Cheap Flights from Porto to St Louis
No deal from Porto to St Louis has cleared our price bar yet. What we have seen on the route is below.
Across 4 months of observations from Porto to St Louis, the lowest round-trip fare we recorded was $954, in October. The typical fare was $1164. October was the cheapest month we saw and July the dearest.
The most recent price we saw on this route was $955 on Lufthansa and United, seen Oct 15. It is an unverified observation and may have changed.
See every deal <a href="/from/porto">from Porto</a>, <a href="/to/st-louis">to St Louis</a>, or the return direction <a href="/from/st-louis/to/porto">St Louis to Porto</a>.
Latest price we saw: Porto to St Louis
The most recent round-trip fare our sweep found on this route. It is not verified and may have changed since the date shown.
| From | Price | Per mile | Travel dates | Airline | Seen | Check price |
|---|---|---|---|---|---|---|
| Porto (OPO) to St Louis (STL) | $955 | 11.5¢ | Dec 6 – Dec 14 | Lufthansa and United | Oct 15 | Check price |
Price history: Porto to St Louis
What we observed by month, from our signals database. Unverified observations, not bookable prices.
| Month | Low | Typical | Sightings |
|---|---|---|---|
| Oct 2026 | $954 | $955 | 4 |
| Sep 2026 | $962 | $962 | 2 |
| Aug 2026 | $967 | $1221 | 8 |
| Jul 2026 | $1517 | $1517 | 1 |
Frequently asked questions
How many flight deals from Porto to St Louis are on Sparkflights right now?
There are 0 verified deals from Porto to St Louis on the board right now. The list refreshes hourly.
What is the lowest price ever seen from Porto to St Louis?
The lowest fare we've recorded from Porto to St Louis is $954, based on 15 price observations over 4 months.
How much does a flight from Porto to St Louis cost?
The typical round-trip fare we observed from Porto to St Louis is $1164, against a recorded low of $954. These are observations, not quotes.
When is the cheapest month to fly Porto to St Louis?
October was the cheapest month we observed from Porto to St Louis and July the dearest, over 4 months of data.
What is the current price from Porto to St Louis?
The most recent fare our sweep saw from Porto to St Louis is $955, on Oct 15. It is an unverified observation rather than a verified deal, so check it before booking.