Cheap flights from Washington to San Juan from $126 DCA, IAD → SJU
Ronald Reagan National Airport (DCA), Washington Dulles International Airport (IAD) → Luis Munoz Marin International Airport (SJU)
The cheapest return found recently is $223 with Frontier Airlines, 11 Dec – 18 Dec, found today. The cheapest one-way found recently is $126 with Frontier Airlines, 1 Jan 2027, found 4 days ago.
- Cheapest one-way found recently
- $126, found 4 days ago
- Cheapest return found recently
- $223, 11 Dec to 18 Dec
- Usual return price
- $386 to $451
- Cheapest month to fly
- December 2026, return fares from $223 found in the last 7 days
- Airlines with nonstop flights
- Frontier Airlines, United Airlines, jetBlue
Return
The cheapest return fare on each of 5 departure dates is usually $386 to $451.
Cheapest return found recently
$223
11 Dec – 18 Dec · Frontier Airlines
Washington Dulles International Airport (IAD) → Luis Munoz Marin International Airport (SJU)
Leaves 8:26 p.m. · Return leaves 8:40 a.m. · 17 h 14 min of travel, both ways together
out 1 stop, back nonstop
found today
Cheapest nonstop return
$666
1 Jan 2027 – 4 Jan 2027 · Frontier Airlines
Washington Dulles International Airport (IAD) → Luis Munoz Marin International Airport (SJU)
Leaves 12:38 p.m. · Return leaves 12:43 p.m. · 7 h 52 min of travel, both ways together
out nonstop, back nonstop
found 4 days ago
Found recently, and the cheapest we hold
$223 11 Dec – 18 Decfound todaySee prices for these dates
It is also the cheapest return we hold, of any age.
What have prices looked like?
Over 46 days, 24 Sept to 12 Nov, the cheapest return we saw each day was $162 to $451.
Those were the prices on those days, not today's.
Is this a good return price?
Compared with the cheapest return fare on each of 5 departure dates from 11 Dec to 12 Feb 2027, found by travelers' searches in the last 7 days (economy, the price the seller showed on Aviasales). The usual range is the middle half of those prices.
Could nearby dates be cheaper?
We hold no other 7-night return fares leaving within 3 days of 11 Dec to compare.
Every date we hold
65 fares on 5 departure dates
See the chart as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 11 Dec – 18 Dec | $223 | Frontier Airlines | Washington Dulles International Airport (IAD) → Luis Munoz Marin International Airport (SJU) | out 1 stop, back nonstop | found today | See prices for these dates |
| 18 Dec – 18 Dec | $542 | American Airlines | Ronald Reagan National Airport (DCA) → Luis Munoz Marin International Airport (SJU) | out 1 stop, back 1 stop | found today | See prices for these dates |
| 30 Dec – 6 Jan 2027 | $386 | Frontier Airlines | Washington Dulles International Airport (IAD) → Luis Munoz Marin International Airport (SJU) | out 1 stop, back 2 stops | found 7 days ago | See prices for these dates |
| 1 Jan 2027 – 4 Jan 2027 | $451 | jetBlue | Ronald Reagan National Airport (DCA) → Luis Munoz Marin International Airport (SJU) | out 1 stop, back 1 stop | found 4 days ago | See prices for these dates |
| 12 Feb 2027 – 19 Feb 2027 | $407 | United Airlines | Ronald Reagan National Airport (DCA) → Luis Munoz Marin International Airport (SJU) | out 1 stop, back 1 stop | found 4 days ago | See prices for these dates |
Which month looks cheapest?
December 2026 is the cheapest month — from $223.
Airlines on the cheapest dates: Frontier Airlines, American Airlines, jetBlue, United Airlines.
One-way
Not enough comparable prices yet for a usual one-way price.
Cheapest one-way found recently
$126
1 Jan 2027 · Frontier Airlines
Washington Dulles International Airport (IAD) → Luis Munoz Marin International Airport (SJU)
Leaves 5:35 a.m. · 8 h 13 min trip
1 stop
found 4 days ago
Cheapest nonstop one-way
None seen yet.
Found recently, and the cheapest we hold
$126 1 Jan 2027found 4 days agoOpen this trip
It is also the cheapest one-way we hold, of any age.
What have prices looked like?
Over 25 days, 24 Sept to 12 Nov, the cheapest one-way we saw each day was $106 to $318.
25 days is a short history, so treat this range as an early guide.
Those were the prices on those days, not today's.
Is this a good one-way price?
Not enough comparable prices yet: we hold one-way fares on 1 departure date and need at least 3 to say what is usual.
Could nearby dates be cheaper?
We hold no other one-way fares leaving within 3 days of 1 Jan 2027 to compare.
Every date we hold
2 fares on 1 departure dates
See every date as a table
| Dates | From | Airline | Airports | Stops | Found | |
|---|---|---|---|---|---|---|
| 1 Jan 2027 | $126 | Frontier Airlines | Washington Dulles International Airport (IAD) → Luis Munoz Marin International Airport (SJU) | 1 stop | found 4 days ago | Open this trip |
Airlines on the cheapest dates: Frontier Airlines.
Premium cabin fares from Washington to San Juan
We hold no premium economy, business or first-class fares for this route: we collect them for the busiest routes, and this one is not among them yet.
Today's prices for 11 Dec – 18 Dec in another cabin: Premium economy · Business · First
Today's prices for 1 Jan 2027 in another cabin: Premium economy · Business · First
How far ahead were prices cheapest for Washington to San Juan?
Return
Fares 14 to 29 days before departure were typically 23% lower than 0 to 6 days before departure.
From the cheapest return each day between 24 Sept and 12 Nov (46 days), grouped by how many days ahead the flight left; one adult in economy.
Each range covers different departure dates, so this compares typical fares, not the same trip priced twice.
Prices reflect recent searches — current fares may differ.
See these ranges as a table
| Booked ahead by | Typical fare | Cheapest day | Above the cheapest | Days of prices |
|---|---|---|---|---|
| 0–6 days | $275 | $254 | +30% | 15 |
| 7–13 days | $232 | $162 | +9% | 22 |
| 14–29 days | $212 | $162 | Cheapest seen | 26 |
| 30–59 days | $213 | $189 | +0% | 28 |
| 60–89 days | $354 | $302 | +67% | 19 |
| 90–179 days | $482 | $407 | +127% | 10 |
One-way
The cheapest fares were 0 to 6 days before departure.
From the cheapest one-way each day between 24 Sept and 12 Nov (25 days), grouped by how many days ahead the flight left; one adult in economy.
Each range covers different departure dates, so this compares typical fares, not the same trip priced twice.
Prices reflect recent searches — current fares may differ.
See these ranges as a table
| Booked ahead by | Typical fare | Cheapest day | Above the cheapest | Days of prices |
|---|---|---|---|---|
| 0–6 days | $142 | $130 | Cheapest seen | 7 |
| 30–59 days | $318 | $126 | +124% | 12 |
| 60–89 days | $208 | $156 | +46% | 8 |
Could a nearby airport be cheaper?
A different airport at either end can change the fare — sometimes a lot.
Return
Baltimore → San Juan
57 km from Washington
$188
$35 less than flying from Washington
4 Feb 2027 – 7 Feb 2027 · BWI → SJU · out 1 stop, back nonstop
found 19 hours ago
Cheapest recent price on each route — round trip, per traveler in Economy. Distances are in a straight line.
One-way
Baltimore → San Juan
57 km from Washington
$126
The same price as flying from Washington
1 Jan 2027 · BWI → SJU · 1 stop
found 4 days ago
Cheapest recent price on each route — one way, per traveler in Economy. Distances are in a straight line.
Live price for these dates
The cheapest return found recently is for 11 Dec – 18 Dec. A live search on this page shows what those dates cost now, for one adult in economy.
Questions about this trip
How much is a return flight from Washington to San Juan?
The cheapest return found recently is $223 with Frontier Airlines, 11 Dec to 18 Dec, found today. The cheapest return fare on each of 5 departure dates is usually $386 to $451.
How much is a one-way flight from Washington to San Juan?
The cheapest one-way found recently is $126 with Frontier Airlines, 1 Jan 2027, found 4 days ago.
What is the cheapest month to fly from Washington to San Juan?
December 2026 is the cheapest month for a return, from $223, 11 Dec to 18 Dec, found today.
How far ahead should I book a flight from Washington to San Juan?
In 46 days of prices between 24 Sept and 12 Nov, return fares 14 to 29 days before departure were typically 23% lower than 0 to 6 days before departure. In 25 days of prices between 24 Sept and 12 Nov, one-way fares were cheapest 0 to 6 days before departure.
Is there a direct flight from Washington to San Juan?
Yes, the cheapest nonstop return found recently is $666 with Frontier Airlines, 1 Jan 2027 to 4 Jan 2027, found 4 days ago.
How long is the flight from Washington to San Juan?
The cheapest one-way found recently, with Frontier Airlines on 1 Jan 2027, takes 8 h 13 min with 1 stop.
Which airlines have the cheapest flights from Washington to San Juan?
Between 11 Dec and 12 Feb 2027, Frontier Airlines has the cheapest return on 2 of the 5 departure dates we hold, American Airlines on 1 and jetBlue on 1.
Prices are what travelers' searches on Aviasales found in the last 7 days, in US dollars: the price the seller showed on Aviasales; bags may cost extra. Fares change, so check today's price before you book. How our prices work