Earn point on your loyalty program!arrow arc left

Cheap flights from St Louis (STL) to Ulaanbaatar (ULN)

Know your dates, get live prices in seconds
airplane logo

pin logo

calendar
Departure
calendar backward
Return
airplane logo
1 Adults (11+)
0 Children (2~11)
0 Infants (0~2)
Save up to 31%
Book Flight + Hotel at the same time

How to find the cheapest flight from St Louis (STL) to Ulaanbaatar (ULN)

How to find the cheapest flight from St Louis (STL) to Ulaanbaatar (ULN)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.
How to find the cheapest flight from St Louis (STL) to Ulaanbaatar (ULN)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.
How to find the cheapest flight from St Louis (STL) to Ulaanbaatar (ULN)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.

Cheap flights from St Louis to Ulaanbaatar in October , November 2026

26 Oct - 24 Nov $ 1,562.00
STL
St Louis
Frontier Airlines
3 STOPS
ULN
Ulaanbaatar
ULN
Ulaanbaatar
Frontier Airlines
3 STOPS
STL
St Louis
Pick dates
24 Oct - 06 Nov $ 2,587.00
STL
St Louis
Alaska Airlines
2 STOPS
ULN
Ulaanbaatar
ULN
Ulaanbaatar
Alaska Airlines
2 STOPS
STL
St Louis
Pick dates
20 Oct - 06 Nov $ 2,916.00
STL
St Louis
Alaska Airlines
2 STOPS
ULN
Ulaanbaatar
ULN
Ulaanbaatar
Alaska Airlines
2 STOPS
STL
St Louis
Pick dates

Last minute flights from St Louis to Ulaanbaatar

26 Oct - 01 Nov $ 1,777.00
STL
St Louis
Alaska Airlines
3 STOPS
ULN
Ulaanbaatar
ULN
Ulaanbaatar
Alaska Airlines
3 STOPS
STL
St Louis
Pick dates
26 Oct - 01 Nov $ 1,883.00
STL
St Louis
Frontier Airlines
3 STOPS
ULN
Ulaanbaatar
ULN
Ulaanbaatar
Frontier Airlines
3 STOPS
STL
St Louis
Pick dates
26 Oct - 01 Nov $ 1,933.00
STL
St Louis
Air Canada
3 STOPS
ULN
Ulaanbaatar
ULN
Ulaanbaatar
Air Canada
3 STOPS
STL
St Louis
Pick dates

One-way flights to Ulaanbaatar from St Louis

1:30 PM - 7:45 AM
Korean Air
3 Stops
31h 55m
STL - ULN
$ 780
Kiwi
Pick dates
1:06 PM - 8:30 PM
Cathay Pacific
2 Stops
47h 4m
STL - ULN
$ 1,389
Kiwi
Pick dates
2:56 PM - 1:35 PM
MIAT Mongolian Airlines
2 Stops
24h 49m
STL - ULN
$ 5,051
Kiwi
Pick dates

How to find the cheapest flight from St Louis (STL) to Ulaanbaatar (ULN)

Related info for your journey
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.
How to find the cheapest flight from St Louis (STL) to Ulaanbaatar (ULN)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.
How to find the cheapest flight from St Louis (STL) to Ulaanbaatar (ULN)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.