Your next trip, last seen at €75
Lowest observedFrontier Airlines · 1 stop · One wayWhen to fly
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The lowest fare we observed for each month. Open a month to see its days, then pick your outbound and return. A day with no price is one we will search for you.
- Lowest observed
- €75, departing 2 Dec 2026 (Last checked: 11 Oct 2026)One-way fare · Priced departure days checked in the last 14 days: 118Check live prices for this route
- Airlines seen
- Frontier Airlines, JetBlue, United Airlines
- Typical journey time
- 13h 56m
About this route
Explore the fares we observed from San Juan to St Louis. Prices move often, so pick your dates to see the latest options.
- Route distance
- 3,231 km
- Typical journey time
- 13h 56m
- Airlines seen
- Frontier Airlines, JetBlue, United Airlines
- Seen on fares with a connection
- Frontier Airlines, United Airlines, JetBlue
- Alternative airports
- SIG, SUS
Route-level information; individual journeys vary.
We have not observed non-stop service on this route; the fares shown include at least one stop.
A clearer picture of your fare
Airport to city: straight-line distance
- Fernando Luis Ribas Dominicci Airport (SIG) → San Juan, city gazetteer reference point (18.4663, -66.1057): ≈ 1 km.
- Luis Munoz Marin International Airport (SJU) → San Juan, city gazetteer reference point (18.4663, -66.1057): ≈ 11 km.
- St. Louis Lambert International Airport (STL) → St Louis, city gazetteer reference point (38.6270, -90.1994): ≈ 20 km.
Approximate distances calculated from coordinates, not road distances or travel times. These airports serve the city; they are not confirmed endpoints of an offer.
Lowest fare by departure month
Cheapest month from San Juan to St Louis: December 2026, from €75 (checked 11 Oct 2026).
| Month | Lowest fare | Priced days |
|---|---|---|
| October 2026 | €97 | 19 |
| November 2026 | €81 | 29 |
| December 2026 | €75 | 31 |
| January 2027 | €184 | 29 |
| February 2027 | €187 | 10 |
Lowest fare by day of the week
Cheapest day of the week from San Juan to St Louis: Wednesday, from €75 (checked 11 Oct 2026).
| Day | Lowest fare | Priced days |
|---|---|---|
| Monday | €115 | 16 |
| Tuesday | €76 | 17 |
| Wednesday | €75 | 18 |
| Thursday | €81 | 17 |
| Friday | €80 | 17 |
| Saturday | €187 | 17 |
| Sunday | €153 | 16 |
One-way fares checked in the last 14 days. Each figure is the lowest priced departure day we saw, not a guaranteed fare.
Lowest fare by days before departure
Lowest fare from San Juan to St Louis by days until departure (31 to 60 days): €75 (checked 11 Oct 2026).
| Days before departure | Lowest fare | Priced days |
|---|---|---|
| 0 to 7 days | €278 | 7 |
| 8 to 30 days | €97 | 23 |
| 31 to 60 days | €75 | 29 |
| 61 days or more | €76 | 59 |
One-way fares checked in the last 14 days. Each figure is the lowest stored fare for that distance to departure, not a price forecast.
Fares for different departure dates, checked now; not a guide to when to book.
Lowest one-way fare we saw per airline
Cheapest airline from San Juan to St Louis: Frontier Airlines, from €75 (checked 11 Oct 2026).
| Airline | Lowest fare | Priced days |
|---|---|---|
| Frontier Airlines | €75Dec 2, 2026 | 77 |
| United Airlines | €231Nov 19, 2026 | 38 |
| JetBlue | €248Oct 27, 2026 | 3 |
One-way fares checked in the last 14 days. An airline listed here had a fare on at least 3 departure days. Each figure is the lowest we saw, not a guaranteed fare. Connecting itineraries are included; the date is the departure day of that fare.
Frequently asked
How much is a flight from San Juan to St Louis?
The lowest fare we have observed is €75, found on 11 Oct 2026. Prices move, so read it as a floor rather than a quote.
When is the cheapest month to fly from San Juan to St Louis?
Cheapest month from San Juan to St Louis: December 2026, from €75 (checked 11 Oct 2026).
Are there direct flights from San Juan to St Louis?
Our data holds no non-stop flight from San Juan to St Louis. The fares on this page include at least one stop.
Which airlines fly from San Juan to St Louis?
These are the carriers we have seen on the route: Frontier Airlines, JetBlue, United Airlines.
How long does the flight from San Juan to St Louis take?
The average journey time across the 118 fares we observed is 15h 42m, including any stops. Individual departures vary; the fastest observed flight is listed in the route facts above.
How many of the observed San Juan to St Louis fares were non-stop?
None of the 118 fares we observed was non-stop; every one included at least one stop. That describes our observations, not every flight that operates.
Which day of the week is cheapest from San Juan to St Louis?
Cheapest day of the week from San Juan to St Louis: Wednesday, from €75 (checked 11 Oct 2026).
Which airline has the lowest fare from San Juan to St Louis?
Cheapest airline from San Juan to St Louis: Frontier Airlines, from €75 (checked 11 Oct 2026).
How observed prices work, what "No data" means and what a fare includes: Read the flight price guide
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Recently observed fares. Prices may change.
Last checked: 11 Oct 2026