Early life

In the early ages she excelled in all the major national, and international races. She approached the professional level at the age of 18, in 1997. In her first year, she obtained ninth place in the 5 km freestyle, at the 1997 FIS Junior World Ski Championships in Canmore, Canada.

In 1999, she achieved a podium position at the FIS Junior World Ski Championships in Saalfelden, Austria with a 3rd place in the 5 km C, a race where athletes like Marit Bjørgen, Petra Majdič, and Aino-Kaisa Saarinen were also competing. Longa also earned great results in the Continental Cup, including the win at the 5 km classical stage in Candanchu, Spain where she preceded Majdič|.

World Cup debut

Between 2000 and 2001 she was competing in both the Continental Cup, and the World Cup. The top result was a second position in the 5 km classical in Schonach, Germany in the Continental Cup. She ended the 2001 season in 85th position in the overall World Cup standings.

Winter Olympics and World Ski Championships Debuts

In the 2002 Winter Olympics, in Salt Lake City, at the age of 22, she obtained 6th position in the 4 × 5 km relay, and a 20th position in the 10 km classical. She ended the 2002 season in 80th position in the World Cup overall standings

In the 2003 World Ski Championships, in Val di Fiemme, she finished 7th in the 4 × 5 km relay and 11th in the 15 km C Mass start. Longa ended the 2003 season in 51st position in the world cup overall standing achieving a 7th place in the 10 km classical mass start as top result.

Pregnancy and return to competitions 2004 - 2008

Between the 2004 and 2006 she did not obtain major results as a consequence of her pregnancy, announced in February 2005. In the 2007 World Ski Championship, in Sapporo, Japan, she obtained eight position in the 15 km M Pursuit, and sixth in the 4 × 5 km relay. The best individual result in 2007 is fifth place in the 10 km classical in Otepaeae, Estonia. She ended the season with an overall 19th position in the world cup standing. In March 2007, she retired, at the end of her best world cup season so far. Although the decision to retire, taken one year earlier, Longa gave her come back already in March 2008.

Longa had a brilliant start on returning to competition, with a fifth place on the 10 km classical World Cup in Lathi, Finland. The 2008 also brought a fourth place on the 10 km classical, and a fifth place on the 10 km freestyle pursuit in the World Cup Finals in Bormio. In the summer of 2008 she also competed in roller skiing races to speed-up her recovery, obtaining a victory, two seconds and a fourth place.

From 2009

On 30 January 2009 she won her first world cup race in Rybinsk, Russia on the 10 km F Mass start. A month after, she won two medals at the 2009 FIS Nordic World Ski Championship in Liberec with a silver in the 10 km C and bronze in the team sprint C event. She finished the 2009 season in sixth position in the overall World Cup Standings.

In the 2010 Winter Olympics in Vancouver, she earned fourth place in the relay 4 × 5 km relay, seventh place in the 15 km pursuit, and eleventh in the 30 km classical. She ended the 2010 World Cup season in ninth position in the overall standings, with the major World Cup results of a third in Lahti in the 4 × 5 km relay, and a fourth place in the 10 km classical in Rukatunturi, Finland

In January 2011 she obtained third place in the 2010-11 Tour de Ski, arriving third on the final climb finish in Val di Fiemme, following Justyna Kowalczyk and Therese Johaug. The 2011 season brought several good results in all the different disciplines, with a total of six podium positions in World Cup races, and three podium positions in Stage World Cup races.

2011 World Championships, Oslo

Longa did not compete at the starting race in the world championship, the sprint won by Marit Bjørgen. She took start at the 15 km pursuit and finished 5th, following Bjørgen, Justyna Kowalczyk, Therese Johaug and Charlotte Kalla. At the 10 km classical she finished seventh. Longa also participated at the Team Sprint, completing the Italian team together with Arianna Follis. They secured the fourth position, following in order of Sweden, Finland and Norway. In the relay 4 × 5 km relay, together with Follis, Antonella Confortola and Silvia Rupil, Longa secured the fourth position, with a start that saw her in the first place after her fraction. On the last race, the 30 km, she obtained the eight position in a spectacular day, where Johaug offered an outstanding performance securing the gold medal ahead of Bjørgen and Kowalczyk.

Olympic Games

World Championships

• 2 medals – (1 silver, 1 bronze)

World Cup

Season standings

Season	Age	Discipline standings					Ski Tour standings
		Overall	Distance	Long Distance	Middle Distance	Sprint	Nordic Opening	Tour de Ski	World Cup Final
2000	20	NC	—	—	NC	—	—	—	—
2001	21	85	—	—	—	59	—	—	—
2002	22	80	—	—	—	57	—	—	—
2003	23	51	—	—	—	—	—	—	—
2004	24	55	38	—	—	—	—	—	—
2005	25	69	45	—	—	—	—	—	—
2007	27	19	13	—	—	51	—	15	—
2008	28	34	26	—	—	51	—	—	5
2009	29	6		—	—	20	—	5	13
2010	30	9	10	—	—	26	—	8	16
2011	31	7	4	—	—	13	8		DNF

Individual podiums

• 1 victory – (1 WC)
• 9 podiums – (5 WC, 4 SWC)

No.	Season	Date	Location	Race	Level	Place
1	2008–09	17 January 2009	Whistler, Canada	7.5 km + 7.5 km Pursuit C/F	World Cup	2nd
2		30 January 2009	Rybinsk, Russia	10 km Mass Start F	World Cup	1st
3		14 February 2009	Valdidentro, Italy	10 km Individual C	World Cup	2nd
4	2009–10	9 January 2010	Val di Fiemme, Italy	10 km Mass Start C	Stage World Cup	3rd
5	2010–11	1 January 2011	Oberhof, Germany	10 km Pursuit C	Stage World Cup	3rd
6		6 January 2011	Toblach, Italy	15 km Pursuit F	Stage World Cup	3rd
7		8 January 2011	Val di Fiemme, Italy	10 km Mass Start C	Stage World Cup	3rd
8		31 December 2010 – 9 January 2011	Tour de Ski	Overall Standings	World Cup	3rd
9		4 February 2011	Rybinsk, Russia	5 km + 5 km Pursuit C/F	World Cup	2nd

Team podiums

• 1 victory – (1 RL)
• 6 podiums – (5 RL, 1 TS)

No.	Season	Date	Location	Race	Level	Place	Teammate(s)
1	2003–04	7 February 2004	La Clusaz, France	4 × 5 km Relay C/F	World Cup	3rd	Paruzzi / Confortola / Valbusa
2	2009–10	7 March 2010	Lahti, Finland	4 × 5 km Relay C/F	World Cup	3rd	Confortola / Valbusa / Follis
3	2010–11	21 November 2010	Gällivare, Sweden	4 × 5 km Relay C/F	World Cup	3rd	Genuin / Rupil / Follis
4		19 December 2010	La Clusaz, France	4 × 5 km Relay C/F	World Cup	2nd	De Martin Topranin / Rupil / Follis
5		16 January 2011	Liberec, Czech Republic	6 × 1.3 km Team Sprint C	World Cup	2nd	Genuin
6		6 February 2011	Rybinsk, Russia	4 × 5 km Relay C/F	World Cup	1st	Genuin / Rupil / Follis