mason Greenwood also netted.
In September, he was so close to joining Juventus that he momentarily stopped playing for Roma. In January, there was a supposed swap deal set up with Inter Milan for Alexis Sánchez.
While United will meet Roma in the semifinal, Arsenal will face Villarreal, currently managed by the London club's former boss Unai Emery.
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