Need help booking?
Unpublished phone-only deals available
ROI to STL: distance & flight time
Roi Et (Roi Et Airport) → St. Louis (St Louis Lambert International Airport)
8,537 mi
13,739 km · 7,419 nm
17h 12m
estimated nonstop flight time
-13h
time difference · heading north
See live ROI→STL fares Phone-only fares on this route — call free
Flight time details
8,537 miles nonstop takes roughly 17h 12m gate to gate, flying north. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 13-hour time set-back when reading arrival times on your ticket.
The two airports
- ROI — Roi Et Airport · Roi Et, Thailand
- STL — St Louis Lambert International Airport · St. Louis, United States
Distances are great-circle ("as the crow flies") — the same basis airlines use for frequent-flyer miles.
Alternate airports can cut this fare
Flying from or into a nearby airport is the #1 trick our agents use to beat online prices. Call and we'll compare every combination on one call.
Near ROI
- KKC · Khon Kaen Airport70 mi away
- BFV · Buri Ram Airport70 mi away
- ZVK · Savannakhet Airport72 mi away
- SNO · Sakon Nakhon Airport78 mi away
Near STL
- SUS · Spirit of St Louis Airport16 mi away
- ALN · St Louis Regional Airport20 mi away
- BLV · Scott AFB/Midamerica Airport32 mi away
- SPI · Abraham Lincoln Capital Airport84 mi away
Frequently asked questions
How far is ROI from STL?
The flight distance from Roi Et (ROI) to St. Louis (STL) is 8,537 miles (13,739 km, 7,419 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from ROI to STL?
A nonstop flight takes about 17h 12m gate to gate. Actual time varies with winds, routing and season — eastbound transatlantic flights, for example, are usually faster than the return.
Are there nonstop flights from ROI to STL?
Nonstop service on ROI–STL depends on the season and the day of week. Run the fare search on this page with the nonstop filter applied to see current direct options; when there is no nonstop, a single connection through a carrier hub adds roughly 2–4 hours to the 17h 12m nonstop estimate.
What is the time difference between Roi Et and St. Louis?
St. Louis is 13 hours behind Roi Et.
What is the cheapest way to fly from ROI to STL?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on ROI–STL that never appear on search engines, with no booking fees.
Why are some ROI to STL fares phone-only?
Consolidator contracts let us sell certain ROI–STL tickets below the price airlines permit us to publish online, so those fares can only be quoted over the phone. Call the travel desk and an agent will check phone-only inventory for your dates.