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Flights between Dulles (IAD) and San José (Alajuela) (SJO)

Washington Dulles International Airport, United States ↔ Juan Santamaría International Airport, Costa Rica

A direct route between Dulles and San José (Alajuela) appears in the OpenFlights route network.

Confirming who flies IAD–SJO

We're verifying which airlines currently operate IAD–SJO. Current operators will appear here as our data refreshes.

Distance
3,288 km
2,043 miles
Est. flight time
4h 37m
great-circle estimate
Time difference
~1h
varies with DST
View this route on the live map →Search fares on Skyscanner ↗

Climate

Typical monthly temperatures in United States

Jan
4°
9/-1
70mm
Feb
6°
11/1
60mm
Mar
11°
16/6
75mm
Apr
17°
22/12
80mm
May
23°
28/18
95mm
Jun
28°
33/23
100mm
Jul
30°
35/25
95mm
Aug
29°
34/24
90mm
Sep
25°
30/20
80mm
Oct
18°
23/13
70mm
Nov
11°
16/6
70mm
Dec
5°
10/0
75mm

Mean °C (high/low below), avg. rainfall mm · country-level monthly normals, not airport-specific.

Typical monthly temperatures in Costa Rica

Jan
28°
33/23
10mm
Feb
29°
34/24
5mm
Mar
30°
35/25
15mm
Apr
30°
35/25
80mm
May
29°
34/24
250mm
Jun
28°
33/23
280mm
Jul
28°
33/23
200mm
Aug
28°
33/23
230mm
Sep
28°
33/23
320mm
Oct
28°
33/23
350mm
Nov
28°
33/23
145mm
Dec
28°
33/23
30mm

Mean °C (high/low below), avg. rainfall mm · country-level monthly normals, not airport-specific.

Travel advisories

United States: Normal precautions (UK FCDO) ↗Costa Rica: Normal precautions (UK FCDO) ↗

Common questions

How far is Dulles from San José (Alajuela)?

Dulles (IAD) and San José (Alajuela) (SJO) are around 3,288 km (2,043 miles) apart — an estimated 4h 37m by air. Distances and flight times are great-circle estimates.

What is the time difference between Dulles and San José (Alajuela)?

Time difference ~ 1 hour (varies with daylight-saving).

When is it warmest in Costa Rica?

Across Costa Rica, the warmest month on average is March, with mean temperatures around 30°C. These are country-level monthly climate normals, not airport-specific.

Are there travel advisories for United States and Costa Rica?

The UK FCDO currently rates United States as Normal precautions; The UK FCDO rates Costa Rica as Normal precautions. Check the official sources before you travel.

Distances and flight times are great-circle estimates, not booked block times.