Flights St Louis → Shannon
As of November 2026, economy flights from St Louis to Shannon have a typical range USD 848–1323, median USD 1027. Full range across all 109 offers: USD 754–12339. We analyzed 109 offers from 11 airlines in a single price check.
Preview snapshot — prices change. Search for live results.
Data collected by LetsFG's multi-source price checks — every airline and the major booking sites checked for this route. How we collect data →
Best offers by airline: St Louis → Shannon
Based on 109 offers · November 2026. Prices and availability change — run a live search to confirm.
Bag & seat fees: St Louis → Shannon
Add-on pricing from the cheapest available offer per airline · November 2026 · USD
| Airline | Carry-on | Checked bag | Seat selection |
|---|---|---|---|
| United Airlines | Included | USD 150 | — |
| Iberia | Included | Included | — |
| British Airways | Included | Included | — |
| American Airlines | Included | USD 143 | — |
| Finnair | Included | Included | — |
| Aer Lingus | Included | Included | — |
| Air Canada | Included | Included | — |
Fees are estimates from the prices we checked and may not reflect your specific itinerary, booking class, or payment method. Run a live search for exact pricing.
How much do flights from St Louis to Shannon cost?
Based on 109 offers · November 2026
St Louis to Shannon flights ranged from USD 754 to USD 12339 across 109 offers analyzed in November 2026. The chart below shows how prices distributed across all 109 offers.
These 109 offers (November 2026) span multiple departure dates and booking windows — your travel dates may fall anywhere in this distribution. Only a live search shows where your specific trip lands.
50% of offers priced between USD 1005 and USD 1088
What hidden fees do St Louis to Shannon flights charge?
Ancillary fees — bags, seat selection, and payment surcharges — can add 10–25% to the base fare on St Louis to Shannon routes. The breakdown below is based on 109 offers analyzed in November 2026.
| Carrier | Avg fee (USD) | % of base fare |
|---|---|---|
| UA | 75 | 3% |
| IB | 12 | 1% |
| BA | 39 | 3% |
| AA | 63 | 6% |
| AY | 34 | 3% |
| EI | 8 | 1% |
| AC | 12 | 1% |
United Airlines: base ~USD 863 + fees USD 75 = ~USD 938 total. Aer Lingus: base ~USD 1063 + fees USD 8 = ~USD 1071 total.
United Airlines's USD 75 ancillary fees narrow the gap with Aer Lingus's lower-fee model — the USD 200 base difference shrinks to USD 133 after fees. Always compare total cost, not just the advertised base fare.
Estimates based on median total minus average ancillary fee. Actual base fares vary by itinerary.Fee levels vary significantly across carriers on this route — some carriers charge 50%+ above the base fare in ancillary fees.
Run your search to see itemized fees for your itineraryWhich airline is cheapest from St Louis to Shannon?
11 airlines flew St Louis to Shannon in this dataset. Knowing the airline isn't enough — the typical fare range below shows how far prices swing on each one. Median and range include all fees we recorded.
Even on the cheapest airline (United), fares ranged USD 765–1032 in this snapshot. Your exact price depends on your dates and how far ahead you book — run a live search to see your number →
| Airline | Offers | Typical range (USD) | Median (USD) | Fees (USD) |
|---|---|---|---|---|
 United | 10 | 765–1032 | 848 | n/a |
 United Airlines | 34 | 792–10186 | 938 | 75 (8%) |
 Iberia | 3 | 1005–1097 | 1005 | 12 (1%) |
 British Airways | 7 | 1007–1019 | 1008 | n/a |
 American Airlines | 6 | 1012–1030 | 1021 | 63 (6%) |
 American | 10 | 1012–1035 | 1021 | n/a |
 Air Canada | 3 | 1016–1022 | 1021 | n/a |
 Aer Lingus | 3 | 1063–1071 | 1071 | 8 (1%) |
 Finnair | 5 | 1043–1853 | 1088 | 34 (3%) |
 British Airways | 27 | 1050–1351 | 1099 | 39 (4%) |
 Air Canada | 1 | — | 1252 | 12 (1%) |
Where do the best St Louis → Shannon prices come from?
We checked direct airlines, travel agencies, and meta-search for this route. On this route the lowest median came from meta-search sources, but the cheapest channel shifts by route and date — which is exactly why a live search across all of them wins.
We compare every airline and the major booking sites but never disclose which — that's our edge. Prices are the ones we observed and aren't official data from any platform. Run a live search and we bring you the cheapest, wherever it is.
Key facts: St Louis to Shannon flights
- St Louis–Shannon had 109 offers analyzed. Median price: USD 1027.
- UA charges 9.4x more in ancillary fees than EI — USD 75 vs USD 8 avg per booking.
- The same route priced USD 193 apart depending on where it was booked — the lowest median was USD 938. We search every airline and the major booking sites at once so you always see that lowest price.
Frequently asked questions
- How much does a flight from St Louis to Shannon cost?
- Based on 109 offers analyzed, St Louis to Shannon flights range from USD 754 to USD 12339, with a median price of USD 1027. Search for your specific dates →
- What hidden fees should I expect on St Louis to Shannon flights?
- On average, ancillary fees (bags, seat selection) add USD 54 to the base fare on St Louis to Shannon flights. See itemized fees for your itinerary →
- Which airline is cheapest on St Louis to Shannon including all fees?
- United has the lowest median fare on St Louis to Shannon at USD 848 (median across 10 offers in our snapshot). Check which airline wins on your dates →
- Which booking site has the cheapest St Louis–Shannon flights?
- It depends on your dates — no single site is always cheapest. We search every airline and the major booking sites at once (travel agencies and meta-search included) and surface whichever is lowest; the best median in this snapshot was USD 938. Run a live search and we'll find the cheapest for you →
- Why do prices vary so much on St Louis to Shannon routes?
- St Louis to Shannon has 11 airlines competing, creating a price range from USD 754 to USD 12339 across 109 offers. Prices on this route change with booking timing, advance purchase, and ancillary add-ons. Find where your trip lands in the distribution →
11 airlines compete on this route — we check every one
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