Washington Dulles International ⇄ San Jose IAD–SJO
Airlines flew 179 flights between Washington Dulles International IAD in Washington, DC and San Jose, Costa Rica SJO in San Jose, CR in the twelve months to July 2026, both directions together: 23,501 passengers in 30,973 seats, 76% of them filled, and 1,937 pounds of freight. 2,037 miles, about 120 minutes in the air, on 2 airlines: Lacsa (95), United Air Lines Inc. (84).
Flights by month both directions
By month, as a table
| flights | |
|---|---|
| 1/25 | 37 |
| 2/25 | 12 |
| 3/25 | 21 |
| 4/25 | 16 |
| 6/25 | 34 |
| 7/25 | 38 |
| 8/25 | 27 |
| 11/25 | 11 |
| 12/25 | 48 |
| 1/26 | 44 |
| 2/26 | 13 |
| 3/26 | 18 |
| 4/26 | 16 |
| 5/26 | 1 |
| 7/26 | 1 |
Passengers by month
By month, as a table
| passengers | |
|---|---|
| 1/25 | 5,050 |
| 2/25 | 1,618 |
| 3/25 | 3,244 |
| 4/25 | 2,337 |
| 6/25 | 3,885 |
| 7/25 | 5,451 |
| 8/25 | 3,075 |
| 11/25 | 1,573 |
| 12/25 | 5,850 |
| 1/26 | 5,537 |
| 2/26 | 2,040 |
| 3/26 | 2,749 |
| 4/26 | 2,377 |
| 5/26 | 155 |
| 7/26 | 145 |
The airlines twelve months, both directions
| Airline | Flights | Passengers | Seats filled | Service |
|---|---|---|---|---|
| Lacsa LR | 95 | 10,650 | 63% | scheduled passenger service |
| United Air Lines Inc. UA | 84 | 12,851 | 92% | scheduled passenger service |
The aircraft as the airlines report their types
| Aircraft | Flights | Seats a flight | Passengers |
|---|---|---|---|
| Boeing B737 Max 800 | 83 | 166 | 12,674 |
| Airbus Industrie A320-100/200 | 65 | 179 | 7,239 |
| Airbus Industrie A320-200n | 30 | 180 | 3,411 |
| Boeing B737 Max 900 | 1 | 179 | 177 |
IAD → SJO this direction alone · flown January 2025 to April 2026
88 flights of 40 scheduled, 11,056 passengers in 15,224 seats, 1,543 pounds of freight. Lacsa 48; United Air Lines Inc. 40.
SJO → IAD this direction alone · flown January 2025 to July 2026
91 flights of 40 scheduled, 12,445 passengers in 15,749 seats, 394 pounds of freight. Lacsa 47; United Air Lines Inc. 44.
Source: the Bureau of Transportation Statistics' T-100 Segment table (all carriers). A flight is one departure performed on this segment; seats and passengers are the airlines' own monthly reports; "seats filled" is passengers divided by seats. The miles are the DOT's great-circle distance. Both ends: Washington Dulles International IAD and San Jose, Costa Rica SJO; all routes.